welche vitamine fehlen bei müdigkeit — can a microbiome test help?

Fatigue can be linked to deficiencies in vitamin B12, vitamin D, iron (ferritin), and folate. A microbiome test (e.g., MyBody-X stool test) cannot directly measure vitamin levels. It only profiles gut bacteria, some of which may produce B vitamins or vitamin K2, but the clinical evidence for using such tests to diagnose deficiencies is weak. Standard blood biomarkers (serum B12, 25-OH vitamin D, ferritin, holotranscobalamin) remain the validated approach. Consumer microbiome tests lack clinical validation for this purpose and are often marketed with overstated claims. While the gut microbiome plays a role in nutrient absorption, a stool test alone cannot reliably identify which vitamins are missing. For persistent fatigue, consult a physician for proper lab work before investing in unproven direct-to-consumer tests.