Garlic
Also known as: Allium sativum, allicin, aged garlic extract, garlic extract, S-allyl-L-cysteine, black garlic
Effective Dosage
500–1000 mg extract daily (standardized to 2–3 mg allicin) based on study doses
What the Science Says
Garlic is a culinary plant whose active compound, allicin, drives most of its health effects. Clinical trials show it can meaningfully lower blood pressure, reduce LDL and total cholesterol, cut triglycerides, and improve fasting blood sugar — particularly in people with metabolic risk factors like prehypertension or metabolic syndrome. Effects are typically seen within 4–8 weeks at doses of 500–1000 mg standardized extract daily, and it appears to work partly by boosting nitric oxide, a molecule that relaxes blood vessels.
What It Doesn't Do
Won't replace blood pressure or cholesterol medication on its own. No solid evidence it directly burns fat or causes meaningful weight loss in healthy people. The idea that smelling garlic improves health is not supported by human data. No proven cancer treatment in humans based on the provided studies. Topical allicin gels for obesity are experimental mouse-only research — not ready for human use.
Evidence-Based Benefits
Garlic has been shown to support immune function and may have cardiovascular benefits, such as reducing blood pressure and cholesterol levels. Its active compounds, particularly allicin, are believed to contribute to these effects.
Strong EvidenceEffective at: 600-1200 mg daily
Source: auto-research
Absorption & Bioavailability
Moderate — allicin is unstable and degrades quickly; freeze-dried and standardized extracts appear to preserve bioavailability better than raw garlic; encapsulation and formulation significantly affect how much active compound reaches the bloodstream
Red Flags to Watch For
- Many garlic supplements are not standardized for allicin content — check the label for mg of allicin, not just mg of garlic powder
- Garlic can thin the blood; avoid high-dose supplements before surgery or if taking anticoagulants like warfarin
- Combining garlic with erectile dysfunction drugs (e.g., tadalafil) may amplify blood pressure-lowering effects — consult a doctor first
- Most studies are short-term (4–8 weeks); long-term safety and sustained efficacy data are limited
- Products claiming garlic cures cancer or reverses diabetes are making unsupported claims — no human RCT evidence for these uses in the provided data
Products Containing Garlic
See how Garlic is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-06