Lay opinion vs evidence: Vitamin D Senioren

Lay opinion often holds that high-dose vitamin D is universally beneficial for seniors—boosting immunity, mood, and cardiovascular health. However, the scientific evidence is more nuanced. For bone health and fall prevention in older adults with confirmed deficiency, there is good evidence (human-moderate). For other outcomes like cardiovascular protection or cancer prevention, randomized controlled trials show mixed or null results. Moreover, excessive intake can cause hypercalcemia and kidney damage. Routine screening of all seniors is not recommended; targeted testing of 25(OH)D levels is advised for at-risk groups (e.g., nursing home residents, dark skin, limited sun exposure). Dosing should be individualized, typically 800–2000 IU/day, not higher without medical supervision. In summary: lay opinions often overestimate benefits and underestimate risks; evidence-based medicine recommends targeted, need-based supplementation.