What should I know about MTHFR Check?

The CYP2C19 *2 variant (rs4244285) is a common loss-of-function allele, found in ~14.5% of Europeans. It reduces the activity of the CYP2C19 enzyme, affecting metabolism of drugs like clopidogrel, omeprazole, and some antidepressants. Carriers are classified as poor metabolizers, which can lower the efficacy of clopidogrel (e.g., after stent placement) and alter response to proton pump inhibitors. However, your test is a direct-to-consumer (DTC) product, not clinically validated for dosing decisions. Even clinically approved pharmacogenetic tests require professional interpretation. Do not change any medication based solely on this result. Consult a healthcare provider who can integrate your full medical history and other factors. Evidence: GWAS frequency data; clinical utility for DTC remains limited.