Overview
- Stiftung Warentest examined 25 products and found a majority exceed safe supplement levels, repeating concerns first raised in a 2017 test.
- Only two low‑dose options were judged suitable, including a 400 IU daily vitamin D juice and GSE’s Vitamin D compact tablets at 200 IU.
- Five products were rated not suitable because long‑term use at their doses could cause kidney damage, and many others were only partly or weakly suitable.
- The overall ratings were two suitable, five suitable with restrictions, 13 of limited suitability, and five not suitable, with labeling and health claims also scrutinized.
- Authorities highlight that many people do not need extra vitamin D, recommend blood testing when deficiency is suspected, and caution against depot or very high single doses linked to dosing errors and increased falls in older adults.