Can B12 help with fertility?

The question of whether vitamin B12 can help with fertility is nuanced. B12 deficiency is linked to elevated homocysteine, which is associated with ovulatory infertility, recurrent pregnancy loss, and reduced oocyte quality. In men, B12 deficiency may impair sperm parameters. However, evidence for a direct fertility-enhancing effect of B12 supplementation in individuals without deficiency is limited. Most studies are observational or small-scale. In clinical practice, B12 is often included in a broader nutritional optimization strategy, but not as a standalone fertility treatment. The provided context does not contain specific studies or products addressing B12 and fertility, so this answer relies on general medical knowledge. Testing B12 levels before supplementation is advisable. Caveat: high-dose B12 without deficiency has no proven benefit and may mask other conditions.