The 14 best protein powders of 2024—written and reviewed by dietitians

Why we like Transparent Labs Whey Protein Isolate as best for muscle gain

Transparent Labs Whey Protein Isolate is packed with 28 grams of protein per serving. This is an effective dose of protein for those wanting to build muscle, as 20-40 grams every three to four hours is ideal for stimulating muscle protein synthesis. (3)

Transparent Labs has built a reputation for formulating high-quality, effective products with a focus on using clean, natural ingredients. This is evident in this gluten-free protein powder supplement, which includes only whey protein powder, cocoa, natural flavors, sodium chloride (table salt), and stevia—nothing more.

Depending on flavor, Transparent Labs Whey Protein Isolate is a low-carb protein powder with just zero to three grams of carbohydrates, zero to one gram of added sugar, and zero to two grams of fat. This ensures that you receive the essential protein necessary for building lean mass without excess carbs or fats.

The remaining ingredients, like salt, stevia, and cocoa, contribute to the product’s flavor. Considering the minimal ingredients, lack of fillers, and ideal macronutrient breakdown, we rated the formulation a 5 out of 5. 

Related: The Best Protein Powders for Muscle Gain

Transparent Labs Whey Protein Isolate is available in 15 flavor options. The variety is a lot for a protein powder, though we’ve tried other brands that offer even more flavors. Still, you’ll never get bored drinking the same old protein shake day in and day out. Our product tester tried the peppermint hot chocolate flavor and rated the taste 5 out of 5 stars. He thought it tasted like real peppermint hot chocolate without the marshmallow and whipped cream toppings. 

Not only was taste a win, but the product’s solubility was also on par, earning it 5 out of 5 stars. Our tester didn’t experience any trouble mixing the powder. There wasn’t clumping or stubborn powder stuck to the bottom of the shaker bottle. 

The $2 price per serving is right on the median price point for the protein powders featured here, but higher than some competitors, so we rated it 3.5 out of 5 stars. Some customers may find the whey protein isolate, formulation, and taste worth spending a little more.

To learn more, visit our full Transparent Labs protein review.

What to consider

Since this is a whey protein formula, it won’t work for those who are dairy-free or follow a vegan diet. Some flavors contain over 200 mg of sodium per serving, which is relatively high for protein powder, and something to look out for if you’re watching your sodium intake. Tester Annabelle Johnson tried the vanilla flavor and noted the product tasted better when mixed well in milk than water. “The water leaves a thick foam layer but the milk seems to have dissolved more,” she said. “I honestly liked how the milk one tasted but [mixed in] water, it was not good at all.” You’ll also want to consider the cost—at $2 per serving, this product may not work for everyone’s budget.

What customers are saying

Customers routinely leave positive feedback on Amazon about the clean ingredient profile and excellent taste.

On the other hand, an Amazon customer with the username “Crowman” called out the chocolate peanut butter flavor in a critical review. 

“I mostly buy Optimum Nutrition protein, but bought this on a promotion. Item mixes terribly with cold water and has an overly sweet chocolate flavor. When mixed with warm-hot water you can get almost hot cocoa flavor, which is very pleasant, but I know most people don’t prefer a hot protein shake. Overall for the price point I don’t think this is a buy unless it’s on sale,” they wrote.

What our safety lab analysis showed

Our third-party lab analysis showed Transparent Labs Whey Protein Isolate did not contain unsafe levels of heavy metals, bisphenols, phthalates, or pesticides. 

Specs

Why we like Sports Research Whey Protein Isolate as best for weight loss

Sports Research Whey Protein Isolate delivers 25 grams of high-quality protein per serving, making it a fantastic meal or snack option for those aiming to lose weight while maintaining muscle. (4) Available in vanilla, chocolate, and Dutch chocolate, each flavor is naturally sweetened with stevia, so you can enjoy a treat without added sugars (which you would like to limit while trying to lose weight). It’s also perfect for blending into low-calorie, nutrient-packed smoothies—just add a scoop of powder, your favorite fruit, and a splash of liquid for a filling meal replacement shake.

All three flavors should mix well with water, but will leave a layer of foam at the top of the shaker bottle. Our tester tried the creamy vanilla flavor and preferred the texture and flavor when mixing the protein powder with milk instead of water. 

We also love the high-quality ingredients like 25 grams of whey protein, 6.9 grams of BCAAs, and 1,000 mg of leucine in this powder that make the supplement specifically formulated to boost lean muscle growth and aid in workout recovery. An eight-week study of men engaged in resistance training showed that the athletes taking whey protein supplementation had gains in muscular strength and endurance during workouts. (5)  

Whey protein isolate is well-researched. It’s been proven to help decrease soreness after exercise thanks to its amino acids. (3) With 25 grams of protein per serving, each serving of Sports Research Whey Protein Isolate can help people activate their muscles during the workout and repair exercise-induced damage by promoting healing through muscle protein synthesis, which is the process of creating new muscle protein . (3)

Our tester liked that Sports Research Whey Protein Isolate didn’t cause their stomach to hurt or any bloating—common side effects of protein powder. 

We also appreciate how Sports Research Whey Protein Isolate is non-GMO certified, which means the ingredients are not genetically engineered or modified.

Sports Research gives you two size choices when you go to purchase the protein powder. The 32.96-ounce bag costs $37.95 before any discounts. The company also offers an 80-ounce bag for $68.85, but they have a current 15% discount. 

If you’re looking for a protein powder to support your weight loss goals, check out our best protein powders for weight loss.

What to consider

This low-calorie formulation won’t work for those who want to bulk up. The whey formulation won’t work for those who follow a vegan diet, are dairy-free, or have lactose intolerance. Sports Research Whey Protein is made without sugar, but it is sweetened with stevia, which some people might not like the taste of.

What customers are saying

Approximately 1,100 reviewers on Amazon have reviewed the Sports Research Whey Protein Isolate, with many of them raving about flavor and texture. 

“This tastes great. Not grainy tasting like other protein powders I’ve tried,” wrote an Amazon customer named Cindy C. 

Another Amazon customer says this supplement is a “game changer” after her doctor recommended she start an exercise program.

But not all customers are fans and some had digestive issues. One customer, Christine S., experienced stomach cramps after the first and subsequent times she tried it. Customer service was helpful and she was pleased that Sports Research gave her a refund and she might try it again with a different flavor. 

Another tester, Ben, gave a three-star review. 

“The value per serving was a selling point and seeing other reviews about being great tasting and mixing well,” he writes. “But I don’t agree with it tasting great. It’s not horrible, but definitely not good tasting either. I won’t be buying again.”

Specs

Why we like Nutricost Organic Pea Protein as best pea

Nutricost Organic Pea Protein is our pick for the best pea protein powder, providing 20 grams of high-quality  protein for the low cost of $0.47 to $0.65 per serving, depending on which size container you purchase. This formula contains only one ingredient, organic pea protein isolate, which means it’s unflavored and free of additives. 

Nutricost Organic Pea Protein is notably iron-rich, containing 30% of the daily value per serving. This is beneficial for those following a vegetarian or vegan diet, since studies have shown that those diets come with a higher risk of iron deficiency or insufficiency. (10) This formula also provides 6% of the daily value for calcium per serving. 

But this protein powder may not be suitable for those following a low-sodium diet since it provides 10% of the daily value for sodium (or 220 milligrams) in one serving, which is higher than most other protein powders.

Nutricost’s formula uses pea protein isolate, which is typically sourced from yellow split peas. Pea protein isolate is higher quality than pea protein concentrate—also commonly used in protein powders—thanks to its lower carbohydrate and fat content and higher protein content (by weight). (11) Pea protein isolate is also more easily digestible than most other plant-based proteins, which means it’s more nutritious. (11)

Pea protein is technically a complete form of protein, containing all nine essential amino acids (EAAs), though it’s very low in the EAA called methionine. EAAs are absolutely vital for synthesizing protein in the body, and must be consumed via food since the body can’t produce them. (12) Methionine specifically helps with digestion function and reducing DNA damage, among other benefits. (13) Pea protein is also high in branched-chain amino acids (BCAAs), which help maintain and grow muscles. (14)

Nutricost Organic Pea Protein is made in a GMP-compliant facility, a standard regulated by the FDA, which helps to ensure you’re getting a pure product.

For more information, check out our in-depth Nutricost protein powder review.

What to consider

This pea protein is only available in an unflavored option, and some customers say the protein powder is better mixed into a shake and doesn’t taste good on its own. While this is considered a complete form of protein, this formulation is low in the EAA methionine. Those who have high blood pressure or are watching their sodium intake should keep in mind each serving has 220 milligrams of sodium, which is higher than you’ll see in most protein powders.

What customers are saying

Nutricost Organic Pea Protein has over 700 reviews on Amazon. Most customers like the quality of the product and how affordable it is.

“As far as pure pea protein, this is the best bang-for-your-buck,” wrote verified Amazon customer Nolan.

Reviews were mixed on the product’s taste and texture, and many customers recommend adding the protein powder to something else that’s flavored.

“This is unflavored, but that doesn’t mean it has no flavor. It tastes like peas. If you load up on fruits in a smoothie you won’t really taste it, but that means you’re introducing more sugar back into your drink. This will bother some people more than others, so it may not matter to you,” wrote Robert R.

Specs

Why we like Ritual Daily Shake as best vegan

Ritual Daily Shake is a plant-based protein supplement featuring organic ingredients that are sustainably sourced and traceable. While Ritual isn’t certified organic, this pea protein is Clean Label Project Certified and a Purity Award Product, making it our top pick for best vegan protein powder.

Ritual Daily Shake is only offered in one flavor—vanilla. It’s sweetened with monk fruit and fermented sugarcane to enhance the taste. Even so, our product tester didn’t love the flavor, rating it 3 out of 5 stars. Determined to mask the flavor, she tried it with water, juice, coffee, and chocolate milk. She noticed an off-putting aftertaste that remained regardless of the liquid mixed with it.

Although our tester didn’t love the taste, she thought solubility was on point. She noticed the powder mixed easily without clumps or floaties and rated the solubility 5 out of 5 stars.

The Clean Label Project is an organization aimed at improving food transparency and labeling to protect consumers from harmful chemicals. (15) The Clean Label Project evaluated Ritual’s Daily Shake for harmful chemicals, toxins, and contaminants and found it to be clean and pure. (15) The Purity Award has the strictest requirements and indicates Ritual takes extra steps to minimize consumer exposure to unsafe toxins.  

Each serving of Ritual Daily Shake includes 20 grams of pea protein, which is fortified with methionine to create a more complete essential amino acid profile. While pea protein contains all nine essential amino acids, it is relatively low in methionine. Ritual has added methionine to the formula to enhance its muscle-preserving potential.

In addition to its protein content, Ritual Daily Shake provides two grams of fat and three grams of fiber. Fiber is uncommon in protein supplements, but adds benefits, like preventing constipation, reducing the risk of cardiovascular disease, supporting gut health, and regulating the appetite. (16) 
Ritual Essential Protein is third-party tested by Informed Sport. The product has been rigorously tested for more than 250 banned substances, including stimulants, narcotics, and diuretics. It could be a suitable option for those who want to feel stronger and enhance longevity.

Check out our full Ritual Daily Shake review for more information.

What to consider

If you have a daily protein shake, this product might not be best for you, as there are only 15 servings per package. The Ritual Daily Shake is sweetened with stevia, which some people find to have an unpleasant taste. Additionally, some customers have complained of a poor aftertaste.

What customers are saying

Customers on Amazon provide positive feedback about the clean ingredients found in this plant-based formulation. 

“I have been using this protein powder for years and I love it so much! It tastes great and doesn’t have that chalky taste that a lot of protein powders have. As a vegan, I love that this is a complete protein so I don’t have to worry about getting in all the essential amino acids. This allows me to not have to think as hard about what I’m eating. Love this and highly recommend to everyone!” wrote a verified Amazon buyer named Sam.

“It’s pricer in comparison to some other protein powders yet, I think it’s still worth it given the quality and taste. It’s definitely my favorite protein powder on the market..” KC MCG, Amazon

However, an Amazon customer named Nancy G. found a few flaws with Daily 50+. 

“Hopeful for a clean protein powder but so dissatisfied. No vanilla flavor to speak of,” she writes. “Within 2 minutes of mixing was so thick I could barely drink it. And the topper is that it’s non- refundable.”

Specs

Why we like Ora Organic So Lean & So Clean as best organic

Ora Organic was founded with one original mission: to create the cleanest products in the supplement industry. Made from plant-based, organic ingredients at effectively studied doses, its high standards make it a solid option.

So Lean & So Clean comes in four flavors—vanilla, vanilla chai, chocolate, and unsweetened. Each serving provides 21–23 grams of organic plant-based protein from a blend of pea, rice, and quinoa, which are similar to whey in terms of strength benefits.  (17) 

The formula also includes ingredients like organic kale, broccoli, blackberry, and apple, which contribute to the protein and fiber content. Their antioxidant properties may even support muscle strength. (18) However, the product’s “Superfood & Greens Blend” doesn’t disclose the exact amounts of each of these ingredients, so the actual dosage remains unclear. Still, for those who struggle to get enough plants and vegetables in their diet, a protein powder rich in them could be a helpful alternative.

So Lean & So Clean also features digestive enzymes like amylase, lactase, and lipase, which may improve protein absorption and help reduce bloat. (19) Since many people find whey protein difficult to digest, often experiencing bloating or discomfort, they tend to turn to plant-based alternatives. (20) These options, like So Lean & So Clean, are typically easier on the digestive system and better suited for those with sensitivities.

Ora Organic gives you plenty of options for enjoying this shake. Just toss two scoops into a blender bottle with water or milk, or mix it into your favorite smoothie. For a creamier texture, you can try blending it with your go-to plant-based milk. However, tester Abigail Wood said even though she followed the directions on the package, the powder didn’t dissolve very well and had a really gritty appearance.

Unlike many protein powders, this formula is gluten- and soy-free, making it suitable for a variety of dietary needs. At 2.50 per serving, its definitely one of the more expensive options on our list. Though, its organic certification ensures high-quality, sustainably sourced ingredients, offering peace of mind for those who prioritize clean nutrition.

What to consider

 At 2.50 per serving, it’s definitely one of the more expensive options on our list. You’ll also want to consider there are only 20 servings per container. Additionally, our tester said the protein powder didn’t dissolve well and was gritty.

What customers are saying

Ora Organic So Lean & Clean currently has 3.3 out of 5 stars on Amazon out of 48 reviews.
One customer with the username “Amazon Customer” noted that he felt better after taking this shake compared to others. “I really liked this product. It took a little bit to get used to it because I was used to drinking whey protein so the taste and texture is different. It is thinner with a different aftertaste. It feels “cleaner” in my stomach somehow. I was surprised to feel full and energized after drinking this. I will continue to buy it.”

Other customers mention the bad aftertaste. “…I was so excited to receive these, as I did not see any Stevia, but unfortunately upon receiving, I see that it is listed outside of the supplement table in the ‘other ingredients’. Against my better judgement, I decided to try the vanilla and the chocolate, and OH NO are they both just bad. They do not mix well at all (small sludge) at the bottom of my mixer bottle, horrible aftertaste, and they are extremely chalky…,” notes reviewer with the username Amanda.

Specs

Why we like Jacked Factory Authentic Iso as best low-carb

With only half a gram of fat and one gram of carbs per serving, Jacked Factory Authentic Iso is all about protein. With 110 calories, 100 are from protein and only 12 are from carbohydrates, its ideal for those on a low-carb or weight-loss diet.

Each serving boasts 25 grams of whey protein isolate, which is rapidly absorbed and easily digested, making it ideal for muscle repair and recovery after an intense lifting session. (21) Because whey protein isolate is more filtered, most of the lactose and carbs have been removed, and some with lactose intolerance can easily digest and tolerate it.

Stevia, sucralose, and natural and artificial flavors contribute to the product’s customer-praised taste. While we appreciate the high-protein content and minimal formulation, the inclusion of artificial ingredients is a slight drawback, so we rated the formulation 4.5 out of 5 stars.

Jacked Factory Authentic Iso comes in nine flavors, but reviewers also rave of its smooth and satisfying taste. Vanilla Jacked Factory Authentic Iso has the perfect amount of sweetness and flavor, making it a delicious and nutritious post-workout treat. 

Some may encounter gas, bloating, and diarrhea following the consumption of sucralose, an artificial sweetener, but the majority tolerate it without issues. Its safety has undergone thorough research and evaluation by regulatory agencies, resulting in its approval for use in foods and beverages as a non-caloric sweetener. (22) 

At only $1.33 per serving, Jacked Factory Authentic Iso is much more affordable than the average price of $2.21 per serving for the protein powders recommended here.

The absence of third-party testing for Authentic Iso likely contributes to its affordable price but is disappointing for consumers who prioritize brand transparency and seek assurance that the product’s contents align precisely with what is stated on the label.

For more information, check out our full Jacked Factory protein review.

What to consider

The absence of third-party testing for Authentic Iso likely contributes to its affordable price but is disappointing for consumers who prioritize brand transparency and seek assurance that the product’s contents align precisely with what is stated on the label. The product is sweetened with stevia, which may have an unpleasant taste for some, and may even cause uncomfortable side effects like bloating and gas for others. This whey protein won’t work for vegans, those who are dairy free, or those who are sensitive to lactose.

What customers are saying

Customers on Amazon appreciate multiple aspects of this supplement, including how easily it mixes, how delicious it tastes, and how well it’s priced.

Verified Amazon customer Keisha tried other flavors, but prefers vanilla. “Its smooth without using a blender. With milk it tastes like really good melted vanilla ice cream, even better with a little ice added! Still upset about the money I blew on the first order though. 5 stars for the vanilla.”

While most customers have been satisfied with the taste, an Amazon reviewer named Maria S. expressed disappointment in her 3-star review. 

“I don’t know how I feel about this powder. It is really good…for the first few bites/sips. About halfway through you realize there is a bit of that sweetener taste. Currently using it stirred into my oatmeal. Tried it mixed with some unsweetened vanilla feeding tube formula, and it was a little too sweet to just drink through a straw.”

Specs

Why we like Kaged Protein Isolate Elite as best for men

With a combination of fast- and slow-digesting proteins, Kaged Protein Isolate Elite is ideal for men looking for a protein powder that supports muscle building and recovery immediately following a workout and long after. Every serving offers 15 grams of whey protein isolate, five grams of micellar casein isolate, and five grams of milk protein isolate, totaling 25 grams of high-quality protein. 

Whey protein is a fast-absorbing protein that offers a quick dose of amino acids for post-workout muscle repair and growth. It’s estimated that about 10 grams of whey protein is absorbed each hour. (23) Micellar casein protein powder is a slow-digesting protein that some prefer to take before bed because it provides a slow drip of amino acids to muscles over several hours for potentially improved muscle recovery. (24) Milk protein isolate is a combination of whey and casein, thereby bolstering the whey and casein protein in every serving.

As you may have noticed, all protein sources are in isolate form, meaning the majority of fat, lactose, and carbs have been removed. This results in the Kaged Protein Isolate Elite having low fat and carb content, specifically 1.5 grams of fat and three grams of carbs.

Kaged Protein Isolate Elite contains MAXCatalyst, a patented ingredient derived from black pepper extract, that may improve the absorption of nutrients, including amino acids, so they can make it to your muscles. 

The product is sweetened with steviol glycosides and sucralose. However, our testers love how Kaged whey protein never tastes of artificial sweeteners. Though relatively low in fat with 1.5 grams per serving, it has added MCT oil, which can cause stomach issues like abdominal pain, gas, or diarrhea.  (25)

Kaged Protein Isolate Elite comes in traditional chocolate and vanilla flavors, as well as cookies and cream. It’s Informed Sport Certified, free of banned substances, and created for athletes looking for a quality protein powder to support their goals. 

Despite having a unique formulation, Kaged Protein Isolate Elite falls within the average market price for protein powders at $1.88 serving.

What to consider

Kaged Protein Isolate Elite is sweetened with sucralose, an artificial sweetener that some may not like the taste of or experience unwanted side effects, like gas and bloating. “It’ll get the job done, but if you’re looking for a more neutral-tasting protein powder, this is not for you,” said tester Lily Moe.

What customers are saying

Over on Amazon, customers mention the quality of ingredients, solubility, and value as the best features of Kaged Protein Isolate Elite.

However, verified Amazon buyer Daniel N. took issue with the taste.

“The flavor is good but they REALLY overdid it with the sweetness,” he writes. “You must have a sweet tooth or something to tone it down to stand it.”

Specs

Why we like Cellucor Cor-Performance Whey as best cheap

Cellucor Cor-Performance Whey strikes a balance between affordability and quality, making it a standout option for budget-conscious fitness enthusiasts. Each tub contains 70 servings and runs for $69.99 on the website. At just $1 per serving, it’s one of the most cost-effective whey isolate protein powders on the market.  

Each serving provides 24 grams of protein from a combination of whey isolate and whey concentrate, which offers both rapid absorption and sustained release of amino acids. (26 , 27) Whey isolate is particularly beneficial for those looking to limit their calories, as it is highly filtered to remove most fats and carbs, while whey concentrate might provide a slightly broader range of nutrients, including small amounts of healthy fats and carbohydrates that may aid in energy replenishment after workouts. (28) 

Together, this whey blend may help maximize muscle repair and growth, making it an ideal choice for supporting your protein needs. Though, there is no solid evidence that either one is better than the other in terms of muscular strength or physical performance benefits. (29) 

Additionally, this formula is low in sugar and gluten-free. Cor-Performance also features digestive enzymes protease, protease A-S, and lactase to improve protein digestion and absorption, ensuring your body gets the most out of each serving. (30)

Flavors like molten chocolate and whipped vanilla have earned rave reviews for their smooth, rich taste. Users consistently note how well it mixes with water or milk, with no clumping or gritty texture, making it an easy, convenient option for shakes or smoothies.

On the downside, it’s worth noting that Cellucor Cor-Performance Whey Isolate contains artificial ingredients like sucralose, acesulfame potassium, and xanthan gum, which may not appeal to those seeking a more natural product. Additionally, it includes allergens like milk, peanut, and soy, and is processed on equipment that handles egg and wheat, which could be a concern for those with allergies or sensitivities.

Cellucor Cor-Performance Whey offers a solid blend of whey proteins, low sugar content, and a price point that’s hard to beat, making it a strong choice for those looking for a beginner high-quality protein at a low cost.

What to consider

It’s worth noting that Cellucor Cor-Performance Whey Isolate contains artificial ingredients like sucralose, acesulfame potassium, and xanthan gum, which may not appeal to those seeking a more natural product. Additionally, it includes allergens like milk, peanut, and soy, and is processed on equipment that handles egg and wheat, which could be a concern for those with allergies or sensitivities. And, we don’t like that the exact ratio of whey isolate to whey concentrate isn’t disclosed, making it harder for those concerned about carbs and fat to know exactly what they’re getting.

What customers are saying

Cellucor Cor-Performance has 4.5 out of 5 stars on Amazon, and 636 total reviews. In addition to its affordability, many customers highlight the smooth texture and great taste as standout features.

Another reviewer with the username RevPastor3 mentioned the convenience and flavor variety:

“This brand checked all the boxes. Good flavor, easy blending, lower cholesterol, and good price point. Not the highest protein content of all the brands, but certainly sufficient. Would purchase again.”
On the flip side, some customers have raised concerns about how the product mixes. One reviewer, Zakary W., noted: “I don’t understand. If you follow the instructions you have too little liquid. If you put 16oz which is usually what I do it doesn’t mix correctly and clumps together forming little protein powder balls. If you mix it with water it’s horrendous and if you make it too hot with something to try and get it to dissolve or mix together it foams up and cooks like a brownie so if I could get some help or something. I might be doin it wrong but until then I’m giving it this rating.”

Specs

Why we like Promix Unflavored Whey Protein as best unflavored

Promix Unflavored Whey Protein is a premium choice for those seeking a pure protein without flavorings. With 25 grams of whey isolate protein per serving sourced from grass-fed cows, it offers more than just muscle support—it provides a range of natural micronutrients, including omega-3 fatty acids and CLA, which contribute to overall health. These healthy fats can aid in reducing inflammation and supporting heart health. (32, 33)

Besides the whey isolate, the only other ingredient in this formula is sunflower lectin, which is usually added to protein powder to improve blending and nutrient absorption, and there is no evidence yet that it negatively impacts gut bacteria. (34) Promix Whey Protein is free of gluten and soy, making it an excellent option for those with dietary restrictions. It also contains no added sugar, keeping the formula as clean and natural as possible.

Despite being unflavored, reviewers say this protein powder blends smoothly and easily into a variety of drinks or recipes without affecting the overall taste. For those who like to customize their protein shakes with their favorite ingredients, for example, the neutral taste of Promix Unflavored Whey Protein is a huge advantage.

What truly sets Promix apart from the competition is its commitment to product quality, and its transparency in describing it to customers. It’s third-party tested and holds an NSF Certified for Sport certification, ensuring the product meets strict safety standards and is free from contaminants, heavy metals, and banned substances. Promix’s website also displays all of its Independent Testing Lab results. For athletes or those who prioritize clean supplements, this certification offers peace of mind that you’re consuming a safe and reliable product.

Promix Whey is only $1.42 per serving; for a grass-fed isolate with only one other ingredient in the formula, we think it’s a great deal. Overall, Promix Unflavored Whey Protein delivers a potent combination of high-quality ingredients, transparency through third-party testing, and the simplicity of an unflavored, no-frills protein powder, making it the best choice for those seeking a clean, reliable protein source.

What to consider

Those who are looking for protein powder that adds flavor to shakes and smoothies might want a different option. Of course, this whey protein isn’t suitable for vegans or those who are dairy-free.

What customers are saying

Promix is well-loved on Amazon, with 4.3 out of 5 stars and 3,002 reviews. Many users appreciate the clean, neutral taste of Promix Unflavored Whey Protein, noting that it blends seamlessly into various drinks and recipes. 

“I decided to try this powder on recommendation from my daughter in law, who is a Registered Dietician and super picky about what she eats,” writes verified Amazon buyer Brooke Ekstrom. “She told me that she likes this product because of the clean ingredients and the lack of sweeteners. My previous protein powder was super sweet so I wasn’t sure if I would like this one or not, but I gave it a go. I wasn’t exactly sold after the first protein shake but I soon grew to really enjoy the less sweet protein shake. The chocolate peanut butter taste is very subtle, not overpowering and no artificial sweetener aftertaste. It’s just right! This product mixes very well in my shaker with almond milk and I like to throw in some collagen and creatine as well. I have also tried the vanilla flavor and it is just as delicious.”

On the downside, some customers, Morgan R., didn’t have the same luck with mixing: “I bought this product due to the ingredients. We have also used the unflavored. I don’t have a sensitive stomach but haven’t noticed any issues taking in one full serving per day. I have only mixed it into ice cream and shakes. I did try once to mix it in coffee but it was just clumpy and tasted terrible. I would not recommend this if you plan to throw it into a shaker cup with water or milk.”

Specs

Why we like Optimum Nutrition 100% Gold Standard Whey as best for women

Optimum Nutrition 100% Gold Standard Whey features 24 grams of quality protein that can help women reach their goals, whether they want to lose weight, add muscle, or improve strength.

Studies show that supplementing with whey protein improves body composition, lean muscle mass, and strength in women when combined with resistance training. (35, 36) It may even prevent age-related muscle loss and strength in older women, even without resistance training. (37) 

Whey protein isolate, whey protein concentrate, and hydrolyzed whey protein are combined in Optimum Nutrition’s protein powder, offering 5.5 grams of branched-chain amino acids. Whey protein isolate is 90% protein with minimal carbs and fat. Comparatively, whey protein concentrate is less filtered, contains more fat and carbs, and up to 80% protein. (6) Hydrolyzed whey protein has been partially broken down to help improve digestion and absorption. 

Our testers tried the chocolate peanut butter flavor and rated the formulation 4.5 out of 5 stars. We appreciate the macronutrient breakdown, with only four grams of carbs and two grams of fat. But we could do without the maltodextrin, a fast-absorbing carbohydrate that may quickly raise blood sugar levels. (38)

There are around 20 flavors, so you have plenty of diverse options. All flavors have slightly different ingredients. Some, but not all, contain artificial sweeteners and flavors. For instance, delicious strawberry includes artificial flavors, colors, and sweeteners, but strawberry is naturally flavored, colored, and sweetened. If you prefer to steer clear of artificial ingredients, check the ingredients list of your preferred flavor before purchasing. 

Protein content is consistent in all Optimum Nutrition’s protein powder flavors, providing  24 grams per serving. But carbs, fat, and calories vary slightly. Pick the powder that suits your tastes and has a nutrition profile that aligns with your goals. 

Our two expert testers rated the taste of chocolate peanut butter powder 4.5 out of 5 stars. One thought adding real peanut butter to your shake would be a better, less powdery option, while the other raved about the flavor.

They rated solubility 5 out of 5 stars. Our team has tested more than 100 protein powders, and we’ve found Optimum Nutrition protein always mixes well in a shaker bottle or blender. 

Each scoop costs $1.61, which is rather affordable considering the flavor options, protein content, and third-party testing. For these reasons, we rated the price per serving 4 out of 5 stars.

Check out our full Optimum Nutrition protein review for more insights.

What to consider

Some flavors contain artificial sweeteners and flavors, which may cause and overly sweet or unpleasant taste for some. And, some flavors contain maltodextrin, a processed carb that may spike blood sugar quickly.

What customers are saying

Buyers on Amazon appreciate the combination of taste, quality, and solubility, as well as the high amount of protein per serving. 

A verified Amazon buyer Carrie C. has tried many flavors and says Rocky Road is the best.

Another Amazon review written by a user named Isabelle doesn’t usually like protein powders, but says this one is delicious. 

“This is awesome, I normally avoid protein powders and supplements in general but I realized it’s nice to have this as a backup for days I’m really not that hungry but still need more protein or for days I simply don’t have the time. It does make me feel more full…”

While Optimum Nutrition earns praise for many of its flavors, not all customers like the taste.

“Way too sweet for me,” writes verified Amazon customer Rachel about the vanilla ice cream flavored protein powder.

What our safety lab analysis showed

Our third-party lab analysis showed Optimum Nutrition 100% Gold Standard Whey did not contain unsafe levels of heavy metals, bisphenols, phthalates, or pesticides.

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Why we like Momentous Collagen Peptides as best collagen

Collagen is the most abundant protein in the human body, accounting for approximately 30% of the body’s total protein. (39) It creates the structure for ligaments, tendons, skin, and muscle connective tissue. As we age, our bodies’ natural collagen production declines. This makes products like Momentous Collagen Peptides a desirable supplement. 

Momentous Collagen Peptides provides 11.6 grams of collagen peptides from grass-fed bovine and 5.2 grams of FORTIGEL collagen hydrolysate, for a total of 16.8 grams of collagen per serving. Collagen can’t be absorbed in its full form, so it’s broken down into peptides for easy digestion. There are 29 different types of collagen known to science, but Momentous Collagen Peptides consist of types I, II, and III. (40) Type I provides structure to skin, bones, tendons, and ligaments. Type III is found in connective tissues, bones, and skin. (39) 

Collagen peptides may help with joint health and mobility when combined with regular exercise. (41) They also may support improvements in skin hydration and elasticity and reduce the appearance of wrinkles. Some consider collagen a nutrient that makes them appear and feel younger. (42) As if that isn’t enough, some could find collagen peptides help maintain and strengthen their bones, making them less likely to fracture, especially later in life. (43) 

In addition to collagen peptides, Momentous Collagen Peptides includes vitamin C and FORTIGEL. Vitamin C promotes the natural synthesis of collagen in the body. (44) FORTIGEL is a patented ingredient containing hydrolyzed collagen broken down into smaller peptides, some of which are absorbed intact and help optimize the formation of new collagen in the body. 

The unflavored collagen supplement can be easily mixed into hot or cold beverages, including tea, water, or coffee. Our product tester rated the taste 3.5 out of 5 stars. When combined with whey protein, it wasn’t detectable at all. However, when mixed with coffee, it altered the flavor. 

She noticed some floaties when mixed in coffee, but they dissolved easily when given an extra stir. There were no clumps, and we rated solubility 4 out of 5 stars.

What to consider

These collagen peptides are made from bovine (cow) sources, so they’re not for vegans or vegetarians. Our testers found that sometimes it took some extra stirring to help dissolve all the clumps. Some people also report these collagen peptides can have a slightly noticable flavor in water or coffee.

What customers are saying

Amazon customers appreciate that this collagen protein powder dissolves well into hot liquids and that it helps support healthy hair, skin, and nails. 

Another Amazon buyer named Ron G.has found a seamless way to get more collagen into his diet using this supplement. 

“This is an easy product to add to your morning routine! Little hand mixer in a beverage and you’re ready to go. Flavor is fine and it dissolves quickly.” 

However, at least a few reviews mention issues with the taste. 

“The taste is awful and gave me horrible gas pains!” wrote a verified Amazon buyer named Dana.

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