Vitamin D deficiency guidance in Europe

A health guide released on 26 July for Austria and the broader DACH region detailed vitamin D’s biological roles, identified high‑risk groups—including people with limited sun exposure, older adults, individuals with darker skin, obesity, chronic organ disease, and care‑home residents—and outlined diagnostic procedures using 25‑hydroxyvitamin D blood tests. It set an optimal serum range of 30–50 ng/mL, described severity categories from severe deficiency to potential over‑supplementation, and warned of related health risks such as bone disorders, cardiac rhythm issues, and kidney stones.

Four days later, German health experts highlighted that roughly 30 % of German adults are deficient and up to 60 % have insufficient levels. They recommended year‑round supplementation, citing benefits for bone health, muscle function, metabolism, and immunity. The German Nutrition Society suggested 800 IU daily for low‑sun exposure, while other authorities propose lower doses. Some specialists argued higher doses (4 000–5 000 IU) may be needed for certain skin types, emphasizing that excessive active vitamin D can disrupt calcium balance and should be monitored against individual blood calcium and vitamin D ratios.