Heart/Immunity

Garlic

Culinary bulb rich in sulfur compounds that modestly lowers blood pressure and LDL cholesterol in adults with elevated cardiometabolic risk.

Garlic

Culinary bulb rich in sulfur compounds that modestly lowers blood pressure and LDL cholesterol in adults with elevated cardiometabolic risk.

score

evidence

Caution

risk

Proven Benefits

01Lowers blood pressure

02Lowers LDL cholesterol

03May lower total cholesterol

04May improve endothelial function

05May lower fasting glucose

06May reduce common cold incidence

Chemical Forms

Recommended

Aged garlic extract
Allicin-standardized garlic powder
Enteric-coated garlic powder

Avoid

Odorless garlic tablets without allicin standardization
Non-enteric-coated garlic powder with unknown alliinase activity
Garlic oil capsules (less consistent BP/lipid evidence)

Expert Note

Aged garlic extract has the most consistent human evidence and contains stable S-allyl-cysteine. For powder-based products, allicin standardization and enteric coating help preserve active sulfur compounds; generic odorless tablets often deliver unpredictable amounts. Garlic oil is less consistently studied for blood pressure and lipid outcomes.

Protocol

Amount

600-1200 mg

Frequency

Once daily or divided into 2 doses

When

With meals to reduce stomach upset and breath odor.

Condition-Based Dosing

Adults with mild hypertension or elevated LDL/total cholesterol

600-1200 mg daily of aged garlic extract or standardized garlic powder— Short-term studies have used up to 2400 mg/day, but the benefit is modest.

Adults with prediabetes or elevated fasting glucose

600-1200 mg daily for 8-12 weeks— Effects are small and more likely when baseline glucose is elevated.

Adults with frequent colds

600-1200 mg daily through cold season— Evidence is stronger for prevention than for treating an active cold.

Safety & Limits

Upper Safe Limit

No official UL; practical ceiling is about 2400 mg/day of aged garlic extract or equivalent in short-term studies.

Cycling

Safe for continuous use

Contraindications

Warfarin or other anticoagulants — additive bleeding risk

Antiplatelet drugs like aspirin or clopidogrel — additive bleeding risk

Hemophilia or other bleeding disorders — may worsen bleeding

Upcoming surgery — stop 1-2 weeks before to reduce bleeding risk

Saquinavir or other HIV protease inhibitors — may lower drug concentrations

Avoid Combining With

✕Warfarin, aspirin, clopidogrel, and other blood thinners (additive bleeding risk; avoid close to surgery)
✕Saquinavir or other HIV protease inhibitors (may reduce drug levels)

Updated Invalid Date