Why does cilantro taste like soap? Meet OR6A2

Genetics explainer · Updated June 2026

Why cilantro smells soapy

Cilantro (the leaf of the coriander plant) is rich in a family of aroma molecules called aldehydes. The same class of compounds shows up in soaps and some lotions — which is exactly why, to a certain group of people, fresh cilantro and hand soap register as the same smell.

Most of what we call "taste" is actually smell. When you chew cilantro, aroma compounds drift up the back of your throat to the olfactory receptors in your nose. If your receptors are especially tuned to those soapy aldehydes, that's the note that dominates — overpowering the bright, citrusy flavor everyone else is enjoying.

The OR6A2 connection

The leading genetic clue is a variant called rs72921001, which sits near OR6A2 — an olfactory (smell) receptor gene. OR6A2 is thought to bind aldehyde compounds, the very molecules responsible for cilantro's soapy edge.

A large study of consumer genetics found that people carrying a particular version of this marker were more likely to report disliking cilantro and describing it as soapy. In broad terms:

A few honest caveats. The effect is real but modest — this single variant explains only a slice of who dislikes cilantro. Plenty of soap-tasters carry the "non-soapy" genotype, and plenty of cilantro lovers carry the "soapy" one. Culture, exposure, and habit all weigh in. If you grew up eating cilantro in salsa, pho, or chutney, you may never have registered the soap at all.

TAS2R38: the bitter-taste gene

OR6A2 is about smell. Its famous cousin, TAS2R38, is about genuine taste — specifically, bitterness.

TAS2R38 is a bitter-taste receptor gene. Certain variants are associated with how strongly you perceive a class of bitter compounds (the ones researchers test using harmless chemicals called PROP and PTC). People sort roughly into three groups:

• "Super-tasters" — perceive these bitter compounds intensely. Broccoli, Brussels sprouts, kale, grapefruit, and black coffee can taste aggressively bitter.
• "Tasters" — the middle ground, where most people land.
• "Non-tasters" — barely register the bitterness at all, and may happily eat vegetables others find harsh.

This is why a dinner table can split over the same plate of greens. It isn't fussiness — the broccoli genuinely tastes different in different mouths. Some research has explored whether bitter-taste sensitivity nudges vegetable preferences and eating habits, but as always, the link is a tendency, not a rule. Many self-described super-tasters love their vegetables; they just season more boldly.

Tendencies, not destiny

Here's the reassuring part: taste genes load the dice, they don't decide the game.

People who initially find cilantro soapy often report the perception fades with repeated exposure — the brain learns to file it under "herb" rather than "soap." Cooks have a trick, too: crushing or finely chopping cilantro releases enzymes that break down the soapy aldehydes faster, mellowing the flavor. And bitter-veg aversion softens with how you cook: roasting, salt, fat, and acid all tame the bitterness that super-tasters notice most.

So your genotype is a starting point, not a sentence. It explains why your reaction differs from your friend's — not whether you're allowed to enjoy guacamole.

Find your own taste markers

OR6A2 and TAS2R38 are exactly the kind of low-stakes, genuinely fun markers hiding in your raw DNA file. Knowing them won't change your health, but it might settle a long-running argument about the salsa.

• See the full breakdown in our gene library: OR6A2 cilantro taste.
• Look them up yourself with the DNA explorer — it reads your file right in your browser, with nothing uploaded.
• Browse more trait explainers on the Quanome blog.

Frequently asked questions

Why does cilantro taste like soap to some people?

Cilantro contains aldehyde compounds that smell soapy. A variant near the OR6A2 olfactory-receptor gene is associated with detecting those aldehydes more strongly, so people carrying it are more likely to perceive cilantro as soapy rather than fresh and citrusy.

What gene makes cilantro taste like soap?

The most-studied marker is rs72921001, a variant near OR6A2 — a smell receptor tuned to aldehyde compounds. It's associated with the soapy perception, though it's only part of the story and doesn't fully explain who dislikes cilantro.

What does the TAS2R38 gene do?

TAS2R38 is a bitter-taste receptor. Variants in it are associated with how strongly you perceive certain bitter compounds, which is why some people find broccoli, Brussels sprouts, or black coffee much more bitter than others do.

Can you train yourself to like cilantro?

Possibly. Genetics is a tendency, not a verdict. Many people who initially find cilantro soapy report it fades with repeated exposure, and crushing or chopping the leaves changes the aroma compounds. Taste is part genes, part habit.