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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
Garcinia Cambogia doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 1998–2026 with a typical study size of 135 participants.
Based on 24 studies · 4 meta-analyses · 7 RCTs · 157 total participants
Confidence
High confidenceBy outcome
The landmark double-blind RCT found no weight or fat loss beyond placebo, a meta-analysis found only about 1.3 kg extra loss, reviews call the results inconsistent, and there are documented hepatotoxicity case reports — placing it at the low end of Emerging.
No trials currently enrolling · 7 completed on ClinicalTrials.gov
Registered trials show research momentum for Garcinia Cambogia, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
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 a 2020 meta-analysis of eight trials (530 people) found only a small extra loss of 1.34 kg against placebo.
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.
Avoid — documented hepatotoxicity reports.
Avoid — serotonin syndrome risk.
Additive liver-injury risk — case reports of serious hepatotoxicity with Garcinia.
Serotonin-toxicity risk — case reports of serotonin syndrome when Garcinia/HCA is combined with SSRIs or other serotonergic drugs.
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
Garcinia Cambogia has an evidence score of 3.5/10 — emerging evidence based on 24 indexed studies, including 2 meta-analyses. 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 39943939.
Dosing for Garcinia Cambogia: 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.
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. Reported side effects include clinically apparent liver injury, including severe cases, has been reported. Incidence is not established (LiverTox, and the DILIN case series, PMID 34400337), serotonin-related effects (with SSRIs), GI upset, headache. How often they occur is not established for all of them. Use caution if any of these apply to you: Liver disease; Use with hepatotoxic drugs; SSRIs/serotonergic drugs (serotonin syndrome risk).
Green Tea Extract
Likely helpsConcentrated catechins from green tea, studied for metabolism, fat oxidation, blood lipids and antioxidant markers.
Glucomannan
Likely helpsAbsorbs up to 50x its weight in water, creating strong satiety — supports weight loss, blood sugar regulation, and cholesterol reduction.
Gymnema Sylvestre
Too few graded studiesAn Ayurvedic herb studied for supporting blood-sugar control and for temporarily blunting sweet taste and sugar cravings.
Artichoke Extract
Probably helpsCynarin and chlorogenic acid stimulate bile production, support liver function, and modestly lower cholesterol levels.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 24 studies · how we score · editorial policy
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.
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