welche vitamine bei müdigkeit — what can you do yourself?

When feeling fatigued, many people first think of vitamins. Deficiencies in vitamin D, B12, or iron can indeed cause tiredness. However, self-supplementation without testing is risky: vitamin D deficiency is diagnosed via blood test; B12 deficiency often occurs with vegan diets or absorption issues. Hypothyroidism or poor sleep are also common causes. What you can do yourself: eat a balanced diet rich in vegetables, fruits, whole grains; get regular outdoor exercise; improve sleep hygiene. For persistent fatigue, see a doctor for targeted testing. Evidence: vitamin D and B12 supplementation is strongly supported when deficiency exists, but not for general fatigue without deficiency. Safety note: avoid megadosing fat-soluble vitamins (A, D, E, K) as they can be toxic.