What to watch with COMT and fertility?

COMT (catechol-O-methyltransferase) is a key enzyme in estrogen metabolism. The common Val158Met variant (rs4680) alters enzyme activity: the 'low activity' Met/Met genotype leads to slower estrogen breakdown, which has been associated with altered risk for hormone-sensitive conditions like endometriosis and PCOS—both relevant to fertility. However, the evidence is primarily observational (human-moderate) and not strong enough to base fertility decisions solely on a COMT genotype. Other genetic factors (e.g., ESR1, CYP1A2, MTHFR) and non-genetic factors (diet, stress, hormone levels) are more influential. A hormone panel (like the Hormon & VitalCheck for Women) can measure estradiol, progesterone, cortisol, and TSH, but does not include COMT. Caution: direct-to-consumer DNA tests for fertility are not a substitute for clinical evaluation. The clinical utility of COMT testing for fertility remains limited and should be interpreted only in a broader context.