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Garcinia cambogia (Hydroxycitric Acid)
A hugely-marketed weight-loss fruit (hydroxycitric acid). The honest verdict: the landmark RCT and meta-analyses show little to no real weight loss beyond placebo, and there are documented reports of liver injury — risk likely outweighs the marginal benefit.
What the evidence says
Most Garcinia Cambogia studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality randomised trials published 1998–2018 with a typical study size of 135 participants.
Based on 4 studies · 1 RCT · 135 total participants
Confidence
LowBy outcome
Garcinia Cambogia has an evidence score of 2.5/10 — emerging evidence based on 4 indexed studies. A hugely-marketed weight-loss fruit (hydroxycitric acid). The honest verdict: the landmark RCT and meta-analyses show little to no real weight loss beyond placebo, and there are documented reports of liver injury — risk likely outweighs the marginal benefit. Representative study: PMID 9820262.
The commonly studied dose of Garcinia Cambogia is Commonly 500-1500mg HCA daily — but efficacy is not established. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Explore: Best supplements for Vitality & Longevity
Last reviewed June 2026 · evidence from 4 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Garcinia cambogia (Malabar tamarind) contains hydroxycitric acid (HCA), claimed to block fat synthesis and suppress appetite. It is one of the most heavily marketed weight-loss supplements — but the evidence does not support the hype. The landmark 135-person randomized trial (Heymsfield 1998) found NO significant weight or fat loss beyond placebo, and meta-analyses find only a small, low-confidence, clinically-insignificant short-term effect amid poor-quality trials. More concerning, there are documented case reports of hepatotoxicity (serious liver injury), some requiring transplant, linked to Garcinia-containing products. For most people the risk outweighs the marginal, unreliable benefit.
HCA inhibits ATP-citrate lyase (fat synthesis) in theory — but this doesn't translate to human weight loss.
Proposed appetite suppression via serotonin — also unsupported clinically.
How Garcinia Cambogia works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Tap node to isolate • Pinch to zoom • Tap edge for research
Commonly 500-1500mg HCA daily — but efficacy is not established
Take with food
| Form | Type |
|---|---|
| 💊Not recommended for weight loss (weak evidence + liver risk) | Recommended |
Risk likely outweighs marginal benefit.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Marketed pre-meal; efficacy unproven.
Dose-response data unavailable. The current published research for Garcinia Cambogia does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
Controlled trials show no meaningful weight loss vs placebo.
Documented case reports of hepatotoxicity.
Avoid — documented hepatotoxicity reports.
Avoid — serotonin syndrome risk.
Additive liver-injury risk — case reports of serious hepatotoxicity with Garcinia.
Theoretical serotonin syndrome risk via proposed serotonergic action.
HCA may lower blood glucose — monitor.
Tip: Stop immediately and seek care if jaundice/dark urine/abdominal pain
Tip: Reduce dose
Tip: Avoid combining with serotonergic drugs
Both are popular weight-loss supplements with weak underlying evidence.
(Both modestly/poorly evidenced for weight.)
Garcinia Cambogia pairs with Hoodia: Both are popular weight-loss botanicals with weak or negative human evidence; pairing them does not overcome the lack of
No established benefit — both have thin or negative weight-loss evidence.
The best time to take Garcinia Cambogia is with meals. Take it with food. Marketed before meals; note that controlled trials do not support a weight benefit.
Garcinia Cambogia should be used with caution — talk to a healthcare provider before taking it. The most commonly reported side effects are hepatotoxicity (liver injury), GI upset, headache, serotonin-related effects (with SSRIs). Use caution if any of these apply to you: Liver disease; Use with hepatotoxic drugs; SSRIs/serotonergic drugs (serotonin syndrome risk).
Absorbs up to 50x its weight in water, creating strong satiety — supports weight loss, blood sugar regulation, and cholesterol reduction.