Evidence check: Nährstoffcheck in the context of fertility

A nutrient check in the context of fertility often claims to identify deficiencies via blood or DNA analysis to improve conception chances. However, the scientific basis is weak. While certain nutrients (folate, vitamin D, zinc, omega-3s) are relevant for fertility, a generic check does not replace clinical evaluation. Evidence for such tests is mostly marketing or mechanistic, lacking robust randomized trials showing benefit. Blood nutrient levels can fluctuate daily and may not reflect long-term status. DNA-based nutrient checks have even less evidence, as genetic variants typically have small effect sizes. For a thorough fertility assessment, hormone panels (AMH, FSH, etc.), semen analysis, and gynecological workup are essential. A nutrient check may be complementary but should not drive decisions alone. Beware of exaggerated claims and self-supplementation without medical guidance.