Fat burner supplements often promise to “melt away” pounds and help you “effortlessly” lose weight. Claims surrounding fat burners tend to be controversial; the ingredients and safety questionable at best. That said, some fat burner supplements may offer small benefits to your weight and fat loss efforts when combined with an appropriate diet and exercise program.
Though fat burner supplements might not directly eliminate fat cells as some marketing suggests, they aim to assist weight loss in various ways, though the effectiveness can vary. (1) These supplements often rely on specific ingredients that may provide modest support in your weight loss journey by:
- Increasing your metabolism
- Reducing your appetite
- Limiting fat storage in your body
To find the best fat burner supplements, we examined the ingredients used to create a thermogenic (or fat-burning) effect. (1) Besides prioritizing clinically tested ingredients in effective and safe doses, we also consider ease of ordering, value, customer experience, and expert insights.
As a registered dietitian, the safety and effectiveness of the ingredients used in fat-burning supplements is my number one concern, as unsafe ingredients or unsafe doses of otherwise safe ingredients in these types of weight-loss supplements can have dangerous side effects. In general, the best way to achieve a healthy weight and your desired body composition is to eat a healthy, balanced diet, exercise frequently, and work with a registered dietitian and your physician if needed.
If you have a history of disordered eating, it is crucial to disguise dramatic changes to diet, exercise, and supplement regime with a trusted healthcare professional.
To evaluate your risk of an eating disorder or disordered eating, take the National Eating Disorders Association (NEDA) free assessment. For additional support, please contact the NEDA helpline at 1-800-931-2237.
Medical disclaimer: This article is intended for educational and informational purposes only. It is not intended as a substitute for medical advice. Fat burners are not regulated by the U.S. Food and Drug Administration (FDA), which means manufacturers can make claims about their products that are not supported by evidence of efficacy. For weight loss advice, contact a licensed healthcare provider.
Editor’s choice: Nutricost L-Carnitine Tartrate
Nutricost’s L-Carnitine Tartrate earns our pick for editor’s choice thanks to its third-party tested, caffeine-free, single ingredient formula that is clinically proven to enhance workout recovery and support weight loss efforts. You can read our full break-down below.
Our picks for the best fat burner
- Best natural: Nutricost L-Carnitine Tartrate
- Best non-stim: Transparent Labs Recomp Stim Free
- Best thermogenic: Kaged Clean Burn Elite
- Best for men: Hunter Burn
- Best for women: Hourglass Fit
Compare the best fat burner supplements
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| Nutricost L-Carnitine Tartrate | Transparent Labs Recomp Stim Free | Kaged Clean Burn Elite | Hunter Burn | Hourglass Fit | |
| Rating | |||||
| Cost per serving | $0.18 | $0.92 | $1.67 | $3 | $2 |
| Dosage | 1 scoop | 2 capsules | 1 scoop | 6 capsules | 4 capsules |
| Key ingredients | L-carnitine | Green tea leaf, Forslean, Paradoxine, Capsimax | Chromium, L-carnitine L-tartrate, coconut fruit water, apple cider vinegar fruit powder, L-tyrosine, InnoSlim, caffeine, guayusa, capsicum, CalotiBurn GP | Vitamin D3, konjac root extract, white kidney bean extract, l-theanine, matcha green tea, cayenne pepper | Vitamin B6, vitamin B12, chromium, zinc, vitamin B2, konjac root extract, Capsimax, Bioperine |
Best natural fat burner: Nutricost L-Carnitine Tartrate
Key product features
What you should know
Nutricost L-Carnitine Tartrate is a third-party tested powdered supplement featuring L-carnitine tartrate to help support weight loss efforts.
- L-carnitine tartrate has been clinically shown to lead to mild weight loss and enhanced recovery from exercise. (7, 8)
- The cost per serving for this supplement is incredibly low, at just $0.18 per serving.
- May work best for those who want to support a nutrition and exercise program and don’t want to swallow a handful of pills.
- While some studies show L-carnitine tartrate supplementation may reduce waist circumference, blood pressure, fasting blood glucose, and triglycerides, others found that it increases TMOA, a factor related to a higher risk of cardiovascular events like heart attack and stroke.(9, 10)
Why we like Nutricost L-Carnitine Tartrate as best natural
As a single-ingredient powder that’s third-party tested and manufactured in a GMP-complaint facility, you know exactly what you’re getting with Nutriost’s L-carnitine Tartrate. Each container has 100 servings; each serving is just one scoop (⅓ of a teaspoon).
L-carnitine is an amino acid derivative that we naturally get in our diet, mostly coming from red meat. Your body can also make L-carnitine from the amino acids lysine and methionine. It’s stored in skeletal and heart muscle and plays an important role in fatty acid oxidation and energy production. (8) Other research suggests that most healthy adults do not need to consume L-carnitine through supplements, as the liver and kidneys produce enough of it to meet daily requirements. In 1989, the Food and Nutrition Board (FNB) of the National Academies of Sciences, Engineering, and Medicine concluded that carnitine is not an essential nutrient. (9)
A 2020 review of clinical trials found that between one and three grams of L-carnitine supplementation may significantly reduce markers of metabolic syndrome, including waist circumference, fasting blood sugar, and triglycerides. (10) Another review that same year found no relationship between L-carnitine and waist circumference but did find that supplementation resulted in an average weight loss of 1.2 kilograms (2.6 pounds) more than those taking a placebo. (7)
When looking at these results, it’s important to remember that this 2.6-pound difference in weight loss is seen as statistically significant in research since the weight change is unlikely due to chance and most likely related to the testing variable. However, one’s weight loss efforts may not seem significantly different based on their body weight and weight goals.
While L-carnitine may seem beneficial for weight loss and reducing the risk of heart disease, researchers have also found a connection between prolonged L-carnitine supplementation and elevated TMAO levels, a compound that is typically related to an increased risk in heart disease, so more research in this area is needed. (11)
As a powder, this supplement is easy to swallow by mixing into any beverage, and you can easily adjust the dose to meet your needs. And as far as price is concerned, you’ll be hard-pressed to find something more affordable—it’s just $0.18 per serving.
What our experts say
“L-carnitine continues to become more and more popular these days due to its multiple benefits,” said Tran. “One of its main roles is to transport fatty acids into the cells to be processed into energy. I would recommend this supplement for individuals who are active in exercise as well as it enhances muscle recovery, improves oxygen supply to the muscles, and reduces muscle soreness—especially for individuals who incorporate weight training in their routine. It’s relatively safe and has additional benefits in regulating blood sugar and lower cholesterol.”
Specs
| Key ingredients | L-carnitine tartrate |
| Serving size | 1 scoop |
| Servings per container | 100 |
| Price per serving | $0.18 |
| Caffeine content | None |
Best non-stim fat burner: Transparent Labs Recomp Stim Free
Key product features
What you should know
Transparent Labs Recomp Stim-Free is a non-caffeinated supplement to help support weight loss and burn fat with ingredients that aid metabolism and reduce hunger.
- Transparent Labs Recomp Stim Free includes ingredients to help support metabolism while decreasing appetite—without using caffeine.
- At $0.92 per serving, this supplement is a good price compared to many fat-burning supplements on the market.
- If you prioritize exercise and eating well, this may provide a slight edge to help you meet your goals
- While this supplement includes many evidence-backed ingredients, the amounts in each dose may not be enough to notice significant effects.
Why we like Transparent Labs Recomp Stim Free as best non-stim
Transparent Labs Recomp Stim Free includes zero caffeine but has four ingredients that may support an increase in metabolism and help manage your hunger levels. Ingredients like forskolin and grains of paradise extract support increased lean body mass and decreased body fat to help you reach your body composition goals. (2) The addition of green tea extract may also help combat the effects of oxidative stress in the body due to exercise. (3)
Forskolin, extracted from the roots of the Coleus forskohlii plant, may activate various metabolic processes and enhance diet-induced thermogenesis—the energy expended while metabolizing food. (1) Recomp Stim Free uses a standardized formulation of this herbal ingredient known as ForsLean.
An early 2000s clinical study found that overweight women who took 250 milligrams of ForsLean twice daily did not lose weight, but they also didn’t gain weight. Additionally, they reported experiencing less fatigue and hunger than the placebo group. (4) A similar study on men showed more favorable results, including a significant reduction in body fat percentage. (5)
To stimulate your metabolism and help reduce overall food intake, this supplement contains Capsimax, a standardized formulation of capsaicin—the active ingredient in hot peppers. Research suggests that Capsimax can reduce daily calorie intake by up to 250 calories, potentially aiding in weight loss efforts. (6)
Transparent Labs Recomp Stim-Free is third-party tested, gluten-free, and free from GMOs, artificial flavors, and artificial colors. Each serving is just two capsules, and that each bottle has a two-month supply. At $0.92 per serving, this supplement is priced fairly.
What our experts say
We asked Angela Tran, DO, who is certified in internal medicine and obesity medicine, for her opinion on Transparent Labs’ fat burner.
“This fat burner is a great option for those who are looking for a boost in metabolism,” she notes. “It also helps with water retention, particularly in women who experience bloating symptoms around their menstrual period, and a great supplement to help curb their appetite.”
“However, this is also a good example for individuals to always look beyond the label, and look at the ingredients,” she continues. “While it is labeled as stim-free, it still contains green tea leaf extract which still contains caffeine, and those who are sensitive may still experience stimulant effects.”
Specs
| Key ingredients | Green tea extract, ForsLean, paradoxine, capsimax |
| Serving size | 2 capsules |
| Servings per container | 60 |
| Price per serving | $0.92 |
| Caffeine content | None |
Best thermogenic fat burner: Kaged Clean Burn Elite
Key product features
What you should know
Clean Burn Elite includes InnoSlim, an ingredient that supports healthy blood sugars and cholesterol levels as it burns sugars and fat for energy. (12)
- Kaged Clean Burn is Informed-Sport certified, so you can be confident that it’s free from any banned substances and includes what it claims, in the amount it claims, which is especially important for fat burner supplements that include caffeine and other stimulants.
- With multiple uses and ingredients to support weight loss and energy levels at just $1.67 per serving, Kage Clean Burn Elite is a good value compared to many other options on the market.
- You can use this as a pre-workout supplement to power through cardio workouts thanks to the 166 milligrams of caffeine.
Why we like Kaged Clean Burn Elite as best thermogenic
Kaged Clean Burn Elite is designed to support fat loss and enhance workout performance with 166 milligrams of caffeine, along with key ingredients like guayusa extract, L-carnitine, InnoSlim, capsicum, and grains of paradise.
This powdered supplement comes in two flavors—lemon drop and strawberry lemonade. It’s also third-party tested and Informed-Sport certified, ensuring it’s free from banned substances. With these rigorous tests and certifications, you can trust that it contains exactly what’s listed on the label, in the precise amounts promised.
Besides the caffeine, Clean Burn Elite is formulated to support your workout routine with guayusa extract. This combination is crafted to help provide an energy boost for your cardio sessions. Additionally, it includes L-tyrosine, guayusa, and caffeine, ingredients often associated with focus and mental alertness, to complement your exercise experience. (13, 14)
This supplement includes 400 micrograms of chromium, a mineral that plays a role in the body’s sugar metabolism. Chromium is known to support insulin in transporting sugar from the bloodstream into cells for energy. However, its impact on weight and muscle mass has not been conclusively proven by clinical studies. It’s also important to note that taking high doses of chromium over extended periods could potentially affect kidney and liver health. (15, 16) Additionally, apple cider vinegar is thought to support muscle cells’ glucose uptake, which may contribute to maintaining fasting blood sugar levels. (17)
Included in our top thermogenic fat burner is grains of paradise, a member of the ginger family, that triggers brown fat thermogenesis. However, the amount included in each dose is less than the effective amount used in studies. (2) It also feature InnoSlim, a combination of extracts from Astragalus membranaceus and Panax notoginseng. These ingredients help the body burn fat and manage blood sugar by activating certain cellular pathways. They work with proteins like AMPK and adiponectin, which play a role in how the body uses and stores energy. (12) Although InnoSlim’s developers reference self-funded studies that demonstrate the product’s effectiveness, the studies themselves are not publicly available.
At $1.67 per serving, Kage Clean Burn Elite is a good value compared to similar options on the market.
What our experts say
“This supplement is a great addition for individuals who struggle with sugar cravings or have problems with blood sugar regulation,” said Tran. “The combination of chromium and apple cider vinegar synergistically work together to help regulate blood sugar, improve carbohydrate metabolism, aid in digestion, and ultimately reduce sugar cravings to assist with a diet and exercise plan for weight loss. Additional L-carnitine and L-tyrosine uniquely enhance a special brain hormone called dopamine which provides benefits in focus, concentration, and motivation.”
Specs
| Key ingredients | Chromium, L-carnitine L-tartrate, coconut fruit water powder, apple cider vinegar fruit powder, L-tyrosine, InnoSlim, caffeine, guayusa, capsicum, grains of paradise |
| Serving size | 1 scoop |
| Servings per container | 30 |
| Price per serving | $1.67 |
| Caffeine content | 166 milligrams |
Best fat burner for men: Hunter Burn
Key product features
What you should know
Using ingredients derived from food sources and herbs, Hunter Burn claims to help the body effectively burn fat and feel less hungry.
- Hunter Burn includes naturally-derived appetite suppressants and ingredients to increase metabolism.
- AT $3 per six-capsule serving, this is one of the most expensive fat burner supplements on the market. Buying more than one month at a time from the website offers savings as high as one month free.
- It’s worth noting that this is a mild stimulant, including matcha green tea, but there is no indication of how much caffeine this adds to the supplement. Anyone sensitive to caffeine should use this product with caution.
- This supplement is not third-party tested, and while it claims to be gluten-free, there are no certifications verifying ingredient claims.
Why we like Hunter Burn as best for men
Hunter Burn combines six nutrients to help combat hunger and support fat metabolism when paired with diet and exercise. It works by ensuring your body has enough of some nutrients many people fall short on, like vitamin D, increasing focus with matcha green tea and L-theanine, supporting energy metabolism, and reducing your appetite with ingredients like cayenne pepper, white kidney bean extract, and konjac root extract.
Konjac root extract, a type of sticky fiber, can help boost feelings of fullness and reduce hunger, allowing you to feel satisfied with smaller portions. (18) White kidney bean extract, on the other hand, contains amylase inhibitors that may reduce the absorption of the carbohydrates you eat. While some studies suggest that white kidney bean extract may support mild weight loss, others have found no significant effect. (19)
The matcha tea in this product offers a boost of caffeine for added focus and energy, and this green tea extract may also help give your metabolism a small boost. Recent research has found that matcha tea may reduce post-workout fatigue while reducing inflammation and helping to prevent weight gain. (20, 21)
Each six-capsule serving of this supplement also provides 3,000 IU of vitamin D, which may help improve energy levels if you’re part of the 50 percent of the population who doesn’t get enough. (22) In addition to improving fatigue, vitamin D may also help fight inflammation and support glucose metabolism and healthy testosterone levels. (23, 24)
While all of the ingredients included in Hunter Burn are naturally sourced and are manufactured in an FDA-approved cGMP facility, the product itself is not third-party tested, and the website does not mention in-house testing or offer a certificate of analysis (COA) to verify that what the bottle says is what you’re getting. At $3 a serving, we’d like to see third-party testing or at least a COA available.
What our experts say
“This is an excellent option specifically designed for men who are active but struggle with maintaining their body composition,” said Tran. “Konjac root extract, along with white kidney bean extract are the stars of the show. They will aid in curbing hunger while enhancing carbohydrate metabolism, especially for men who need to fuel up with carbs for their exercise regimen. On the back end, the metabolic boosters—matcha green tea and cayenne pepper—will work together to help produce more effective results regarding body fat reduction.”
Specs
| Key ingredients | Vitamin D3, konjac root extract, white kidney bean extract, L-theanine, matcha green tea, cayenne pepper |
| Serving size | 6 capsules |
| Servings per container | 30 |
| Price per serving | $3.00 |
| Caffeine content | Unknown |
Best fat burner for women: Hourglass Fit
Key product features
What you should know
Hourglass Fit is a weight loss and fat-burning supplement for women that claims to curb cravings, provide energy support, and support metabolism with ingredients like Capsimax and chromium.
- Hourglass Fit includes Capsimax, a standardized formula of capsaicin, which supports metabolism, increases the amount of calories burned while resting, and suppresses appetite. (25, 26)
- At $2 a serving, this supplement is right in the middle of what you can expect to spend on a fat burner supplement.
- The formula is safe for vegans and free from common allergens such as soy, fish, shellfish, dairy, peanuts, tree nuts, wheat, and gluten.
Why we like Hourglass Fit as best for women
Hourglass Fit is a fat burner supplement formulated for women (but also appropriate for men) that includes ingredients to boost energy levels, decrease hunger, and support metabolism. Each dose includes 5-HTP, an amino acid derivative that acts as a precursor to serotonin and melatonin to help minimize food cravings, and konjac root extract to help you feel fuller during meals. (27, 28) Konjac root has an effect similar to that of a fiber-rich meal, absorbing water, increasing the physical mass of food in the digestive tract, and slowing down digestion. (29)
Hourglass Fit also includes 100 milligrams of Capsimax, which may further support appetite control and potentially increase the amount of energy burned at rest. (25, 26) However, it’s important to maintain a balanced diet that provides sufficient calories, protein, complex carbohydrates, and healthy fats. This approach helps sustain your energy levels and prevents muscle breakdown. (30)
In addition to these specialized herbs, Hourglass Fit includes a blend of vitamins and minerals to support healthy energy levels and metabolism. Vitamins B12, B6, and B2 are essential for energy production, which may help you feel more energized and enhance your workout performance. A small study from 2023 found that supplementing with vitamins B1, B2, B6, and B12 for 28 days significantly increased the time participants could run to exhaustion compared to a placebo group. (31)
Zinc and chromium may also help support a healthy metabolism and weight loss. (32) Though, a meta-analysis of 21 clinical trials found that taking 400 micrograms of chromium (an amount much higher than the 125 micrograms included in Hourglass Fit) per day for 12 weeks had a negligible impact on weight loss and body fat percentage for people who’s weight was categorized as overweight or obese. (33)
As a supplement that costs $2 per serving and requires you to remember to take it with each meal of the day, we would love to see more discussion of testing procedures and certifications, verifying that you’re getting exactly what the bottle says. One bottle of Hourglass Fit includes a 30-day supply, with instructions to take four pills a day with meals.
What our experts say
“It is quite common for women to feel defeated when it comes to weight loss, as there are many hormonal changes that occur during their menstrual period each month,” explained Tran. “This supplement is specifically designed to help manage some of the challenges women face monthly. It includes 5-HTP to help with mood changes, and the glucomannan aids in reducing cravings that are often very difficult to control. The additional B vitamins aim to boost energy.”
Specs
| Key ingredients | Vitamin B6, vitamin B12, chromium, zinc, vitamin B2, konjac root extract, Capsimax, Bioperine |
| Serving size | One capsule, four times a day |
| Servings per container | 30 |
| Price per serving | $2 |
| Caffeine content | None |
How we test supplements
We’re committed to providing product reviews you can trust, especially when it comes to supplements like fat burners. We provide genuine, impartial feedback and evaluate everything from purity to efficacy, value, and more. You can read more about how we test and score fat burner supplements here.
Efficacy—40%
Our team analyzes each CBD oil considering the form of CBD used, the clinical evidence backing its potential health benefits, synergistic ingredients, and more. Here’s what we look at to find the most effective CBD oils:
- CBD form
- Clinical evidence
- Dose efficacy
- Synergistic effects
- Proprietary blends
Safety and side effects—35%
We ensure that all of the dietary supplements we recommend are generally considered safe for healthy people to take and are not associated with serious adverse side effects or long-term health concerns.
To recommend the safest CBD oils on the market, we evaluate:
- Reported side effects
- Third-party testing
- Manufacturer accreditation
- Medication interactions
- Dangerous or inappropriate label claims
- Potentially harmful ingredients
Value—20%
Everyone’s working with a different budget, which is why we aim to include CBD oils that are both effective and affordable.
The factors we look at for this area of testing include:
- Price per serving
Customer experience—5%
A customer’s experience with a company directly impacts satisfaction, loyalty, and the likelihood of repeat purchases. We include it in our testing process because the consumer experience guides purchasing decisions.
Our factors in this rating include:
- Ease of purchase
- Shipping and returns
- Customer support
What are fat burner supplements?
Fat burner supplements are formulated with ingredients that may aid in weight loss and improve body composition by supporting metabolism, promoting thermogenesis, or reducing appetite. Some of these supplements include high-quality, evidence-backed ingredients and are thoroughly tested, which may support weight loss efforts when combined with a healthy diet and exercise. However, some fat burners can contain risky ingredients or excessive amounts of stimulants, especially if they aren’t tested for purity and potency. It’s crucial to consult with a doctor before trying any new supplements, as they can have potentially dangerous side effects on your health. (34, 34)
Potential side effects of fat burner supplements
There is no standard formula for fat burner supplements, meaning you’ll find a wide assortment of vitamins, minerals, herbs, stimulants, and other compounds in them. Besides potential medication interactions, side effects from various products used in fat burners can range from mild stomach upset and headaches to cardiac arrest or liver or kidney failure. (35)
If you’re taking a fat burner supplement that is not third-party tested, there is no way of verifying that what the bottle says is inside is actually in it. To ensure you’re getting a quality, correctly labeled supplement, make sure to choose one from a reputable brand that participates in extensive testing, preferably from a third-party lab.
FAQs
Do fat burners work?
Some fat burner supplements may support weight loss efforts when paired with diet, exercise, and other positive lifestyle factors. Taken alone, most fat burner supplements will not provide the results many brands claim they will.
Who should avoid fat burners?
If you take any medications, have any medical conditions, or are sensitive to caffeine or other stimulants, you may want to avoid fat burner supplements or discuss very carefully with your physician before taking one. Anyone with a history of disordered eating or an eating disorder should also avoid these weight loss supplements.
What is the most effective fat burner?
Effective fat burner supplements will have ingredients to improve fat metabolism, help burn fat already stored in the body, and accelerate your metabolism to burn more fat at rest and while exercising. (36) Caffeine is a potent fat-burning supplement when used in moderate amounts for safety, as it can help energy physical activity, increase the rate at which you burn calories, and increase the release of stored fat. (36)
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
Dr. Angela Tran, DO
Dr. Angela Tran, D.O. is Board-Certified in Internal Medicine and Obesity Medicine and is an active member of the American Board of Obesity Medicine Association. She has practiced in primary care since 2007, and recognized that obesity was often the root cause of many chronic medical conditions that she saw in her office including diabetes and high blood pressure.
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.
Lily Moe
Lily is a Brooklyn-based writer and editor with over seven years of experience in health media. As a former Fitness Coach, Lily’s editorial prowess has largely focused on fitness, nutrition, and weight management. She has also spent a fair share of time in testing labs, analyzing everything from protein powders to yoga mats. Her work has appeared in Verywell Fit, Verywell Mind, Health, and more.
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.
Kelsey Kunik
Media Dietician
About Author
Kelsey Kunik is a registered dietitian with 5+ years of experience writing SEO nutrition and wellness content. She writes editorial and commerce content for several national online publications, such as Eat This!, Healthline, Livestrong.com, and Clean Plates, and have been featured as a nutrition expert in hundreds of published articles in top-tier outlets.
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