Aged garlic: why it takes 20 months to get right

Fresh garlic is sharp, pungent, and gone from the chopping board in seconds. Aged garlic extract (AGE) is the opposite — mellow, syrupy, and odourless. The reason for that difference comes down to one thing: time. Genuine aged garlic extract takes up to 20 months to produce, and that long timeframe isn't a marketing detail — it's what makes it work.

Why 20 months, not 20 days

Shorter ferments exist — a few weeks will soften garlic's flavour, and three to six months will mellow it further. But these are only partway there. Traditional aged garlic extract is matured for 10 to 20 months in a diluted alcohol or water-based solution, at a steady, cool temperature (around 15–22°C). That extended, unhurried timeframe is what fully converts garlic's harsh compounds into the stable, beneficial ones aged garlic is valued for. Rush it, and you get milder-tasting garlic. Give it the full 20 months, and you get a genuinely different product.

What happens over those 20 months

Allicin breaks down. Raw garlic's bite comes from allicin, released when a clove is cut or crushed. Allicin is naturally unstable — over the long ageing period it fully converts into milder sulphur compounds, which is why properly aged garlic has no raw sting and won't linger on the breath.

S-allyl-cysteine (SAC) develops. This is the real payoff of the full ageing period. As allicin breaks down, it gives rise to SAC — a stable, highly bioavailable compound the body can actually absorb and use. It's SAC, not allicin, that most of the research into aged garlic's role in cardiovascular support and antioxidant activity has focused on. Short-ferment garlic simply hasn't had time to develop meaningful levels of it.

Texture and colour shift. Cloves soften as their cell structure breaks down, and the colour deepens toward amber as ageing progresses.

The takeaway

More ageing time isn't a nice-to-have — it's the whole point. A few weeks makes garlic milder; 10–20 months is what transforms it, converting allicin into the stable SAC compounds behind aged garlic's traditional use. When you're choosing an aged garlic product, the ageing period is worth checking — it's the clearest sign of whether you're getting genuinely aged garlic extract or simply garlic that's had a head start.

This article is for general information only and isn't intended as medical advice. If you're considering adding garlic supplements to your routine, particularly alongside medication, it's worth having a chat with your healthcare provider first.