Being told you have “bad eggs” or need donor sperm doesn’t explain why your karyotype, embryo testing, and labs all look “normal” on paper. Many so‑called “genetic” failures are actually metabolic, mitochondrial, and immune problems that quietly affect how eggs, sperm, and embryos grow, divide, and activate their DNA. If your embryos keep arresting before blastocyst, we dig into the hidden factors standard genetic tests miss.