Search for black garlic and nearly every result will call it fermented — suppliers, retailers, recipe sites, and a fair number of ingredient specifications. It isn't. No microorganism is involved at any point. The word is wrong, it is nearly universal, and if you are putting it on a label or into a spec it is worth understanding why.
What fermentation actually requires
Fermentation is the action of living microorganisms — bacteria, yeasts, moulds — converting sugars and other compounds. Yoghurt, kimchi, miso, sourdough and beer are fermented, and each depends on a culture doing the work.
Black garlic has none of that. Fresh garlic is held at a low, controlled heat of roughly 60–80°C at 70–90% humidity for 60 to 90 days. Nothing is added, no starter culture is introduced, and nothing is alive and working inside the bulb. The changes are chemical reactions happening within the garlic itself, driven by heat, moisture and time.
A useful shorthand: fermentation is something done to an ingredient by microorganisms. Black garlic is something that happens within the ingredient given enough heat and time. The visible result is similar — transformed colour, texture and flavour — which is probably how the wrong word became standard.
Why the distinction is not pedantry
For a home cook it changes nothing. For anyone putting the product into a supply chain it changes several things:
- —Labelling. If your packaging or marketing calls it fermented, you are making a process claim about your product. Whether that matters depends on your market's rules, and it is worth checking rather than inheriting the word from a supplier's brochure.
- —Specification. A spec that says "fermented" invites questions about cultures, strains and starters that have no answer, because there aren't any. It makes your document harder to audit, not easier.
- —Supplier assessment. A supplier who describes their own process as fermentation either has not thought about it, or is repeating the market's language without controlling the process themselves. Neither is reassuring.
What to ask a black garlic supplier
The word is a useful opening question, but the follow-ups are where you learn something:
- —How long is the aging cycle, and is it the same for every batch?
- —Are temperature and humidity logged through the cycle, and will you send the record?
- —Is anything added at any stage?
- —What is the SAC specification, and do you report the measured value for my lot?
That last one separates suppliers quickly. S-allyl-L-cysteine forms naturally as the garlic ages, and it is the marker ingredient and supplement buyers specify against. A supplier selling on appearance alone will not have a number for it, because measuring it means paying a laboratory.
Rushed batches are the real quality problem
The commercial pressure in black garlic is to shorten the cycle. Aging occupies equipment and capital for two to three months, so hurrying the heat or leaning on additives turns that capital over faster. It also produces a bitter, uneven product — and it is far more common than the fermentation confusion.
The tells are visible on arrival: cloves that are unevenly coloured rather than uniformly black, mushy rather than soft, or sharp and bitter rather than sweet with the balsamic and molasses notes properly aged garlic develops. Correctly aged black garlic sits around 30–50% moisture, which is what gives it a pliable texture without being wet, and keeps 12–18 months unopened when stored properly.
How we handle it
We age for 60 to 90 days with temperature and humidity logged throughout, and we will send that aging record with the spec sheet. Every export lot is independently tested before shipment for SAC, moisture, heavy metals, pesticide residues and microbial safety, with the measured values on a Certificate of Analysis issued against your lot. If you are not sure what to look for on that document, our guide to reading a Certificate of Analysis covers it.
Minimum order is 100 kg, in whole bulbs or peeled cloves, and samples go out before any bulk order so you can assess texture and flavour yourself. The full black garlic specification lists every parameter we report.
Written by TrueOrigin Exports, a merchant exporter of Lakadong turmeric and aged black garlic. Every export lot is tested by an independent laboratory before it ships — see how that works.