What this means

OR6A2 codes for an olfactory receptor that detects certain aldehydes — the same family of compounds that gives soap and some cleaning products their smell, and that cilantro leaves produce in abundance. A common variant near OR6A2 is associated with whether people describe cilantro as fresh and citrusy or as oddly soapy. The effect is real but small: people who grow up eating cilantro frequently often stop noticing the soap note, whatever their genotype says.

OR6A2 is a smell receptor that picks up a chemical family called aldehydes — the same group that gives soap and some cleaners their smell, and that cilantro leaves give off in abundance. A common DNA change near this gene tilts whether you describe cilantro as fresh and citrusy or as oddly soapy. The effect is real but small: people who grow up eating cilantro often stop noticing the soap note no matter what their genes say.

Caveats

• The effect size is small. Exposure and cuisine matter at least as much as genetics.
• Many "cilantro haters" have no detectable variant at this locus.
• This is a preference signal, not a verdict — many people learn to love cilantro regardless.
• The trait is reported across populations but most studied in European cohorts.

References

• Eriksson et al. — A genetic variant near olfactory receptor genes influences cilantro preference (Flavour, 2012)
• Mauer & El-Sohemy — Prevalence of cilantro (Coriandrum sativum) disliking among different ethnocultural groups (Flavour, 2012)