welche vitamine fehlen bei haarausfall — what symptoms are typical?

Hair loss can stem from genetics, hormones, stress, or nutrient deficiencies. Vitamins and minerals commonly linked to deficiency-related hair loss include biotin (B7), vitamin D, iron, zinc, and selenium. Biotin supports keratin production, but true deficiency is rare except in specific diets or malabsorption. Low vitamin D is associated with non-scarring alopecia, though evidence for causation is moderate. Iron deficiency (common in women with heavy menstruation) can cause diffuse thinning, as can zinc deficiency. Typical deficiency symptoms include fatigue, brittle nails, pale skin, or lowered immunity. However, not all hair loss is due to deficiencies. A blood test by a physician is recommended before supplementing. Consumer DNA or microbiome tests (e.g., from MyBody-X) cannot diagnose specific vitamin deficiencies – they only offer indirect clues about genetic predispositions or gut bacteria affecting nutrient absorption. Overall evidence for vitamin supplements against hair loss is mixed; a balanced diet usually suffices.