Is Nährstoffcheck useful for Fruchtbarkeit?

Based on the provided context, there is no evidence that a Nährstoffcheck (nutrient check) from MyBody-X is useful for fertility. The context does not contain any specific data linking such a test to fertility outcomes. MyBody-X tests are marketed as lifestyle products without medical claims. The few genetic variants mentioned (e.g., NQO1, FOXO3, CLOCK) have weak, non-clinical associations with general health, not fertility. Microbiome tests from MyBody-X are described as lacking clinical validation. For fertility, established medical factors (hormones, cycle, sperm quality, lifestyle) are far more important than a broad nutrient check. Such a test might provide supplementary information but should not guide medical decisions. Evidence grade: unclear/marketing. Caution: Do not change diet or supplements without consulting a physician, especially when trying to conceive.