welche vitamine fehlen bei haarausfall — can a DNA test help?

The question of which vitamins are missing in hair loss has no one-size-fits-all answer, as causes vary widely. Commonly discussed nutrients include iron, zinc, vitamin D, B12, and biotin – but evidence shows that deficiency is only present in a subset of individuals, and supplementation without proven deficiency is usually ineffective. Can a DNA test help? Only to a limited extent: it can detect genetic variants associated with hair loss (e.g., in the androgen receptor gene), but it cannot measure current vitamin or mineral levels. Blood tests (serum levels) remain the gold standard for identifying actual deficiencies. The evidence for DNA-based recommendations in hair loss is weak to mechanistic; many consumer tests overstate their utility. My advice: if you experience persistent hair loss, see a doctor to check iron, ferritin, vitamin D, zinc, and thyroid function – rather than spending money on a DNA test that does not assess nutrient status.