welche mineralien braucht der körper — when to see a doctor?

The question about which minerals the body needs and when to see a doctor is important, but the provided context does not contain specific information on minerals or clinical thresholds. Generally, the body requires minerals such as calcium, magnesium, potassium, sodium, iron, zinc, iodine, and selenium in appropriate amounts. A doctor should be consulted if you experience persistent symptoms like fatigue, muscle cramps, heart palpitations, brittle nails, or hair loss – these may indicate a deficiency. Medical evaluation is also advisable during special life stages (pregnancy, older age, competitive sports) or with chronic conditions (kidney disease, Crohn's disease). Direct-to-consumer lab tests for minerals often provide only a snapshot and are not sufficient for diagnosis. Evidence for routine mineral supplementation without a confirmed deficiency is weak; overdosing (e.g., iron or selenium) can be harmful. Therefore, if you suspect a deficiency or are considering supplements, always consult a doctor. Evidence level: practice (general medical recommendation).