Pre-workout supplements have gained popularity for their ability to boost energy, enhance performance, and improve focus during workouts. Today’s formulas go beyond just an energy kick, offering benefits like increased strength, endurance, and faster recovery, making them appealing to a wide range of fitness enthusiasts. Transparent Labs has developed a full line of PreSeries pre-workouts tailored to different goals, whether you’re aiming to build muscle, burn fat, or maximize muscle pumps with or without stimulants.
Our team of fitness and nutrition experts evaluated the entire Transparent Labs PreSeries lineup, reviewing each product for its ingredient quality, dosage effectiveness, safety, and price per serving. We also compared them to similar products on the market to help you understand how Transparent Labs stacks up. Read on for our in-depth analysis to determine which Transparent Labs pre-workout might be best for your fitness goals.
Medical disclaimer: This article is intended for educational and informational purposes only. It is not intended as a substitute for medical advice. For health advice, contact a licensed healthcare provider.
Transparent Labs pre-workout supplements
- Transparent Labs Bulk
- Transparent Labs Bulk Black
- Transparent Labs Stim-Free
- Transparent Labs Lean
- Transparent Labs Pump
Compare Transparent Labs pre-workouts
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| Transparent Labs Bulk | Transparent Labs Bulk Black | Transparent Labs Stim-Free | Transparent Labs Lean | Transparent Labs Pump | |
| Rating | |||||
| Cost per serving | $1.67 | $1.83 | $1.67 | $1.67 | $1.67 |
| Caffeine dosage | 200 mg | 275-325 mg | 0 mg | 180 mg | 0 mg |
| Flavors | 8 | 4 | 8 | 1 | |
Transparent Labs Bulk
Key product features
What you should know
Transparent Labs Bulk is a comprehensive pre-workout designed to enhance both physical and mental performance with clinically-dosed ingredients. The wide variety of flavors caters to different taste preferences, adding to its appeal.
- The high dose of L-citrulline malate at 8,000 milligrams (mg) is impressive, offering significant support for blood flow and muscle pumps. (1)
- At $1.67 per serving, it’s priced competitively for a premium pre-workout, especially given the quality of ingredients. However, Bulk is priced much higher than budget-friendly options on the market.
- Perfect for individuals looking for a pre-workout that boosts both endurance and focus during challenging training sessions.
Transparent Labs Bulk overview
Transparent Labs Bulk is a pre-workout supplement specifically designed to support muscle growth, strength, and endurance during workouts. The formula includes several clinically researched ingredients, each included at doses intended to maximize performance.
The 8,000 mg of L-citrulline malate helps enhance nitric oxide production and improve blood flow for better muscle pumps. (1) This is higher than the clinically effective dose of 6,000 mg used in most studies with positive outcomes. (2)
The 4,000 mg of beta-alanine meets clinical standards and helps buffer lactic acid and delay muscle fatigue during intense exercise. (3) Beta-alanine can cause paresthesia, or skin tingling, which some people may not enjoy.
BetaPure™ betaine anhydrous, included at 2,500 mg, may support strength, power output, and muscle endurance. (4)
L-tyrosine, included at 1,000 mg, might aid in mental focus and stress resilience by supporting neurotransmitter production. (5) AlphaSize® alpha-GPC, present at 300 mg, may enhance cognitive function and boost power output, though this dosage is slightly below the 600 mg often used in studies. (6) PurCaf® organic caffeine delivers 200 mg of caffeine per serving, providing a moderate energy boost equivalent to about two cups of coffee, while 200 mg of L-theanine helps to smooth out the stimulating effects of caffeine, promoting calm focus without the jitters. (7,8)
Theobromine, found in chocolate and included at 50 mg, offers a mild, sustained energy boost and supports mood, complementing the caffeine content. (9) BioPerine®, a black pepper extract, is included at 5 mg to enhance nutrient absorption, ensuring that the body fully utilizes the active ingredients in the formula. (10)
With flavors like strawberry lemonade, blue raspberry, peach mango, tropical punch, watermelon, strawberry kiwi, sour grape, black cherry, and pineapple coconut, Transparent Labs Bulk caters to a variety of taste preferences.
A 30-serving tub of Transparent Labs Bulk is priced at $49.99, which breaks down to about $1.67 per serving. Given the quality and dosage of the ingredients, this pricing is competitive for a premium pre-workout supplement. Additionally, Transparent Labs offers a subscription option with a 10% discount and free shipping, making it more affordable for regular users.
Transparent Labs Bulk is also third-party tested through Informed Choice, ensuring the product is free from banned substances and that the label accurately reflects its contents. This commitment to transparency and quality gives consumers confidence in the product’s safety and efficacy.
What customers are saying
On Amazon, Transparent Labs Bulk has earned 4.3 out of 5 stars based on 254 global ratings. Customers regularly comment on the quality and effectiveness of this supplement.
“The [blue raspberry] taste was great! It gave me plenty of energy to get going early in the morning. Of all the products I’ve tried, this one is the best bang for buck.”
Weston Deaton, Amazon
Another Amazon customer, Scott Fray Jr., writes, “This is the best pre I’ve tried. Not too much caffeine, perfect amount of beta (alanine), all around just feel great during my workouts.”
However, not everyone is a fan of the taste.
Jonathan Laliberte writes, “The Transparent Labs pre-workout is the best performing by a mile…I’m getting good energy, laser focus, a pump like never before, and sustained intensity throughout my entire workout. That being said, the strawberry kiwi tastes absolutely awful to me.”
We’ve featured Transparent Labs Bulk in:
Who Transparent Labs Bulk is recommended for:
- Athletes seeking a well-rounded pre-workout with high doses of clinically backed ingredients.
- Individuals looking to enhance both physical performance and mental focus during workouts.
- Those who prefer third-party tested supplements for safety and transparency.
- Fitness enthusiasts who enjoy a variety of flavor options in their pre-workout supplements.
Who Transparent Labs Bulk is not recommended for:
- Individuals sensitive to stimulants like caffeine.
- People working out late in the day, as the caffeine content may interfere with sleep.
- Those who may be uncomfortable with the tingling sensation caused by beta-alanine.
- People seeking a budget-friendly pre-workout, as Bulk is priced slightly higher than some competitors.
Expert opinion
“This blend packs a punch with a good amount of caffeine as a stimulant as well as top doses in other recovery supplements, such as beta alanine and l-citrulline. This mix is great for those who like the pump and max recovery options,” says Victoria Burgess, Ph.D., CSCS, CISSN, a strength and conditioning specialist and certified sports nutritionist.
Specs
| Key ingredients | L-citrulline malate, beta-alanine, betaine anhydrous, taurine, L-tyrosine, alpha-GPC, organic caffeine, L-theanine, theobromine, black pepper extract, boron citrate, vitamin B6, vitamin B12, zinc |
| Flavors | Strawberry lemonade, blue raspberry, peach mango, tropical punch, watermelon, strawberry kiwi, sour grape, black cherry, pineapple coconut |
| Price per serving | $1.67 |
| Number of servings | 30 |
| Serving size | 1 scoop (20.5-21.4 g) |
| Caffeine per serving | 200 mg |
| Third-party tested | Informed Choice |
Transparent Labs Bulk Black
Key product features
What you should know
Transparent Labs Bulk Black is a stronger formula than the original Bulk pre-workout and is designed for those who need maximum strength and mental focus during their workouts. Here’s what you should know:
- The inclusion of Infinergy™ Di-caffeine malate provides slow-release caffeine and helps prevent the energy crash often associated with high-caffeine pre-workouts.
- Priced at about $1.83 per serving, it’s on the higher end for a pre-workout supplement.
- Ideal for experienced lifters and athletes seeking a high-intensity pre-workout that offers both physical and mental performance boosts.
Transparent Labs Bulk Black overview
Transparent Labs Bulk Black is the strongest pre-workout in the PreSeries, designed to help you push your limits in both strength and mental focus. This formula is all about higher doses of key ingredients, and it sticks to a clean label with no artificial flavors or fillers.
Each serving of Bulk Black packs 275 to 325 mg of natural caffeine, giving you a solid boost to delay fatigue and keep your performance high during intense workouts. On top of that, Bulk Black includes 75 mg of Infinergy™, a patented blend of caffeine and malic acid. This is said to help extend the effects of caffeine, keeping your energy up without the usual post-workout crash or jitters. (7) The recommended daily limit for caffeine consumption is 400 mg for most people, however for athletic performance, doses much higher than that have been shown to be effective.
The formula also features 2.5 grams (g) of BetaPure betaine anhydrous, which research shows can help you crank out more reps by improving muscular endurance. (4) The 4 g of beta-alanine included are at the ideal dose for buffering lactic acid, so you can keep pushing through even as your muscles start to fatigue. (3)
With 8,000 mg of citrulline malate, Bulk Black supports nitric oxide production, improving blood flow and nutrient delivery to your muscles. This isn’t just another pre-workout relying on L-arginine; citrulline malate has proven more effective for enhancing nitric oxide levels. (1)
A 30-serving tub of Transparent Labs Bulk Black costs $54.99, which is roughly $1.83 per serving. It’s a bit pricier than some other options, but with high-quality ingredients and third-party testing for banned substances, it’s a solid investment if you’re serious about your workouts. Plus, with flavors like blue raspberry, strawberry mango, peach mango, sour gummy, black cherry, cherry kiwi, blueberry pomegranate, and watermelon peach, you’re sure to find a taste you’ll enjoy.
What customers are saying
Transparent Labs Bulk Black has earned a 4.1 out of 5-star rating on Amazon, based on 166 global ratings. Customers appreciate the clean ingredients and effectiveness of this supplement.
“I have tried probably 30-40 different types of pre-workouts over the years. This tends to give the most stable feeling affects. I also appreciate that the ingredients are all properly dosed to what the clinical trials suggest for performance. It was worth the additional $15 or so over competing brands.”
Matthew, Amazon
Many customers who purchased the black cherry flavor found the taste off-putting.
“While the pre-workout is very effective and cleaner than most others on the market, the black cherry flavor is bad,” writes an Amazon customer named Trent.
We’ve featured Transparent Labs Bulk Black in:
Who Transparent Labs Bulk Black is recommended for:
- Athletes and fitness enthusiasts seeking a pre-workout with potent doses to maximize strength and endurance.
- Individuals who require sustained energy and mental focus during intense training sessions.
- Those who prefer a supplement with a transparent label and no artificial ingredients.
- Users who want a pre-workout that has been third-party tested for purity and banned substances.
Who Transparent Labs Bulk Black is not recommended for:
- Individuals who are sensitive to high levels of caffeine or stimulants.
- Those who may find the tingling sensation from beta-alanine uncomfortable or distracting.
- People who work out late in the day and are concerned about potential sleep disruption due to the caffeine content.
- Budget-conscious consumers looking for a more cost-effective pre-workout option.
Expert opinion
“Similar to the ‘Bulk’ blend, this blend is supercharged on the caffeine side. For those who need a little extra stimulant, this would be the ideal choice,” says Burgess.
Specs
| Key ingredients | L-citrulline malate, beta-alanine, betaine anhydrous, taurine, L-tyrosine, alpha-GPC, organic caffeine, L-theanine, theobromine, Di-caffeine malate, black pepper fruit extract, boron citrate, vitamin B6, vitamin B12, zinc |
| Flavors | Blue raspberry, strawberry mango, peach mango, sour gummy, black cherry, cherry kiwi, blueberry pomegranate, watermelon peach |
| Price per serving | $1.83 |
| Number of servings | 30 |
| Serving size | 1 scoop (21-21.4 g) |
| Caffeine per serving | 275-325 mg |
| Third-party tested | Informed Choice |
Transparent Labs Stim-Free
Key product features
What you should know
Transparent Labs Stim-Free is a pre-workout that boosts performance and focus without relying on stimulants. Here’s what you need to know:
- The clinically-dosed ingredients like citrulline malate and beta-alanine may offer significant benefits for endurance and high-intensity performance.
- At $1.67 per serving, it’s priced slightly higher than other stim-free pre-workouts, but you can stretch the servings by starting with a half-scoop.
- This pre-workout is ideal for serious athletes or bodybuilders who are sensitive to stimulants or who work out at night and want to avoid caffeine.
Transparent Labs Stim-Free overview
Transparent Labs PreSeries Stim-Free is a pre-workout designed to enhance exercise performance, muscle growth, energy, and focus without relying on stimulants like caffeine. Its formula includes clinically-dosed ingredients such as citrulline malate, beta-alanine, betaine anhydrous, and L-tyrosine, making it a solid choice for those looking to avoid stimulants but still get a performance and recovery boost.
Each serving provides 8 g of citrulline malate, which plays a key role in nitric oxide production, improving blood flow and nutrient delivery to muscles. This ingredient is particularly beneficial for boosting endurance during resistance training and high-intensity workouts. (1) With 4 g of beta-alanine per serving, the formula is ideal for those focused on explosive, high-intensity movements like weightlifting and sprints. However, it’s important to note that beta-alanine needs to be taken consistently over time to maximize its effects. (3)
Betaine anhydrous is included at 2.5 g per serving, and while the evidence on its effectiveness is mixed, it may help increase overall training volume, though typically at higher doses. (4) L-tyrosine, included at 1 g per serving, and 1.3 g of taurine are added to improve mental focus and cognitive function, helping you stay sharp throughout your workout. (5)
One thing to keep in mind with this formula is the potential for tingling or itchiness from the beta-alanine, a common side effect that, while harmless, can be uncomfortable for some users.
Transparent Labs prides itself on formula transparency, listing every ingredient and its dosage clearly on the label—no proprietary blends here. Like other Transparent Labs products, the Stim-Free formula is also third-party tested through Informed Choice, ensuring that it contains no banned or harmful substances.
At $1.67 per serving, Transparent Labs Stim-Free is priced higher than average compared to other stimulant-free pre-workouts on the market. However, the company recommends starting with a half-scoop due to the product’s potency, which could extend the product’s lifespan and lower the cost per serving. Keep in mind that a half-scoop won’t provide the full clinical doses of the key ingredients, but it might be a good way to ease into the product if you’re sensitive to higher doses.
What customers are saying
On Amazon, customers have rated Transparent Labs Stim-Free pre-workout 4.2 out of 5 stars. They seem to enjoy the taste and performance of this supplement.
For example, Amazon customer Kyle writes, “Even with no caffeine, it still gives me energy and the pump.”
“Tastes great, doesn’t clump. Doesn’t upset the stomach. Gives the pump energy you need for lifting without the caffeine.”
Noel, Amazon
However, not everyone is a fan of the tingling sensation brought on by the high dose of beta-alanine. Other customers mentioned allergic reactions, stomach pain, and indigestion after taking Stim-Free.
“Although I like the cleanliness of this one, it does cause a significant amount of stomach discomfort,” writes an Amazon customer named Hayden.
We’ve featured Transparent Labs Stim-Free in:
Who Transparent Labs Stim-Free is recommended for:
- Individuals who prefer a pre-workout without caffeine or stimulants.
- Fitness enthusiasts seeking a product with clinically-dosed ingredients for endurance and muscle performance.
- Those who appreciate full transparency in ingredient labeling without hidden blends.
Who Transparent Labs Stim-Free is not recommended for:
- Individuals who rely on caffeine or stimulants for an energy boost before workouts.
- Those sensitive to the tingling sensation caused by beta-alanine.
- Budget-conscious users looking for a more affordable stimulant-free pre-workout option.
Expert opinion
“This supplement, with its lack of stimulants, can be ideal for those who can’t handle stimulants or perhaps get it from other sources (like coffee or caffeine tabs), while still boosting the performance and recovery properties,” says Burgess.
Specs
| Key ingredients | L-citrulline malate, beta-alanine, betaine anhydrous, taurine, L-tyrosine, huperzine A, black pepper fruit extract |
| Flavors | Strawberry lemonade, blue raspberry, peach mango, tropical punch |
| Price per serving | $1.67 |
| Number of servings | 30 |
| Serving size | 1 scoop (20.3-20.8 g) |
| Caffeine per serving | 0 mg |
| Third-party tested | Informed Choice |
Transparent Labs Lean
Key product features
What you should know
Transparent Labs Lean is designed to support fat loss while maintaining workout intensity and focus. The combination of caffeine and L-theanine helps deliver steady energy without the jitters or crash.
- Acetyl-L-carnitine is a standout ingredient, helping transport fat to be burned for energy, making it ideal for fat loss phases.
- At $1.67 per serving, it offers good value for a fat-burning pre-workout with high-quality, clinically dosed ingredients.
- Best for individuals looking to shed body fat while maintaining energy, endurance, and mental clarity during workouts.
Transparent Labs Lean overview
Transparent Labs Lean is a pre-workout designed for individuals aiming to cut body fat while maintaining performance during their workouts. With a clean formula that focuses on fat-burning and energy-boosting ingredients, this product is ideal for those seeking to get lean without sacrificing muscle endurance, muscle mass, or mental focus.
The formula features 6,000 mg of L-citrulline malate, which supports nitric oxide production to enhance blood flow and muscle pumps during workouts. (1)
While the 2,000 mg of beta-alanine is slightly below the typical 4,000 mg used in other Transparent Labs formulas, it may still aid in reducing muscle fatigue and improving high-intensity performance. (3) And since the dose is lower, users might experience less paresthesia as a side effect.
BetaPure betaine anhydrous, at 1,500 mg, works to support strength and endurance, helping you to push through challenging workouts. (4)
One of the key ingredients for fat loss is acetyl-L-carnitine (ALCAR), included at 1,000 mg. ALCAR plays an essential role in transporting fatty acids into the mitochondria, where they are burned for energy. This makes it particularly beneficial for individuals looking to accelerate fat burning and improve body composition. (11)
With 180 mg of PurCaf organic caffeine, Transparent Labs Lean offers a moderate energy boost, ideal for those who want sustained focus and energy without overstimulation. Paired with 180 mg of L-theanine, the caffeine is balanced out to prevent jitters and crashes, promoting a calm, focused energy throughout your workout. (7,8) Theobromine, at 50 mg, adds a mild stimulant effect and further supports mood and endurance. (9)
BioPerine (5 mg) enhances the absorption of these active ingredients, ensuring your body gets the full benefit of the formula, while huperzine A (100 micrograms) may support cognitive function and help with mental clarity and focus during fat-loss phases. (10, 12)
Priced at $49.99 for 30 servings, Transparent Labs Lean offers a solid value for those looking for a fat-burning pre-workout. Third-party testing through Informed Choice ensures safety and transparency with every ingredient clearly listed. Available in flavors like strawberry lemonade, blue raspberry, orange, tropical punch, cherry splash, sour grape, green apple, and fruit punch, there’s plenty of variety to suit different taste preferences.
What customers are saying
Transparent Labs Lean has a 3.9 out of 5-star rating on Amazon, based on 139 reviews. Customers trust the brand and appreciate the quality and effects of this pre-workout.
“This brand is the only brand I’ll buy from now on. Their products are top quality, they mix great and the texture is better than anything else I’ve tried in the recent past. I perform great in the gym and continue to feel great after.”
Weston Deaton, Amazon
Another Amazon customer named James, notes, “gives me a great pump, excellent pre-workout. I feel strong while working out, and not jittery at all.”
However, the most common complaint seems to be about the taste.
“I tried the orange flavor Lean product this morning…it was so terrible!” says Filip Milosavljevic.
We’ve featured Transparent Labs Lean in:
Who Transparent Labs Lean is recommended for:
- Individuals looking to burn fat while maintaining muscle mass and performance during workouts.
- Those who want a stimulant boost but prefer a balanced energy effect without jittery side effects.
- People focused on endurance and strength during cutting or lean phases.
- Fitness enthusiasts who value ingredient transparency and third-party testing for quality assurance.
Who Transparent Labs Lean is not recommended for:
- Individuals looking for a higher caffeine content in their pre-workout.
- Those sensitive to beta-alanine who may be uncomfortable with its tingling sensation.
- Users focused solely on muscle building rather than fat loss or cutting phases.
- Budget-conscious consumers seeking a more affordable fat-burning supplement.
Expert opinion
“This blend offers mild stimulant effects, which can help boost a workout while gaining all the benefits of the supplements that help achieve muscle recovery. The addition of L-carnitine helps to accelerate the fat loss process, which is a bonus ingredient in this specific blend. Mental focus can often suffer when in a calorie deficit, but huperzine A can help lessen that feeling,” says Burgess.
Specs
| Key ingredients | L-citrulline malate, beta-alanine, betaine anhydrous, acetyl-L-carnitine, choline bitartrate, organic caffeine, L-theanine, theobromine, huperzine A, black pepper fruit extract, zinc, copper, iodine, chromium, selenium |
| Flavors | Strawberry lemonade, blue raspberry, orange, tropical punch, cherry splash, sour grape, green apple, fruit punch |
| Price per serving | $1.67 |
| Number of servings | 30 |
| Serving size | 1 scoop (13.8-14.2 g) |
| Caffeine per serving | 180 mg |
| Third-party tested | Informed Choice |
Transparent Labs Pump
Key product features
What you should know
Transparent Labs Pump is a stimulant-free pre-workout focused on enhancing muscle pumps and endurance. The caffeine-free formula makes it perfect for late-day workouts without impacting sleep.
- The high dose of L-citrulline and arginine nitrate makes this formula stand out for delivering powerful muscle pumps and improved blood flow.
- At $1.67 per serving, it’s priced competitively for a premium stimulant-free pre-workout with high-quality, research-backed ingredients. However, it’s on the high end of the price range for the category as a whole.
- This product is best suited for exercisers focused on strength training, bodybuilding, and high-intensity workouts where muscle pumps and endurance are a priority.
Transparent Labs Pump overview
Transparent Labs Pump is a unique addition to the PreSeries line, specifically designed for those looking to enhance muscle pumps and vascularity without the need for stimulants like caffeine. Unlike other Transparent Labs pre-workouts, which focus on energy and mental clarity, Pump shifts the emphasis entirely to boosting nitric oxide levels and optimizing blood flow to muscles. This makes it an ideal option for users who want to focus on physical performance without the jittery side effects of stimulants.
At the core of the formula is 8,000 mg of L-citrulline, which is a high dose intended to maximize nitric oxide production, promoting enhanced blood flow and muscle pumps during exercise. (1) The 2,500 mg of NO3-T® arginine nitrate further supports nitric oxide synthesis, working synergistically with L-citrulline to improve endurance, nutrient delivery, and muscle performance. These two ingredients are key in giving users that sought-after “pumped” feeling during and after their workouts. (13)
BetaPure betaine anhydrous, included at 2,500 mg, helps support muscle strength and power, while Setria® L-glutathione at 250 mg is a unique addition that may assist with reducing oxidative stress and enhance muscle recovery post-workout. (4, 14) The inclusion of 500 mg of L-tyrosine helps improve mental focus, which may be beneficial for keeping you sharp during tough workouts, even in the absence of stimulants. (5)
Transparent Labs Pump is priced at $49.99 for a 30-serving tub, making it a solid choice for those focused on maximizing muscle pumps without the need for stimulants. Available in just one flavor—blue raspberry—this product is sweetened naturally with stevia extract and contains no artificial colors or sweeteners. Like other Transparent Labs products, Pump is third-party tested through Informed Choice, ensuring transparency and quality.
Who Transparent Labs Pump is recommended for:
- Individuals looking for a stimulant-free pre-workout focused on enhancing muscle pumps and blood flow.
- Strength trainers, bodybuilders, and athletes who prioritize muscle endurance and vascularity during workouts.
- People who work out later in the day and want to avoid stimulants that could interfere with sleep.
- Those who prefer a clean formula without artificial sweeteners, colors, or additives.
Who Transparent Labs Pump is not recommended for:
- Users who want a pre-workout with caffeine or other stimulants for an energy boost.
- Individuals looking for multiple flavor options, as it only comes in blue raspberry.
- Budget-conscious consumers seeking a lower-cost stimulant-free pre-workout.
- People who prefer pre-workouts that focus on both physical and mental performance enhancement.
Expert opinion
“Decreased oxidative stress and increased oxygen flow, with all the enhanced blood flow properties, are the highlights of this blend. Those who don’t want or need stimulants, but want to feel a good pump in the gym, can really benefit by using this supplement,” says Burgess.
Specs
| Key ingredients | L-citrulline, arginine nitrate, betaine anhydrous, L-glutathione, L-tyrosine, vitamin C, folate |
| Flavors | Blue raspberry |
| Price per serving | $1.67 |
| Number of servings | 30 |
| Serving size | 1 scoop (19.8 g) |
| Caffeine per serving | None |
| Third-party tested | Informed Choice |
How we test pre-workouts
Every pre-workout supplement we review is rated across nine primary categories. Each category is assigned a different percentage weight of the total score based on its relative importance when considering whether or not you should purchase a pre-workout product. Pre-workout supplements can also earn bonus credits that boost the overall rating for third-party testing credentials, sustainable packaging, the addition of antioxidants, and more.
Learn more about our pre-workout testing methodology and stim-free pre-workout testing methodology.
Ingredients for energy (stimulants)—35%
Common stimulant sources of energy in pre-workout supplements are caffeine anhydrous, PurCaf, di-caffeine malate, and theobromine. Common stimulant-free ingredients that support energy include taurine, eleuthero root, niacin, and vitamins B6 and B12. We look for effective doses of these ingredients for energy.
Non-stim ingredients—10%
Non-stimulant ingredients, such as vitamin B12, B6, or Taurine, are important because they support energy production and overall performance without relying on stimulants like caffeine. Including non-stim ingredients ensures that the supplement provides a more balanced and sustained energy boost, reducing the risk of jitters or crashes that can come with high-stimulant products. This makes it a valuable consideration for those seeking a more natural or less intense energy boost from their pre-workout supplement.
Ingredients for endurance—10%
When included in effective doses, some pre-workout formula ingredients may boost mental and physical endurance during workouts. These include beta-alanine, Carnosyn, ancient peat, and apple extract, Rhodiola rosea, L-carnitine, eleuthero root, astragalus root extract, Astragin, and Senactiv. We look for effective doses of these ingredients for endurance.
Ingredients for muscle fatigue reduction—10%
We look for pre-workout formulas with ingredients shown to reduce muscle fatigue. Specifically, we look for formulas that include citrulline malate, beta-alanine, and beetroot.
Ingredients for lean muscle support—10%
We look for 11 ingredients in effective doses that support lean muscle growth. Some of these ingredients are backed by more research than others, and they are weighted accordingly in the score for this section. The ingredients are creatine, betaine, leucine, taurine, isoleucine, valine, zinc, vitamin B, BCAAs, boron, and calcium.
Sweeteners—10%
We consider research about common sweeteners when assessing which pre-workout formulas provide the least health risks to users.
Ingredients for focus—5%
Improved focus can add to the intensity and intentionality of your workout. Many ingredients in pre-workout formulas included for focus either aren’t backed by studies or the studies show no effect. Still, we consider the inclusion and dosing of four common pre-workout ingredients in this category, though with a much smaller weight in the overall score. They include Alpha GPC, tyrosine, huperzine A, and choline bitartrate.
Ingredients for hydration—5%
Hydration plays an important role in muscle performance and recovery. We give high scores in this category to formulas that contain sodium, potassium, and/or coconut water powder (a natural source of potassium).
Cost per serving–5%
Price is a crucial factor for consumers and can often (though not always) reflect the quality of a product. There are high-quality pre-workout supplements that cost below average and low-quality ones that are more expensive. Due to this potential discrepancy, this category carries less weight in the overall score.
Transparent Labs Bulk vs Transparent Labs Lean
Transparent Labs Bulk and Transparent Labs Lean are both pre-workout supplements designed to enhance workout performance, but they cater to different fitness goals. Bulk is formulated to support muscle growth, strength, and endurance, making it ideal for individuals looking to build mass and perform at peak strength. It includes ingredients like 8,000 mg of L-citrulline malate for muscle pumps and 4,000 mg of beta-alanine for reducing muscle fatigue during high-intensity exercises. (1, 3)
On the other hand, Transparent Labs Lean is tailored for those focused on cutting fat while maintaining performance. It contains fat-burning ingredients like acetyl-L-carnitine, which helps metabolize fat for energy. (11) While it also includes L-citrulline malate and beta-alanine, the doses are slightly lower than Bulk, as Lean is more focused on providing balanced energy and endurance without sacrificing fat loss goals. Both formulas are stimulant-based, but Lean’s emphasis on fat loss makes it the better choice for those in a cutting phase.
What is bioperine, and why does Transparent Labs include it in all their pre-workouts?
BioPerine is a patented extract derived from black pepper that is commonly added to supplements to enhance the absorption of other ingredients. It increases the bioavailability of nutrients, allowing the body to absorb and utilize them more effectively. This means that even at standard doses, the ingredients in a supplement may have a more pronounced effect. (10)
Transparent Labs includes BioPerine in some of their pre-workouts to ensure that the active ingredients, such as amino acids and performance enhancers, are absorbed optimally. By improving nutrient absorption, BioPerine helps maximize the effectiveness of the formula, ensuring users get the full benefits of each ingredient.
Transparent Labs vs competitors
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| Transparent Labs Bulk | Legion Pulse | Legion Pulse Stim-Free | Naked Energy Pre-Workout | Jacked Factory Pump Surge Stim Free | Optimum Nutrition Gold Standard Pre-Workout | |
| Rating | ||||||
| Price per serving | $1.67 | $2.25 | $2.25 | $0.90 | $1.00-$2.00 | $1.10 |
| Servings per container | 30 | 20 | 20 | 50 | 15 or 30 | 30 |
| Key ingredients | Citrulline malate, beta-alanine, BetaPure (betaine anhydrous), caffeine, AlphaSize (alpha-GPC) | Caffeine, L-theanine, citrulline-malate, beta-alanine, Alpha-GPC, betaine | Citrulline malate, beta-alanine, betaine anhydrous, alpha-GPC | Beta-alanine, creatine, L-arginine, caffeine | L-citrulline, BetaPure (betaine anhydrous), glycerol, L-tyrosine, huperzine-A | L-citrulline, beta-alanine, caffeine, creatine monohydrate, L-tyrosine, AstraGin |
| Caffeine | 200 mg | 350 mg | 0 mg | 200 mg | 0 mg | 175 mg |
| Third-party tested | Informed Choice | Labdoor | Labdoor | Yes | No | Informed Choice |
When comparing the Transparent Labs PreSeries to alternatives like Legion Athletics Pulse, Naked Energy Pre-Workout, and Optimum Nutrition Gold Standard Pre-Workout, each product has its own strengths that cater to different fitness goals.
Legion Athletics Pulse offers both a caffeinated and stimulant-free version, making it a great option for users who want flexibility based on their energy needs. It’s also known for its high doses of L-citrulline and beta-alanine, making it ideal for those looking for performance boosts similar to Transparent Labs.
Naked Energy Pre-Workout is best suited for individuals looking for a clean, vegan-friendly formula that offers both pre-workout performance and essential vitamins.
Jacked Factory Pump Surge Stim Free is ideal for individuals focused on maximizing muscle pumps without caffeine, offering a strong dose of L-citrulline and Glycerpump™ for hydration and muscle fullness. However, it lacks third-party testing and includes artificial flavors.
Optimum Nutrition Gold Standard Pre-Workout is ideal for beginners or those seeking a milder pre-workout experience, offering moderate doses of caffeine, creatine, and beta-alanine for energy and endurance. Compared to Transparent Labs, it has lower doses of key ingredients but includes creatine and B vitamins, making it a good choice for those easing into pre-workouts or looking for added nutrient support.
FAQs
Is Transparent Labs Pre-Workout worth It?
Yes, Transparent Labs Pre-Workout is worth it for individuals seeking high-quality, clinically dosed ingredients and a formula that is free of artificial additives. With third-party testing for purity and banned substances, it’s a reliable option for those looking for transparency and effectiveness in their supplements.
What does Transparent Labs test its pre-workouts for?
Transparent Labs tests its pre-workouts for purity, quality, and the presence of banned substances. The company ensures that its products meet the highest standards of safety and accuracy by using third-party testing to verify that each ingredient is properly dosed and free from contaminants. This transparency allows consumers to trust that what’s listed on the label is exactly what they’re getting in each serving, with no hidden ingredients or misleading proprietary blends.
What is Informed Choice?
Informed Choice is a certification program that verifies supplements for banned substances and adherence to strict quality standards. Products certified by Informed Choice are tested for contaminants that could be harmful or banned in sports organizations, ensuring that athletes and consumers can use them without the risk of violating doping regulations. This certification provides an extra layer of trust and safety for users, particularly athletes who are subject to drug testing.
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any diseases.
Our experts
Victoria Burgess, Ph.D., CSCS, CISSN
Victoria Burgess earned her Ph.D. in Health and Human Performance from Concordia University Chicago and holds her NSCA CSCS and Certified Sports Nutritionist (CISSN). She is an adjunct professor in the Human Performance and Nutrition department at Concordia University Chicago & Parker University, where she teaches undergraduate, graduate, and doctoral-level courses.
Katrina Carter, PT, DPT, FNS
Dr. Carter has been an outpatient physical therapist since 2012 with a passion for wellness and educating patients on proper nutrition for healing. She has her Bachelors in nutrition from UConn and doctorate in physical therapy from Seton Hall. Dr. Carter is also a certified fitness nutrition specialist through the National Academy of Sports Medicine. She enjoys dance, fitness, baking, and traveling the world.
Joana Neziri, M.S., NASM CPT
Joana is a writer, editor, and content strategist focusing on nutrition, fitness, and all things health. After earning a master’s degree in business from the University of North Florida, she began a career in research and digital marketing.
Jessica Coulon
Jessica is a contributing editor and writer who specializes in fitness, health, nutrition, and science content. Previously, she was an editor for Popular Mechanics and Bicycling, where she covered pro cycling news, wrote how-to guides, and tested all the latest and greatest bike gear. She was also a regular shoe tester and contributor for Runner’s World. You can often find her skiing or riding her mountain bike, and racing with the F1RE female enduro team.
Kelly Uhler
Kelly has a multifaceted background in elder care, health care, and copywriting. She has worked for organizations such as A Place For Mom and Homecare.com, which gave her the opportunity to work closely with families, providing reliable information to help them make informed decisions about their loved one’s health, safety, and quality of life.
Melissa Boufounos
Certified Holistic Nutritionist
About Author
Melissa Boufounos is a certified holistic nutritionist, nutrition writer, and lifelong athlete in the greater Ottawa, Ontario, Canada area. She specializes in sports nutrition and works with teen hockey players and competitive obstacle course race athletes in her virtual private practice MB Performance Nutrition.