welche nährstoffe fehlen bei haarausfall — what can you do yourself?

The question of which nutrients are missing in hair loss is valid, but the answer is not one-size-fits-all. The provided context contains no specific studies or guidelines on hair loss and nutrients. Generally known potential deficiencies include iron (especially in women), zinc, biotin, vitamin D, and omega-3 fatty acids. However, a deficiency should always be confirmed by a doctor via blood test before high-dose supplementation. Many 'hair vitamins' sold online are overpriced and lack evidence. A balanced diet rich in vegetables, fruits, nuts, and healthy fats is sensible. For persistent hair loss, seeing a dermatologist is recommended to rule out other causes like hormonal imbalances or autoimmune conditions. The evidence for individual supplements is mostly weak to moderate. High self-dosing can even be harmful (e.g., vitamin A toxicity). Bottom line: no miracle cure, but a healthy diet and medical check-up are the best steps.