Myths vs facts: FUT2 and Fruchtbarkeit

Regarding myths vs facts about FUT2 and fertility, the provided context contains no information on this topic. In general, FUT2 (fucosyltransferase 2) determines secretor status—whether blood group antigens are present in body fluids. Some research suggests links to vitamin B12 absorption and gut microbiome composition, which could indirectly affect fertility. However, the evidence is weak, mostly from GWAS with small effect sizes. Consumer DNA tests often overstate such associations. The fact is that fertility is multifactorial (age, hormones, lifestyle, partner factors). A single gene like FUT2 has no diagnostic or predictive value. Anyone with fertility concerns should consult a healthcare professional rather than rely on direct-to-consumer genetic tests. The evidence level is best described as 'unclear'.