Best Fat Burners for Men of 2025, Reviewed by a Dietitian

Why We Like It

If you’re absolutely in need of a fat burner supplement to support your calorie deficit and workout regimen, we recommend Body Recomp from Transparent Labs. In addition to the convenient two-capsule serving size, we also appreciate that this fat burner is third-party tested for added peace of mind, similar to Transparent Labs’ other offerings including some of the best protein powders and pre-workouts we’ve had in testing.

“While I’m normally hesitant to suggest a fat burner, I do like that Transparent Labs Body Recomp carries a seal of approval from Informed Choice,” states registered dietitian and BarBend expert reviewer, Chelsea Rae Bourgeois, who rates the formulation at 3.5 out of 5 and third-party testing at 4.5 out of 5. “Plus, the capsules can be easier to manage than a powdered supplement — one less thing to mix up and blend throughout the day.”

Two standout ingredients from this high-quality formulation include Capsimax red pepper extract and Bioperine black pepper extract. Studies report that red pepper extract (typically from cayenne pepper seeds) can potentially influence weight management and promote improved cardiovascular health, while black pepper extract has been linked to anti-inflammatory effects and better bioavailability of key nutrients. (2)(3) There’s also a 125-milligram serving of natural caffeine from green coffee beans, which is within the FDA-recommended upper intake of 400 milligrams daily and can promote boosted energy for daily expenditure and training. (4)

Of course, though, Transparent Labs recommends avoiding Body Recomp servings close to your sleep schedule, as the caffeine counts may influence your ability to rest. “I’ll add, too, that the 125 milligrams of caffeine is per serving,” notes Bourgeois. “If you’re sensitive to stimulants, it may be too high of a dose for the entire day.”

Speaking of the servings, while we like the two-capsule serving size, it’s recommended that you consume two servings daily for optimal results. We score the servings at 3 out of 5 and recommend something like Legion Phoenix if you need a more convenient, single-serving supplement routine.

Good for: Athletes looking for fat burning pills that are third-party tested and free of banned substances.

Read our full Transparent Labs Fat Burner Review.

Why We Like It

Fat burners work differently depending on the included ingredients. Some focus on appetite control and managing food cravings while others may increase your body temperature to burn more calories (aka thermogenesis). For those who want a thermogenic fat burner, we recommend Jacked Factory BURN-XT.

“Fat burners usually give me pause, but I like that BURN XT doesn’t promise magic results and it contains many of the same ingredients you’d find in some of the best pre-workout supplements,” says BarBend expert contributor and RDN, Chelsea Rae Bourgeois.

To help promote higher body temperatures for the sake of caloric burn, BURN-XT utilizes 450 milligrams of green tea extract alongside 270 milligrams of caffeine anhydrous — two natural ingredients that studies link to potential thermogenic effects. (5) “Of course, though, if you’re sensitive to caffeine, this dosage may leave you feeling jittery,” notes Bourgeois, who rates the formulation at 3.5 out of 5.

You also get 700 milligrams of l-carnitine, which is a naturally-occurring nutrient found concentrated in tissues that oxidize fatty acids as a dietary fuel. (6) While the body can be fine without carnitine supplementation, added dosages may be linked to improved fat metabolism and fat mass maintenance. (7) However, this is probably most beneficial for people with larger amounts of body fat or those with diagnosed obesity, according to Jillian Kubala, RDN.

Jacked Factory recommends starting out your BURN-XT experience with a single capsule taken twice daily. Once you’ve established your tolerance, you can adjust the dosage to two capsules. While we do appreciate the included supplement facts for one- and two-capsule serving sizes, we do rate the dosage at 3 out of 5 given that you must take these pills alongside a whole-food meal. If you’d rather take a single serving of fat burner capsules, we suggest looking at something like Legion Phoenix.

Jacked Factory Burn XT also comes at a pretty reasonable price, earning a 5 out of 5 rating for cost. One 60-serving bottle is $54.99, which is about $0.92 per serving. Despite the two suggested servings daily, this is still one of our most budget-friendly options.

Good for: Individuals wanting a fat burner supplement with an emphasis on boosted thermogenesis.

Why We Like It

Perhaps your training schedule is more attuned to evening workouts prior to a night’s sleep. Maybe you’re more a fan of the best non-stim pre-workouts that don’t leave you with hours worth of jitters post-consumption. Regardless of your reasoning for abstaining from stimulants like caffeine, there is an appropriate fat burner supplement to fit your preferences — Legion Phoenix Stim-Free.

This formulation is available with or without caffeine, but we’re focusing on the caffeine-free variety for this particular review. We score the formulation at 3.75 out of 5 thanks to its robust list of compounds that target multiple fat-burning modalities like appetite suppression, thermogenesis, and increased metabolic rate. “The fact that Legion Phoenix is third-party tested by an ISO 17025-accredited third-party laboratory is also noteworthy, giving you added assurance that the formulation is free of heavy metals, microbes, and other potential contaminants,” adds Chelsea Rae Bourgeois, RDN/

We also appreciate that the directions for Legion Phoenix call for just a single serving per day, ideally taken first thing in the morning with an accompanying meal. “Naturally, the three-capsule serving may be a bit much for those less enthused by taking capsules,” adds Bourgeois, “But the single-serving per day is more convenient than other fat burners.” As such, we score the dosage convenience at 4 out of 5.

While this Legion offering is impressive and could be a supporting character for addressing excess fat, it does come at a higher price tag. One 30-serving bottle is listed with an MSRP of $49.99, which equates to roughly $1.67 per serving. This earns Phoenix Stim-Free a 3 out of 5 for price. If you’re interested in more budget-friendly fat burners, consider Transparent Labs Body Recomp or Jacked Factory BURN-XT. Be mindful, though, that these formulations do contain caffeine, which may not be aligned with your tastes and preferences.

Good for: Individuals wanting a caffeine-free fat burner option.

Read our full Legion Phoenix Fat Burner Review.

Why We Like It

L-carnitine is a key amino acid derivative responsible for supporting multiple bodily functions such as energy production, compound transportation, and fatty acid utilization. (6) As one of the best carnitine supplements on the market, we recommend 1st Phorm L-Carnitine for athletes wanting to reap the ingredient’s weight management benefits. (7)

One reason we recommend this l-carnitine powder over others is the respectable dose each serving provides. “Current research points to a 2,000-milligram dose of l-carnitine for weight loss needs,” says Chelsea Rae Bourgeois, RDN, who rates the formulation at 3.75 out of 5. “1st Phorm’s L-Carnitine delivers 1,500 milligrams per serving, which is relatively close to the recommended daily intake for fat loss goals.” (7)

In addition to the l-carnitine, you can also find common thermogenic ingredients like green tea extract (200 milligrams) for tackling weight loss on multiple fronts. As a certified nutrition coach, I’ve also used 1st Phorm L-Carnitine in the past for boosting endurance and do enjoy the available tastes this powder brings to the table. If you’re targeting weight loss, having a flavored powder can be a nice reprieve from other flavorless fat burning options. I do rate the flavor at 4 out of 5, though, since the formulation uses sucralose as a sweetening agent along with artificial flavors, which may create an overwhelmingly sugary profile less ideal for some athletes.

Naturally, too, you’ll need your best shaker bottle in order to effectively consume this supplement, whereas other fat burners like Transparent Labs Body Recomp and Legion Phoenix only call for an accompanying glass of water (and a suggested whole-foods meal). I rate the convenience at a conservative 3.5 out of 5 and suggest you opt for capsuled fat burners if you’d rather not clean your shakers on a more regimented schedule.

Lastly, Bourgeois states, “This supplement isn’t third-party tested, leaving some questions surrounding the label accuracy.” We’ve tested other fat burners that do contain third-party approval, so we have to rate 1st Phorm L-Carnitine at 1 out of 5 for the category.

Good for: Those wanting an l-carnitine supplement available in multiple flavors.

Why We Like It

For athletes wanting a simple, single-ingredient supplement for supporting their weight loss journey, we recommend considering BulkSupplements Berberine HCL Powder. This formulation is composed entirely of the bioavailable quaternary ammonium salt and free of any additives, soy, dairy, or gluten. Plus, you can purchase this dietary supplement in multiple container sizes with costs per serving as low as $0.10.

While we include this Berberine HCl powder on our list of best fat burners, we do admit that research is rather limited on its effects on weight loss. “Of the available information, it appears berberine HCl’s main mechanism for supporting weight loss lies in its effects on gut health and managing your microbiota, similar to some of the best probiotic supplements,” says Chelsea Rae Bourgeois, RDN. (8) “While these studies can be promising, I still rate the formulation at 2.5 out of 5 given the lack of confirmed information.”

Berberine HCl is available in powdered form, which can be convenient for some athletes looking to add another ingredient to their weight loss smoothie recipe. However, we score the dosage convenience at 3.5 out of 5 since there is no scooper within the purchased containers. You’ll need to provide your own measuring cup to achieve a proper 500-milligram dose. If you’re less enthused about this, it may be best to stick to capsuled fat burners like Transparent Labs Body Recomp or BURN-XT from Jacked Factory.

Despite this scooper-lacking profile, we do rate the value at 5 out of 5. With costs per serving as low as $0.10, this is easily the most affordable fat burner supplement in this guide. If you’re confident in the research, this could be a cheap, affordable weight loss supplement that can be easily added to your daily regimen. “As always, though, it’s best to consult with your personal healthcare provider before beginning any supplement, especially one with limited research,” states Bourgeois.

Good for: Budget-minded athletes in search of a potential weight loss supplement.

Why We Like It

Green tea and weight loss have been linked together for years, and multiple studies report that it can be an effective fat burning supplement thanks to its positive relation to increasing energy metabolism, managing diabetes, and promoting cardiovascular health. (10)(11)(12) Thanks to its low cost per serving and simple formulation, we think Thorne’s Green Tea Extract is one of the best green tea supplements for supporting your weight loss journey.

Chelsea Rae Bourgeois, RDN rates the formulation at 4 out of 5, stating, “The lone ingredient is green tea phytosome, and I’m happy that there’s multiple studies to support its use as a thermogenic for supporting weight loss.”

We also rate the convenience at 4 out of 5 since the serving size is one capsule. While Thorne does suggest consuming two to three servings daily, one pill can be more of a manageable allotment than other fat burners calling for two or more capsules per dose. If you’d rather take a powdered supplement, you could try 1st Phorm L-Carnitine as an alternative.

Thorne Green Tea Extract also earns our praise for its value, earning a 4 out of 5 for the category. You can purchase a 60-serving container for $32, which equates to roughly $0.53 per dose (or roughly $1.59 per day if taking three servings). This can be more budget-friendly than other fat burners we’ve tested, although those products do contain other weight loss ingredients that can offer more robust support.

As a final note, Bourgeois does stress the importance of speaking to your healthcare professional before subscribing to a green tea supplement regimen. “While the polyphenols in green tea offer liver-protective benefits, green tea extract, particularly in capsuled form, can lead to liver injury and irritation in certain athletes,” she states. (11) “It’s always good practice to speak to your personal doctor before beginning a green tea supplement, just to ensure you’re fit for regular consumption.”

Good for: Athletes looking for an affordable green tea extract supplement.