What should I know about vitamin b mangel?

Vitamin B deficiency (B1, B2, B6, B12, folate, etc.) commonly causes fatigue, anemia, neurological issues, or skin changes. Causes include inadequate intake (e.g., vegan diet without supplementation), malabsorption (e.g., gastrointestinal disorders), or medications (e.g., metformin). Diagnosis requires blood tests – a DNA test alone cannot confirm deficiency. While genetic variants (e.g., MTHFR, FUT2) can influence vitamin B metabolism, their effects are usually small and non-deterministic. MyBody-X tests do not diagnose deficiency but may indicate risk. Important: self-interpreting DNA data can lead to misguided decisions (e.g., unnecessary high-dose supplementation). If deficiency is suspected, consult a physician. Evidence: clinically established for deficiency, mechanistic for genetic influences. Caveat: marketing often overpromises.