Supplement analysis backed by scientific evidence · PT

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Limited evidenceHeart & metabolic

Black Garlic

Garlic slowly heat-aged until it turns dark and sweet, sold for cholesterol and antioxidant effects. Human trials are few and mostly small or uncontrolled; the broader garlic literature is stronger than the black garlic literature specifically.

Evidence last reviewed: August 2026

What the science says

  • Lipid profile Limited evidence

    A randomized triple-blind trial of aged black garlic in grade I hypertension found shifts in lipoprotein subclass composition rather than clear reductions in standard cholesterol values. A separate before-and-after study in hypercholesterolaemic subjects reported lipid changes but had no control group.

  • Endothelial function Limited evidence

    The same before-and-after study reported improved endothelial measures after black garlic consumption. Without randomisation or a placebo arm, the result cannot be separated from diet and seasonal variation.

  • Cardiovascular risk factors from garlic generally Moderate evidence

    An updated systematic review and meta-analysis of randomized trials found garlic supplementation modestly improves blood pressure and some lipid markers in adults. Those trials mostly used powdered or aged garlic, not black garlic, so the finding transfers only loosely.

Dosage & safety

Studied doseHuman studies used roughly 2–6 g of black garlic daily (about 1–2 cloves) or 250–1000 mg of concentrated extract, for 6–12 weeks.
SafetyA food, generally very well tolerated and much gentler on the stomach than raw garlic. Aging reduces allicin, so the antiplatelet effect is likely smaller, but caution with anticoagulants is still sensible before surgery. It is higher in sugars than raw garlic.

Scientific references

Where to buy

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