Aged garlic extract (AGE) is made by soaking raw garlic cloves in aqueous ethanol solution for up to 20 months at room temperature, a process that converts harsh, unstable sulfur compounds into stable, highly bioavailable ones like S-allylcysteine. The result is a virtually odorless supplement with a richer antioxidant profile than raw garlic. It's one of the most clinically studied forms of garlic, with a strong track record specifically in cardiovascular research.

AGE's primary active compound, S-allylcysteine, supports healthy blood vessel function by encouraging the production of nitric oxide, which helps relax and widen blood vessels — a key reason it helps lower blood pressure. It also reduces oxidation of LDL cholesterol (making it less likely to stick to artery walls), calms low-grade inflammation, and supports the immune system by activating natural killer cells and other immune defenders.

Capsules and tablets are the most common and practical forms, typically standardized to a guaranteed SAC content per dose. Kyolic is the most clinically studied brand and the one most frequently used in trials. Liquid extracts exist but have a stronger flavor and less consistent standardization. Powder forms are used in some functional food products.

• High blood pressure
• High cholesterol and triglycerides
• Arterial stiffness and plaque buildup
• Weak or sluggish immune system
• Chronic inflammation
• Blood sugar regulation
• Oxidative stress and cell damage
• Gut health and microbiome balance
• Cold and flu severity

• Progression of subclinical coronary artery plaque (supported by imaging trials)
• Recurrent colds and upper respiratory infections
• Oxidative damage to LDL cholesterol (a key step in arterial plaque formation)

• Raw garlic cloves — The original source — contains allicin and precursor sulfur compounds that partially convert to the same beneficial organosulfurs found in AGE, though in less stable and less bioavailable forms.
• Black garlic — Fermented/heat-aged garlic that develops many of the same stable organosulfur compounds as AGE, including elevated S-allylcysteine levels and strong antioxidant activity — the closest food analog to AGE.
• Roasted garlic — Cooking mellows garlic's harsh compounds and increases some antioxidant polyphenols, though allicin is largely destroyed — still delivers meaningful organosulfur benefit with a gentler stomach impact.
• Leeks — A close botanical relative of garlic in the Allium family, containing organosulfur compounds and polyphenols that support similar cardiovascular and antioxidant pathways.
• Onions — Another Allium family member rich in quercetin and organosulfur compounds — supports cardiovascular and anti-inflammatory pathways that overlap substantially with AGE's benefits.

• Mild digestive discomfort in sensitive individuals (rare)
• Slight garlic aftertaste at higher doses
• Increased bleeding time — relevant before surgery or if on blood thinners
• Allergic reaction in people with Allium allergy (uncommon but possible)
• Headache reported occasionally at high doses

• Recommended daily: 600–1,200 mg of standardized aged garlic extract daily (most clinical trials use 1,200 mg/day for cardiovascular outcomes). For immune support, 2,400 mg/day has been used in some trials.
• Best time of day: Morning with breakfast is most practical and consistent with how most trials dosed participants. Splitting the dose (e.g., morning and evening) may improve tolerability at higher doses.
• With or without food: Take with food — it improves tolerability and is consistent with clinical trial protocols. Taking on an empty stomach occasionally causes mild nausea in sensitive individuals.
• Time to effect: Immune effects within 2–4 weeks; meaningful blood pressure and cholesterol changes typically require 8–12 weeks of consistent daily use.
• How long to take it: Suitable for long-term daily use — most cardiovascular benefits require sustained supplementation. No evidence supports the need for cycling breaks with AGE. Reassess with a healthcare provider every 6–12 months.