Myths vs facts: Nährstoffcheck and Müdigkeit

Myths vs. Facts: Nutrient Check and Fatigue A common myth is that a single nutrient test (e.g., vitamin D or B12) can pinpoint the cause of fatigue. In reality, fatigue is multifactorial: sleep deprivation, stress, mental health, physical inactivity, and thyroid function are often more influential than a single micronutrient deficiency. A vitamin D self-test measures 25‑hydroxyvitamin D, but interpretation depends on season, latitude, and supplementation. Inflammation (CRP >10 mg/L) can lower measured levels without true deficiency. Fact: A low value does not prove it causes your fatigue. Evidence for vitamin D supplementation improving fatigue in non‑deficient individuals is weak (human‑moderate). Similarly, B12 or iron deficiency can cause fatigue, but normal levels do not rule out other causes. The real value of nutrient checks is identifying genuine deficiencies for targeted treatment – not as a universal fatigue remedy. Marketing often overpromises. Recommendation: For persistent fatigue, seek medical evaluation (CBC, TSH, ferritin, vitamin D, B12) rather than relying solely on self‑tests.