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Top Fat Burners of 2021
A good fat burner can help you lose inches and achieve a more toned appearance, but unfortunately there are lots of ineffective products out there. So, we’ve done the time-consuming research and tracked down the very best fat burners to help you reach your goals faster!
#1 Five Star Fat Burner
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96
0/5
Overall Rating
Effectiveness
98
98%
Speed of Results
92
Ingredient
Quality
Quality
99
PROS
- Clinically-proven key ingredients
- 100% caffeine-free
- Made in the USA
CONS
- Only available online at Phen.com
5 Star Fat Burner is a natural, thermogenic fat burner. It relies on two clinically-proven key ingredients, plus five powerful supporting ingredients, to maximize fat-burning potential and promote weight loss. The main ingredients are Capsimax® (hot pepper extract) and GreenSelect® Phytosome® (green tea extract). 5 Star Fat Burner capsules are vegetarian, made in the USA and 100% caffeine-free. This supplement is sold online on Phen.com.
#2 Genius Burn
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89
0/5
Overall Rating
Effectiveness
88
88%
Speed of Results
85
Ingredient
Quality
Quality
95
PROS
- Clinically-proven active ingredients
- All-natural & caffeine-free
CONS
- Expensive
- May cause stomach upset
Genius Burn capsules have four main ingredients: TeaCrine®, Sensoril®, Capsimax®, and iFAS503™. They are produced by The Genius Brand and designed to provide both a metabolic and cognitive boost. These pills contain clinically-proven key ingredients and are made in the USA, but many users report stomach upset and the capsules are relatively-expensive compared to other fat burners on the market.
#3 Burn XT
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83
0/5
Overall Rating
Effectiveness
82
82%
Speed of Results
79
Ingredient
Quality
Quality
88
PROS
- Gentle but noticeable energy boost
- Mild appetite suppressant
CONS
- Negative side effects common
- Inconsistent results
Burn XT is a thermogenic fat burner. It is sold by Jacked Factory and intended to help users boost metabolism and burn fat. Burn XT has five main ingredients. The bottle recommends that users take 2 capsules 1-2x per day. Unfortunately, many reviewers complain that this supplement causes uncomfortable side effects and produces inconsistent results.
#4 Force Factor LeanFire
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81
0/5
Overall Rating
Effectiveness
83
83%
Speed of Results
79
Ingredient
Quality
Quality
81
PROS
- Boosts energy and aids weight loss
- Clinically proven ingredients
CONS
- May cause digestive issues
- Contains caffeine
LeanFire is a weight loss supplement made with Verilean, an ingredient clinically proven to aid weight loss. Each capsule also contains 150mg of caffeine paired with L-theanine to provide an energy boost. However, there are some drawbacks to LeanFire. Verilean can cause digestive issues, most of which are related to its natural caffeine content.
#5 Invigor8 Fat Burner
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80
0/5
Overall Rating
Effectiveness
87
87%
Speed of Results
80
Ingredient
Quality
Quality
72
PROS
- Generous return policy
- Made in the USA
CONS
- Users take up to 6 pills per day
- Site run subscription service
- May interfere with sleep
Invigor8 Fat Burner is a thermogenic fat burner that uses eight natural ingredients to burn fat, suppress appetite and boost energy, mood & metabolism. It has positive customer reviews, but users have to take a lot of pills (4-6 capsules each day) to see results. Invigor8 Fat Burner is sold by Biomedical Research Laboratories, LLC.
#6 Vintage Burn
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79
0/5
Overall Rating
Effectiveness
84
84%
Speed of Results
81
Ingredient
Quality
Quality
73
PROS
- Burns fat & preserves lean muscle mass (supposedly)
- Made in the USA
CONS
- Various negative side effects
- Contains caffeine
Vintage Burn is a “muscle-preserving” fat burner that aims to boost metabolism and fat loss without sacrificing users’ hard-earned lean muscle mass. This is a great concept in theory, but many former customers report negative side effects: ranging from mild gastrointestinal (GI) upset to more severe reactions like dizziness or excessive sweating. Vintage Burn is sold by Old School Labs.
#7 Trimtone
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78
0/5
Overall Rating
Effectiveness
76
76%
Speed of Results
73
Ingredient
Quality
Quality
85
PROS
- 100% natural ingredients
- No side effects
CONS
- Contains caffeine
- Not suitable for vegans
Trimtone is a fat burner that is specifically formulated for women. Its natural ingredients reduce appetite and boost metabolism. Unfortunately, Trimtone contains as well caffeine which may cause sleeplessness and irritability.
#8 C4 Ripped
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78
0/5
Overall Rating
Effectiveness
86
86%
Speed of Results
72
Ingredient
Quality
Quality
76
PROS
- Effective energy boost to workout
- Encourages holistic approach to weight loss & fat loss
CONS
- Terrible side effects
- Powder gets clumpy
- Some flavors taste bad
C4 Ripped is a powdered mix that boosts athletic performance to help users reduce body fat, when used in combination with a clean diet and proper exercise. The recommended dosage is one scoop, combined with six ounces of water, taken 20 to 30 minutes prior to physical activity. Unfortunately, C4 Ripped produces a range of uncomfortable side effects. Some users report tightness in the chest and increased heart rate or blood pressure.
#9 Lux Keto BHB
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75
0/5
Overall Rating
Effectiveness
62
62%
Speed of Results
84
Ingredient
Quality
Quality
78
PROS
- Boosts energy & combats "keto flu" symptoms
- Made in the USA
CONS
- Only works with ketogenic diet
- Contains caffeine, which may cause side effects
Keto BHB is targeted at people who have recently started the ketogenic (keto) diet and are struggling to achieve ketosis, or grappling with “keto flu” symptoms. It comes from Lux Supplement and contains a blend of ingredients with purported fat-burning and energy-boosting effects. Many users, however, experience side effects and only some report any positive effect after taking this supplement.
#10 Skinny Gal
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74
0/5
Overall Rating
Effectiveness
74
74%
Speed of Results
65
Ingredient
Quality
Quality
82
PROS
- Affordable & good return policy
- Made for women, by women
CONS
- Unproven ingredients
- Negative side effects
- Unreliable customer reviews
Skinny Gal is a thermogenic fat burner that uses all-natural ingredients to boost the body’s metabolism. It is designed specifically for women, by women, to address female’s unique fat loss needs. However, the ingredients are not clinically-proven and the capsules produce various negative side effects. More: the manufactures of this supplement, Rockstar, send-out free product in exchange for positive feedback, which calls into question the validity of this supplement’s reviews.
#11 Nobi Nutrition Premium Women’s Fat Burner
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74
0/5
Overall Rating
Effectiveness
75
75%
Speed of Results
70
Ingredient
Quality
Quality
77
PROS
- Formulated for women
- Supports ketosis
CONS
- Large capsules
- Causes "keto flu" symptoms
Nobi Nutrition Premium Women’s Fat Burner is designed to help users tone up and slim down. The capsules are made in a GMP certified facility in the USA, giving users confidence in the product’s origins. However, its appetite suppressant properties are short-lived, and the capsules can cause a wide range of side effects.
#12 ProbioSlim
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73
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Overall Rating
Effectiveness
76
76%
Speed of Results
68
Ingredient
Quality
Quality
75
PROS
- Promotes healthy digestion
- Increases thermogenesis
CONS
- Takes three months to notice full benefits
- Contains caffeine which may cause side effects
ProbioSlim capsules contain energy-boosting caffeine and the probiotic LactoSpore for weight management and healthy digestion. However, there are some drawbacks to choosing ProbioSlim. Although users may notice mild changes early on, it can take three or more months to experience the full benefits.
#13 Animal Cuts
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73
0/5
Overall Rating
Effectiveness
68
68%
Speed of Results
80
Ingredient
Quality
Quality
72
PROS
- Boosts energy
- Caffeine pill optional
CONS
- Potential side effects
- Expensive
Animal Cuts is a powerful “cutting” supplement, geared primarily at bodybuilders & fitness enthusiasts. This fat burner consists of nine separate pills, taken each day in a ‘three weeks on, three weeks off’ cycle. Animal Cuts may be an effective method for quick fat loss, but this intense & expensive supplement also causes a wide range of severe and worrisome side effects.
#14 Lean PM
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72
0/5
Overall Rating
Effectiveness
71
71%
Speed of Results
65
Ingredient
Quality
Quality
79
PROS
- Stimulant-free
- Improves sleep quality naturally
CONS
- May worsen insomnia/anxiety
- Unproven effectiveness
Lean PM is a “nighttime fat burner” designed to support better sleep quality and burn fat overnight. It’s made by Jacked Factory. Lean PM it is different than other fat burners because it’s specifically intended to work at night. Adults are instructed to take two capsules 40 minutes before bedtime to achieve optimal results. Unfortunately, Lean PM actually worsens insomnia and anxiety for some users.
#15 AtraFen Elite
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70
0/5
Overall Rating
Effectiveness
65
65%
Speed of Results
68
Ingredient
Quality
Quality
77
PROS
- Made in the USA
- All-natural ingredients
CONS
- Variable effectiveness
- Bad side effects
- No refund for open bottles
Atrafen Elite is a thermogenic diet pill designed to support weight management by providing both physical and mental benefits. Sadly, this supplement falls short of its claims with customers consistently reporting side effects like headaches, breakouts and stomachaches. Some reviewers even go so far as to compare these pills to a multivitamins, given their lack of effectiveness. Atrafen Elite is sold by Nutratech Health.
#16 Evlution Nutrition LeanMode
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68
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Overall Rating
Effectiveness
67
67%
Speed of Results
72
Ingredient
Quality
Quality
65
PROS
- Contains five active ingredients
- Vegan & gluten-free
CONS
- Green coffee contains caffeine
- FDA warns against garcinia
- Difficult to get refunds
LeanMode is a stimulant-free supplement that boosts the metabolism and curbs appetite cravings for weight loss support. Its suitable for vegans and those following a gluten-free diet. However, it can also be a dangerous choice for some. Although the capsules are stimulant-free, green coffee naturally contains small amounts of caffeine and the FDA warns against the use of garcinia cambogia.
