Is APOE useful for fertility?

Whether APOE is useful for fertility is not well supported by current evidence. APOE is primarily studied for cardiovascular disease and Alzheimer's risk. Some observational studies suggest that the APOE ε4 allele may be associated with earlier menopause or reduced ovarian reserve, but effect sizes are small and findings are inconsistent. In clinical fertility practice, APOE is not a standard biomarker. The evidence is mostly mechanistic or from observational studies, not from randomized trials. Moreover, APOE testing is often marketed in the context of heart or brain health, not fertility. For individuals seeking fertility insights, established markers like AMH, FSH, or validated genetic panels are more appropriate. Relying on APOE alone for fertility decisions is not evidence-based and may lead to unnecessary worry or false reassurance.