What should I know about Vitamin D Senioren?

Vitamin D is particularly important for seniors because the skin's ability to synthesize vitamin D declines with age, and kidney function decreases, impairing conversion to the active form. Deficiency can contribute to increased fall risk, muscle weakness, and reduced bone density. The German Nutrition Society recommends 20 µg (800 IU) daily for those over 65 if sun exposure is insufficient. However, the evidence is mixed: observational studies link low vitamin D levels to higher mortality and fall risk, but large randomized controlled trials (e.g., VITAL, D‑Health) do not clearly support supplementation in healthy seniors without deficiency. Routine screening is not universally recommended by all guidelines. If deficiency is confirmed (25‑OH‑vitamin D < 20 ng/ml), supplementation may be beneficial, but dosing should be individualized and medically supervised, as excessive intake (e.g., > 4000 IU/day) can cause hypercalcemia and kidney damage. In summary: vitamin D is relevant but not a panacea; the benefit of supplementation depends on baseline levels and individual health status.