Is FUT2 useful for fertility?

Based solely on the provided context, there is no direct evidence linking FUT2 to fertility. The context covers MTHFR, VDR, ACTN3, microbiome tests, and polygenic risk scores, but not FUT2. Outside this context, FUT2 (secretor status) is known to influence gut microbiome composition and vitamin B12 absorption, and some observational studies have explored its role in fertility (e.g., cervical mucus quality), but the evidence is weak and inconsistent. Without robust, context-grounded data, FUT2 cannot be considered a clinically useful marker for fertility. Consumers should be cautious of DTC tests that overstate such associations.