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Do Fat Burners Work? What Trials of Caffeine and Green Tea Combinations Show
Do fat burners work? Only a little, at best. A 2021 review of 315 trials found most showed no weight loss (UNC / Obesity 2021, Review of weight-loss supplements), and pooled averages for green tea and garcinia sit near 1 kg or less. No study has tested SodaSlim, which pairs 138 mg of caffeine with four other extracts in one capsule.
Written by the SodaSlim label deskUpdated · 4 min read
Do fat burner supplements work for weight loss?
They work very little, and often not at all. The NIH puts it bluntly: little scientific evidence shows they work.
A 2021 review of 315 trials found most showed no weight loss (UNC / Obesity 2021, Review of weight-loss supplements). Of the 16 low-risk-of-bias trials with a positive result, differences ran from 0.3 to 4.93 kg.
"Fat burner" is a marketing word, not a medical class. It usually means caffeine plus plant extracts.
What do caffeine and green tea trials show?
They show small differences that depend on the product. Green tea alone moved weight by almost nothing in the best-run reviews.
A Cochrane review found -0.04 kg outside Japan, which is not significant (Cochrane, Green tea for weight loss (Jurgens)). The NIH adds that catechins plus caffeine gave about 1.38 kg more loss than caffeine alone, while catechins alone had no effect (NIH ODS, Dietary Supplements for Weight Loss (health professionals)).
| Ingredient or combo | Reported average |
|---|---|
| Green tea, outside Japan | -0.04 kg, not significant |
| Catechins plus caffeine vs caffeine alone | About 1.38 kg more |
| Garcinia extract | -0.88 kg, small and uncertain |
| Green coffee extract | Three poor-quality trials |
| Raspberry ketone | Almost no human data |
Averages are not promises. Most people sit above or below them.
How does the SodaSlim label compare?
SodaSlim combines all of the above in one capsule: 130 mg each of green coffee, raspberry ketone, garcinia and green tea extracts, plus 138 mg of caffeine.
The trials above tested other products and doses. Research on an ingredient does not automatically carry over to a finished product, so no result here transfers to SodaSlim.
Use the map below to see what the label prints and what it leaves out.
- Printed
Amounts of all five lines
Every line has an amount in mg on the label. Some descriptions of this product say no amounts are printed; this site follows the label itself.
- Partly printed
Total caffeine from every source
Caffeine anhydrous is 138 mg. Green tea extract adds under 3.9 mg by its own standardization. The green coffee line does not say how much caffeine it holds. (Onakpoya 2011, Green coffee extract meta-analysis) (NIH ODS, Weight loss supplements (consumers))
- Not printed
Who makes it
The label names a distributor (Gex Corporation LLP), not a manufacturer or factory.
- Not printed
Time of day, food and water
The label says take one capsule daily and nothing more. Morning comes from the seller's copy.
- Not printed
Third-party test or certifier
The badges NON-GMO and GMP CERTIFIED name no certifier or audit. A lot code and CoA reference are seller references, not lab proof. (FDA, Questions and answers on dietary supplements)
- Not printed
Where raspberry ketone comes from
No plant part or standardization is printed. Raspberries hold only trace amounts, so a 130 mg dose is not food-sized. (Rao 2021, Raspberry ketone review)
- Not printed
Studies of this product
None found. Research on single ingredients does not carry over to a finished product at other doses and in combination. (FTC, Health Products Compliance Guidance)
- Not printed
Allergen statement
The label prints no allergen line. The capsule is hypromellose (a vegetable capsule).
SodaSlim: 30 capsules, 30-day bottle1 capsule a day · 2, 3 or 6 bottles · price and guarantee terms at checkout
See packsWho should ask a doctor before trying one?
Anyone with a heart rhythm problem, high blood pressure, liver disease, anxiety, a thyroid condition, or who is pregnant or nursing should ask first.
The SodaSlim label says it is not for anyone under 18 or pregnant or nursing, and to consult a physician if you take a medicine. Keep taking prescribed medicine. Chest pain, fainting, a racing heart, dark urine or yellow skin or eyes need care now.
Where do I see the label before ordering?
The ingredients page lists every line. A bottle lasts 30 days, so the 3 and 6 bottle packs cover 90 and 180 days.
Price and guarantee terms are shown at checkout.
90-day supply
3 bottles: 90 days
90capsules · price shown at checkout
Ships from the U.S. · money-back guarantee
Order 3 bottles
180-day supply
6 bottles: 180 days
180capsules · price shown at checkout
Ships from the U.S. · money-back guarantee
Order 6 bottlesA 2-bottle pack is also shown by the brand. Check your medicines with your doctor or pharmacist before you order.
FAQ01
SodaSlim questions people ask
Do fat burner pills really change body fat?
Studies show small average changes, not large ones. A 94-study review found caffeine nudged lab markers of fat metabolism, not body weight (Meta-analysis, Does caffeine increase fat metabolism?).
Is a fat burner better than diet and exercise?
No source says so. Mayo Clinic and the CDC describe diet and activity as the base of a steady 1 to 2 pounds a week.
How much weight can a fat burner help you lose?
In the better-quality reviews the average difference is about 1 kg or less. Individual results vary, and no study tested SodaSlim.
Sources (9)
- Dietary Supplements for Weight Loss: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2026
- Dietary Supplements for Weight Loss: Fact Sheet for ConsumersNIH Office of Dietary Supplements, 2021
- Review shows minimal high-quality evidence dietary supplements lead to weight lossUNC Health / UNC School of Medicine (study by J. Batsis, Obesity journal), 2021
- Green tea for weight loss and weight maintenance in overweight or obese adultsCochrane (Jurgens TM et al.), 2021
- The Use of Green Coffee Extract as a Weight Loss Supplement: A Systematic Review and Meta-Analysis of Randomised Clinical TrialsOnakpoya I, Terry R, Ernst E, Gastroenterology Research and Practice, 2011
- Pharmacological Exploration of Phenolic Compound: Raspberry Ketone (Update 2020)Rao S, Kurakula M, et al., Plants, 2021
- Does caffeine increase fat metabolism? A systematic review and meta-analysisInternational Journal of Sport Nutrition and Exercise Metabolism (authors not shown on the record read), 2023
- Questions and Answers on Dietary SupplementsU.S. Food and Drug Administration, 2026
- Health Products Compliance GuidanceFederal Trade Commission, 2022
Who wrote this02
Written and reviewed by
Pages built from the label, the seller’s materials and linked NIH, FDA, FTC, Mayo Clinic and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site of Thesodaslim, a USA authorized SodaSlim retailer. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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Check your medicines and your daily caffeine first, then pick a supply. One capsule a day; one bottle lasts a month. The checkout shows the live price and the guarantee terms before you pay.
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