Can MTHFR help with fertility?

Can MTHFR help with fertility? The short answer: indirectly, and only in specific contexts. MTHFR variants (C677T, A1298C) reduce the enzyme's efficiency, potentially raising homocysteine levels. Elevated homocysteine is a known risk factor for recurrent pregnancy loss, implantation failure, and poor sperm quality. However, the evidence is moderate—mostly observational and not consistently replicated. A DNA test can identify predisposition, but it does not diagnose a deficiency or guarantee fertility issues. The key actionable step is measuring blood homocysteine and B-vitamin status. If homocysteine is high, supplementation with active folate (5-MTHF) and B12 may help, but only if a true metabolic block exists. Many DTC companies overhype MTHFR as a 'fertility gene,' ignoring that lifestyle, diet, and other genetic factors play larger roles. Caveat: MTHFR testing alone is not a fertility treatment; it should be part of a comprehensive workup with a healthcare provider.