High folate levels often reflect supplement use or fortified foods and do not automatically indicate disease. The clinical concern is that high folate can obscure vitamin B12 deficiency signals, which matters for neurological safety. As for the claim that “excess folic acid causes autism,” developmental outcomes are multi-factorial and cannot be reduced to a single lab value; the evidence is complex and not a one-variable story. A safer strategy is to avoid unnecessary high-dose use, follow goal-based dosing and duration, and interpret folate alongside B12 and clinical context.