Non-stim fat burners are supplements that may help you increase your weight management without any stimulant ingredients, like caffeine. The best fat burners can potentially help in a fat loss journey when used judiciously — and we emphasize the word ‘judiciously,’ meaning consumed alongside a calorie deficit and exercise routine.
Most fat burner products contain stimulants, like caffeine. But plenty of people are a little sensitive to these ingredients, or they want to take their pills at night without messing up their sleep. Non-stimulant fat burners are out there, but they can be harder to find. Not to worry. Using our tried-and-true supplement testing methodology, we’ve put together a list of the best non-stimulant fat burners on the market to help support your weight loss journey without any of those pesky jitters or unwanted stimulants.
The 6 Best Non-Stim Fat Burners of 2025
- Best Non-Stim Fat Burner Overall: Transparent Labs Recomp Stim-Free
- Best Non-Stim Fat Burner for Bodybuilding: Jacked Factory Lean PM
- Best Research-Backed Non-Stim Fat Burner: Legion Phoenix Stim Free
- Best L-Carnitine: 1st Phorm L-Carnitine
- Best Berberine: Bulk Supplements Berberine HCL Powder
- Best Green Tea Extract: Thorne Green Tea Extract
Editor’s note: The content on BarBend is meant to be informative in nature, but it should not be taken as medical advice. The opinions and articles on this site are not intended to diagnose, prevent, and/or treat health problems. Speak with your physician before undertaking any new weight loss regimen.
Best Overall Non-Stim Fat Burner: Transparent Labs Recomp Stim-Free
Transparent Labs Recomp Stim-Free is a fat burning supplement that's totally free of stimulants, so you can take it in the evening without staying up. Transparent Labs' ingredients are third-party tested and free of artificial ingredients, too.
Specs
- Active Ingredients: Green tea leaf extract, forslean, l-theanine, capsimax
- Price Per Serving: $0.92
- Servings Per Container: 30
- Serving Size: 2 capsules
Why We Like It
Finding the best fat burner for women or the best fat burner for men with zero stimulants can be tricky. But with its simple, yet effective ingredient list, Transparent Labs Recomp Stim-Free gets the job done — that’s why we named it the best non-stim fat burner overall.
“Recomp Stim-Free uses research-backed ingredients,” according to Chelsea Rae Bourgeois, RDN, who gave the formulation a 3.5 out of 5. “Nevertheless, that doesn’t eliminate the risks associated with fat burners. Fat burners aren’t appropriate for everyone but I appreciate that this has been tested by a third-party lab.”
One serving of this non-stim fat burner packs 50 milligrams of capsimax (red pepper extract), which may help provide a thermogenic effect, meaning it can help your body burn more calories, according to the Cleveland Clinic. Nevertheless, no single ingredient can outweigh the importance of your overall diet quality.
We also like that one serving only involves two capsules. However, the brand does recommend that you take two capsules twice daily, which can be challenging for athletes who are constantly on-the-go. For that reason, we had to give the dosage convenience a 3 out of 5.
When it comes to cost, this is a pricier fat burner than some others on this list. One 60-serving bottle costs $54.99. That amounts to about $0.92, earning Transparent Labs a 3.5 out of 5 in this category. The serving size may be less than $1 but since you do need to take two servings per day, it drives the price up.
Read our full Transparent Labs Stim-Free Fat Burner Review.
Best Non-Stim Fat Burner for Bodybuilding: Jacked Factory Lean PM
This non-stimulant fat burner includes ingredients like melatonin and l-theanine, which may be able to support improved sleep. We also like that you only need to take two capsules once a day, making it more convenient than others.
Specs
- Active Ingredients: L-theanine, green tea extract, melatonin, vitamin B6, magnesium, bioperine, cayenne pepper extract
- Price Per Serving: Starting at $0.42
- Servings Per Container: 30, 60
- Serving Size: 2 capsules
Best Research-Backed Non-Stim Fat Burner: Legion Phoenix Stim-Free
Legion's Phoenix comes with an extra absorbable form of synephrine and a high dosage of EGCG to promote its fat-burning properties. Each five-capsule serving provides 834 milligrams of Citrus Aurantium.
Specs
- Active Ingredients: 5-HTP, caralluma fimbriata, l-dopa, forskolin
- Price Per Serving: $1.67
- Servings Per Container: 30
- Serving Size: 3 capsules
Why We Like It
If you’re putting something in your body and spending your hard-earned money on a supplement, you probably want to ensure that the ingredients are backed by research. That’s why we really like Legion Phoenix Stim-Free.
“The caffeine-free version of Legion Phoenix scores a 3.75 out of 5,” according to Chelsea Rae Bourgeois, RDN. “For a fat burner, it contains an impressive list of natural ingredients with science-backed doses.”
For anyone wondering how to burn fat, this option from Legion is about as good as it gets for a product that is supported by the literature. The combination of ingredients is supported by somewhat promising peer-reviewed studies and features seven ingredients with clinically effective doses. There are ingredients meant to serve as appetite suppressants like caralluma fimbriata (1,000 milligrams) and 5-HTP (150 milligrams).
You’ll also find ingredients to potentially aid in calorie burning — 50 milligrams of forskolin, 100 milligrams of black ginger, and 153 milligrams of manuca pruriens. Phoenix is free of caffeine, so you don’t have to worry about becoming jittery or disturbing your sleep. If you want to read the research, Legion has it readily available on their website. And here’s good news for vegetarians — they’re vegetable capsules, so they’re acceptable for people avoiding animal products.
When it comes to dosage, though, we had to give this product a 3 out of 5, as it’s not the most convenient. You need to take three capsules per serving, which can be a lot of pills to take at once, especially if you’re taking other supplements.
If you won’t settle for just any fat burner and want only ingredients that are supported by the research then you will like Legion Phoenix Stim Free. Its seven clinically-dosed ingredients are supported by emerging peer-reviewed studies and priced well to boot.
Best L-Carnitine: 1st Phorm L-Carnitine
1st Phorm packs 1,500 milligrams of L-carnitine in this supplement. Unlike most other fat burners, this is actually a powder, so you can mix it with your other powdered supplements. It also has a pretty budget-friendly price per serving.
Specs
- Active Ingredients: l-carnitine, l-tartrate, green tea leaf extract, fucoxanthin
- Price Per Serving: $0.72
- Servings Per Container: 60
- Serving Size: 1 scoop
Best Berberine: Bulk Supplements Berberine HCL Powder
BulkSupplements Berberine HCL powder only has one ingredient — berberine HCL. You can buy this product in bulk sizes to save money but at only $0.21 per serving for the smallest container, we still think this one is extremely budget-friendly.
Specs
- Active Ingredients: Berberine HCl
- Price Per Serving: Starting at $0.09
- Servings Per Container: Starting at 50
- Serving Size: 500 milligrams
Best Green Tea Extract: Thorne Green Tea Extract
Thorne packs 250 milligrams of green tea extract in just one capsule of this supplement to help potentially increase your body fat burn. Our team also loves that this supplement is available on Amazon Prime for quick delivery.
Specs
- Active Ingredients: Green tea phytosome
- Price Per Serving: $0.50
- Servings Per Container: 60
- Serving Size: 1 capsule
Other Non-Stim Fat Burners We Tested
Like the best pre-workouts with creatine, non-stim fat burners can be more of a niche supplement category. That said, though, we have been able to test a handful of products beyond those listed above. Here are some of our favorites from trials that just barely missed the cut of this round-up.
- Phen24 Night: We like Phen24’s nighttime formula thanks to its robust ingredients list which includes 200 milligrams of l-theanine, an amino acid linked to improved thermogenesis of “white” stored fat cells, as well as 5-HTP from Griffonia simplicifolia seed extract for boosted serotonin release and increased satiety through the night. (5)(6) However, you cannot purchase the PM formulation outright, meaning you’ll need to drop roughly $85 for a weight loss bundle that’s only halfway useful if you’re trying to avoid stimulant ingredients.
- Legion Forge Pre-Workout Fat Burner: Another Legion Athletics fat burner, Forge keeps things simple with three ingredients to support stubborn fat loss, support muscle growth, and increase metabolic rate. Legion Forge also utilizes 125 milligrams of yohimbine bark extract, which studies show can have a positive effect on mean weight loss when practicing a low-energy diet. (7) However, the capsule count per serving sits at four pills per dose — a definite turnoff for pill-averse athletes wanting a lower count than Legion Phoenix Stim-Free.
How We Tested and Chose the Best Non-Stim Fat Burners
When selecting the best non-stim fat burners for this list, our team applied BarBend‘s supplement testing methodology to consider a number of factors, including ingredients and dosing in testing roughly 18 different products. Fat burners are not a crucial supplement to consider when building your supplement stack and for some athletes, they’re not suitable at all. But if you want to give them a try, we’re here to help you make the most educated (and effective) purchase. We rated these picks on a scale of 1 (lowest) to 5 (highest) in categories such as those listed below:
- Listed Ingredients: In addition to looking at formulations forgoing caffeine or stimulants from common sources like black or green coffee, we also ensured that the compounds included in each makeup lent themselves to supporting your weight loss journey. We prioritized ingredients shown to regulate thermogenesis and body temperature, as well as those influencing satiety and metabolic rate. Some examples include cayenne pepper extract, green tea leaf extract, l-theanine, and l-carnitine.
- Dosage: Although some fat burners may have solid ingredients, it doesn’t matter if the dosage is lower than what’s clinically effective. Our team looked closely at ingredients but also the amount of each ingredient that’s provided.
- Proprietary Blends: When fat burners have proprietary blends, it’s hard to know how much of each ingredient you’re getting. Our team favored non-stim fat burners that rely on precise and transparent information over options with proprietary blends.
- Price: Some fat burners can be extremely pricey, as they contain more ingredients and higher doses. Yet, that may not fit into everyone’s budget. So, we made a conscious effort to provide variety.
- Third-Party Testing: We tried our best to prioritize third-party tested products. This helps ensure that the supplement actually reflects what’s on the ingredient label.
The Benefits of Non-Stim Fat Burners
While there are many potential benefits to supplementing with a fat burner, non-stim fat burners offer their own unique benefits. Whether you’re looking to increase thermogenesis, improve fat oxidation, boost metabolism, decrease appetite, or just avoid the poor sleep that may occur when you take stimulants, we detail each potential benefit below.
- Decreased Appetite: Although counting macros for weight loss can be a good strategy, a supplement that may help decrease your appetite can be a helpful tool, as well. Of course, though, keeping a tally of your daily carbs, fats, and proteins is a more informative means to ensuring your calorie deficit is on the right track rather than relying on an additional supplement for support.
- Non-Stimulant: There are many potential benefits to choosing the non-stim route, and it may be the best choice for you if you enjoy getting your stimulants from a caffeine source like coffee beans. Stimulant-free fat burners can also be worthwhile if you need to combine your supplementation with any current medications that may or may not contain added stimulants, as well.
- Increased Dietary Thermogenesis: A thermogenic fat burner may increase thermogenesis, and therefore, potentially increase calories burned. This includes energy expenditure from ingesting, digesting, and processing the food we eat. (2)
- Increased Fat Oxidation: Fat oxidation is the process that breaks down fatty acid stores in the body (triglycerides). In order for the body to target fat metabolism over other types of energy, you need to work out at moderate intensity (or 45-65% VO2max) endurance training that lasts less than 2 hours or longer. (1) Fat oxidation may also be supported by some fat-burning supplements.
The Cons of Using Non-Stim Fat Burners
When taken correctly, non-stim fat burners can be a helpful tool in supporting your best weight loss program. That said, though, there are inherent negatives that can be associated with the category.
- Lack of Energy Support: For one, you won’t get the same energy boost from these powders and capsules as you would their stim-rich brethren. This could be a detriment to those needing extra energy when trying to work and train through a calorie deficit.
- May Miss Out on Essential Nutrients: Chelsea Rae Bourgeois, registered dietitian nutritionist and our expert reviewer, also notes that non-stim fat burners designed as appetite suppressants may leave you depleted in other nutrient categories. “It’s important to listen to and honor your hunger cues when pursuing sustainable weight loss and blocking nutrient absorption puts you at risk for long-term complications,” she advises.
- Should Be Used As Part of a Balanced Plan: It’s also important to remember that non-stim fat burners aren’t magical elixirs that automatically generate fat loss. “There is no magic pill for weight loss,” Bourgeois states, emphasizing the need to balance training, nutrition, and supplementation correctly when tackling this particular fitness goal.
What to Avoid in Non-Stim Fat Burners
As with the best pre-workout supplements, sometimes, even non-stim fat burners can contain ingredients you may want to avoid. For example, some non-stimulant fat burners have mild doses of caffeine, which can have a negative effect on people who are very caffeine-sensitive. Also, keep an eye out for substances you might be allergic to, since ingredient lists don’t always contain an ingredient’s common name. Finally, athletes should keep an eye out for banned substances.
Small Doses of Stimulants
Occasionally, you’ll find smaller amounts of caffeine, even in non-stim fat burners. They’re included to help provide a spark to your energy levels, albeit to a lesser degree than stim-infused formulations. While 50 to 80 milligrams may not affect most people, those who are sensitive to caffeine should keep an eye out for it when shopping for a fat burner. For reference, the FDA states that a standard 12-ounce cup of coffee contains roughly 113 to 247 milligrams of caffeine. (4)
Allergens
Two common ingredients in fat burners are cayenne pepper and black pepper extracts. Both of these ingredients can help speed up metabolism; black pepper has the added benefit of potentially helping the body’s digestion and absorption.
However, some people are allergic to one or both of these ingredients, and should look for fat burners that don’t contain them. Be careful when reading ingredient lists, because often, they’ll be listed as the ingredients’ brand names or active chemicals like bioperine or capsaicin.
Banned Substances
If you’re an athlete or anyone else who may be tested for banned substances, you should know that some fat burners contain substances that could get you popped. For instance, Hordenine HCl, a chemical naturally found in barley, is a common ingredient in fat-burners, but is banned in many competitions, as well as by the Department of Defense. If you’re competing its worthwhile to check out the list of banned supplements to ensure you’re not getting disqualified.
Non-Stimulant Fat Burners Precautions
If you are thinking about taking a non-stimulant fat burner, there are a few precautions that you can take to maximize your safety and the effectiveness of whichever fat burner you go with.
First, as with any supplement, you should check with your doctor to see if whatever you’re considering is safe for your current health status and if it will be safe to use with any medications or other dietary supplements you might be taking.
Also, make sure you take the recommended daily dosage. It may be tempting to take more than instructed in an effort to speed up the process, but you likely won’t experience better results and it may put you at risk for adverse side effects.
And if you have a history with eating disorders or disordered eating, fat burners may not be the best choice to support your overall mental health and well-being.
What To Consider Before Buying Non-Stim Fat Burners
These products are prone to exaggeration on the part of the manufacturers and wishful thinking by consumers. Make sure you’re mindful of these points.
Know Your Calories
Way too many people think adding a fat burner, with no other changes to their diet, will produce a six-pack. Fat burners might help burn some extra calories, but if you don’t know how many calories you’re burning, it’s a moot point. While any of the best macro calculators can help you pinpoint your ideal calorie consumption, adding a fat burner might give you some support.
Remember, though, that fat burners work as supplements, not solutions — know your metabolic rate and figure out what’s leading to belly fat before trying to curb it with a capsule or powder. You may not even need this weight loss supplement if cravings management is feasible on your own.
Manage Your Expectations
It’s generally understood that a pound of fat loss per week is very fast, and you can maybe get to 2 pounds if you’re quite overweight or obese. Anyone who says they lost 20 pounds in a month is exaggerating — you need to be patient.
Exercise Regularly
Many of the ingredients linked to fat oxidation produce their best results with a solid exercise routine: They’re meant to increase the amount of fat burned during exercise.
In addition, exercise helps to burn more calories and improve body composition. Taking a fat burner without a workout routine may produce suboptimal results.
Understand Usage Guidelines
It can be enticing to try and speed up your weight loss schedule by taking more servings of your non-stim fat burner each day. In order to avoid potential negative side effects, though, it’s imperative you follow the on-container instructions accordingly. If you’re currently on any medications, such as those for cardiovascular health or blood sugar regulation, it’s also wise to speak to your healthcare provider prior to beginning your supplement routine. This conversation can help ensure that your weight loss supplements won’t negatively interact with your other prescribed compounds.
Speak to a Physician
This is absolutely key. It would be best if you never made any changes to your diet or exercise regimen without first speaking to a doctor. This is especially the case with easily-misunderstood supplements like fat burners.
How Much Do Non-Stim Fat Burners Cost?
Non-stim fat burners vary in their design, purpose, and ingredient list, which will affect the price point of each product. This list ranges in price from as low as $0.09 per serving all the way to roughly $1.67. Below, we’ve broken down the costs per serving of each highlighted non-stim fat burner for added clarity on pricing differences from one formulation to the next.
| Best Overall Non-Stim Fat Burner | Transparent Labs Recomp Stim-Free | $0.92 |
| Best Non-Stim Fat Burner for Bodybuilding | Jacked Factory Lean PM | Starting at $0.42 |
| Best Research-Backed Non-Stim Fat Burner | Legion Phoenix Stim-Free | $1.67 |
| Best L-Carnitine | 1st Phorm L-Carnitine | $0.72 |
| Best Berberine | Bulk Supplements Berberine HCL Powder | Starting at $0.09 |
| Best Green Tea Extract | Thorne Green Tea Extract | $0.50 |
Best Non-Stim Fat Burners FAQs
What is the best non-stim fat burner?
With such a plethora of options to choose from, we’re big fans of the simple yet effective formula of Transparent Labs Recomp Stim-Free. This transparent product features ingredients intended to promote thermogenesis and help increase your calorie burn, like red pepper extract. Plus, each serving is a manageable two capsules, making it more approachable even for more pill-averse individuals.
Are non-stim fat burners still effective?
Yes; although caffeine may be a helpful fat burning ingredient, there are many non-stimulant fat burning ingredients available that also have the potential to help you reduce body fat. Some of the ingredients you’ll find in these non-stim fat burners are chromium, cayenne pepper which is also called capsicum, carnitine, and choline.
Why would I choose a non-stim fat burner over one with stimulants?
There are several reasons someone may opt for a stim-free fat burner. Some people may be sensitive to stimulants and choose not to include them in their diet. Some may prefer to get their caffeine intake from coffee or a caffeinated tea. Others may not like how stimulants make them feel later in the day. There is no right or wrong answer; it just boils down to what makes the most sense for your healthy lifestyle choices.
What are the downsides of a stim-free fat burner?
Although there are no technical “downsides” as non-stim fat burners can be just as effective as fat-burners with stimulants, the only thing you’d be missing out on is another potential avenue for fat burning, as well as the heightened sense of alertness or focus some people receive from caffeine.
How much do stim-free fat burners cost?
Stim-free fat burners can range in price, and on this list alone, you’ll find a range between around $0.09 to $1.67. Of course, though, these metrics can vary from brand to brand and can be altered through Subscribe & Save services or bulk ordering.
References
- Purdom, T., Kravitz, L., Dokladny, K. et al. Understanding the factors that effect maximal fat oxidation. J Int Soc Sports Nutr 15, 3 (2018). https://doi.org/10.1186/s12970-018-0207-1
- Himms-Hagen J. Role of thermogenesis in the regulation of energy balance in relation to obesity. Can J Physiol Pharmacol. 1989 Apr;67(4):394-401. doi: 10.1139/y89-063. PMID: 2667732.
- Purdom T, Kravitz L, Dokladny K, Mermier C. Understanding the factors that effect maximal fat oxidation. J Int Soc Sports Nutr. 2018 Jan 12;15:3. doi: 10.1186/s12970-018-0207-1. PMID: 29344008; PMCID: PMC5766985.
- Commissioner, O. of the. (2024, August 8). Spilling the beans: How much caffeine is too much?. U.S. Food and Drug Administration. https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much
- Peng, W.-Q., Xiao, G., Li, B.-Y., Guo, Y.-Y., Guo, L., & Tang, Q.-Q. (2021). l-theanine activates the browning of white adipose tissue through the AMPK/α-ketoglutarate/PRDM16 axis and ameliorates diet-induced obesity in mice. Diabetes, 70(7), 1458–1472. https://pubmed.ncbi.nlm.nih.gov/33863801/
- Rondanelli, M., Klersy, C., Iadarola, P., Monteferrario, F., & Opizzi, A. (2009). Satiety and amino-acid profile in overweight women after a new treatment using a natural plant extract sublingual spray formulation. International Journal of Obesity, 33(10), 1174–1182. https://pubmed.ncbi.nlm.nih.gov/22142813/
- Barnes, M. E., Cowan, C. R., Boag, L. E., Hill, J. G., Jones, M. L., Nixon, K. M., Parker, M. G., Parker, S. K., Raymond, M. V., Sternenberg, L. H., Tidwell, S. L., Yount, T. M., Williams, T. D., Rogers, R. R., & Ballmann, C. G. (2022). Effects of acute yohimbine hydrochloride supplementation on repeated supramaximal Sprint Performance. International Journal of Environmental Research and Public Health, 19(3), 1316. https://pmc.ncbi.nlm.nih.gov/articles/PMC8835515/
- Ferreira, G. C., & McKenna, M. C. (2017). L-carnitine and acetyl-l-carnitine roles and neuroprotection in developing brain. Neurochemical Research, 42(6), 1661–1675. https://pmc.ncbi.nlm.nih.gov/articles/PMC5621476/
