Hydroxycitric Acid

non-nutrient/non-botanical

What is it

Hydroxycitric acid (HCA) is a derivative of citric acid found in the rinds of Garcinia cambogia (also called Malabar tamarind) and other Garcinia species. It is one of the most popular ingredients in weight-loss supplements, often paired with chromium and other minerals.

How it works

HCA is best known as an inhibitor of ATP-citrate lyase, the enzyme that converts citrate into acetyl-CoA, a key step in the synthesis of fatty acids from carbohydrates. By inhibiting this enzyme, HCA theoretically reduces the body's ability to convert excess carbohydrates into stored fat. HCA may also enhance the production of glycogen, increase satiety signals, and modestly affect serotonin levels, which has been proposed as a mechanism for appetite suppression. Human trials have produced inconsistent results. While some studies show modest reductions in food intake and small weight loss compared with placebo, larger and more rigorous trials have often failed to find clinically meaningful effects. Standardization and the calcium/potassium salt form of HCA appear to influence outcomes.

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Reduced fat synthesis (theoretical)

Grade C

Moderate evidence

HCA inhibits ATP-citrate lyase in laboratory and animal studies, but the translation to meaningful changes in human fat storage has not been clearly demonstrated.

Weight loss

Grade D

Mixed evidence

Despite extensive marketing, well-controlled clinical trials have shown small and inconsistent weight loss effects, often no different from placebo. A 2011 meta-analysis found a small effect size that may not be clinically meaningful.

Appetite suppression

Grade D

Mixed evidence

Some studies have shown modest reductions in food intake and increased satiety with HCA. Effects are small and inconsistent.

Lipid profile

Grade D

Mixed evidence

Some studies report small reductions in total cholesterol and triglycerides with HCA supplementation, but findings are inconsistent.

3 commercial forms

Garcinia cambogia extract (50-60% HCA)

Variable absorption; salt form matters

The most common supplement form. Standardization to HCA percentage indicates active content.

Calcium-potassium HCA salt

Improved bioavailability compared with free acid

A specific salt form (sometimes branded as Super CitriMax) that may improve absorption.

Garcinia cambogia powder (unstandardized)

Variable HCA content

Used in traditional preparations and some supplements; potency is unreliable.

Dosage

Studies have used 1500-3000 mg of HCA per day, divided into doses taken before meals. Standardized Garcinia cambogia extracts (50-60% HCA) typically deliver this amount in 2-4 capsules per day. There is no formal recommended intake.

When and how to take it

Most studies have used HCA taken 30-60 minutes before meals to maximize its proposed effects on food intake and fat synthesis. Doses are usually divided across the day to coincide with main meals. Take with water; some products combine HCA with chromium for added blood-sugar effects.

Food sources

FoodAmount%DV
Garcinia cambogia rind (rare in Western diets)concentrated source—
Garcinia indica (kokum)moderate HCA content—

Safety

Generally well tolerated at typical doses. Common side effects include nausea, headache, and gastrointestinal upset. There have been case reports of acute liver injury in people taking Garcinia cambogia products, sometimes in combination with other ingredients, prompting FDA warnings about some weight-loss formulas. The role of HCA specifically in these cases is unclear.

Who should be cautious

Avoid in pregnancy and breastfeeding. People with liver disease, kidney disease, diabetes, dementia (some reports of worsening symptoms), or those taking antidepressants, statins, or diabetes medications should consult a clinician before use. Discontinue if signs of liver problems develop (yellowing skin, dark urine, abdominal pain).

Interactions

HCA may interact with diabetes medications (potentially enhancing blood sugar lowering), statins (rare reports of muscle complications), antidepressants (particularly SSRIs, due to possible serotonin effects), and asthma medications. Concurrent use with hepatotoxic substances increases liver risk concerns.

Frequently asked questions

Does HCA / Garcinia really cause weight loss?⌄

Evidence is weak. Most well-controlled trials show small or no benefit beyond placebo. Effective weight management still depends primarily on diet and activity.

Is Garcinia cambogia safe for my liver?⌄

There have been case reports of liver injury linked to some Garcinia-containing products. The role of HCA itself versus other ingredients is unclear, but stop use immediately if liver symptoms appear.

Should I take HCA before or after meals?⌄

Most studies have used HCA 30-60 minutes before meals to align with its proposed effects on appetite and fat synthesis.

Can HCA replace exercise?⌄

No. Even with possible small effects on appetite, HCA does not produce meaningful weight loss without diet and activity changes.

Will HCA interact with my antidepressant?⌄

Possibly. HCA has been reported to affect serotonin pathways, and there are case reports of issues when combined with SSRIs. Consult your clinician.

References

  • Hydroxycitric acid (Wikidata) — Wikidata link
  • Hydroxycitric acid (PubChem CID 123908) — PubChem link
  • Hydroxycitric acid (ChEBI 176344) — ChEBI link

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.