welche vitamine bei müdigkeit — can a microbiome test help?

Microbiome tests can offer insights into gut health, but they are not validated for diagnosing vitamin deficiencies that cause fatigue. Fatigue has many potential causes—iron deficiency, vitamin B12 deficiency, vitamin D deficiency, or thyroid issues are common. A microbiome test measures bacterial composition, not blood vitamin levels. The evidence for using such tests to guide vitamin supplementation for fatigue is weak, mostly based on mechanistic studies or small observational data. Current medical guidelines recommend a clinical workup with blood tests (e.g., CBC, ferritin, vitamin B12, vitamin D) for persistent fatigue. A microbiome test may be complementary but does not replace standard diagnostics. Consumers should not rely solely on DNA or microbiome tests to decide on vitamin intake. The predictive power is limited, and overinterpretation can lead to unnecessary costs or inappropriate supplementation.