Garcinia Cambogia
A tropical fruit extract containing hydroxycitric acid (HCA), promoted heavily as a fat burner. One of the most widely sold and marketed weight loss supplements. The evidence tells a different story: when only the well-conducted trials are analysed, the weight loss effect essentially disappears. A 2025 review of 14 studies found none of them demonstrated clinically significant weight loss.
Quick read · 3 min
- •Evidence: Very weak — little to no reliable trial evidence
- •A 2020 meta-analysis of 8 randomised controlled trials found borderline statistically significant weight loss of 1.
- •Headache and GI symptoms (nausea, diarrhoea, stomach discomfort) are the most common side effects.
- •Prescription weight loss drugs produce 7–21% weight loss in trials. Most supplements in this category produce less than 2 kg.
Based on clinical trials · No rankings · Every claim linked to source
Last reviewed: March 2026
How it works
HCA (hydroxycitric acid) is proposed to inhibit an enzyme called ATP-citrate lyase, which is involved in converting excess carbohydrates into fat for storage. It may also increase serotonin levels, which could modestly reduce appetite. These mechanisms are plausible in theory — the problem is they haven't translated into meaningful effects in rigorous human trials.
What the evidence shows
A 2020 meta-analysis of 8 randomised controlled trials found borderline statistically significant weight loss of 1.34 kg vs. placebo (p=0.03). However, when only the most rigorous trials are analysed, the effect is no longer statistically significant. A 2025 scoping review of 14 studies concluded that all 14 failed to demonstrate clinically significant weight or BMI reduction. The marketing claims for garcinia cambogia are substantially stronger than the evidence supports.
Safety
Headache and GI symptoms (nausea, diarrhoea, stomach discomfort) are the most common side effects. There have been reports of liver toxicity at high doses — while rare, the FDA and NIH have noted these cases. Given the very weak evidence for benefit, the risk-benefit ratio is unfavourable. Not recommended as a weight loss treatment.
Community insights
These are personal experiences shared in public online communities — not medical advice.
“This supplement was made famous by TV promotion, not by clinical evidence. The science has consistently not backed up the marketing claims.”
“If you want to try something in this price range, berberine or chitosan have much stronger evidence. Garcinia cambogia is not worth the money.”
Common questions
After reading this page, most people compare this with other supplements, look at prescription options, or check what they can do today without a prescription.