Let Me Scan ThatScan a product

Vitamin D3 (Cholecalciferol)

Last reviewed October 19, 2026

In plain words: Vitamin D3 (cholecalciferol) is the form of vitamin D made in skin exposed to sunlight. It is added to foods such as milk and breakfast cereals.

What the evidence review says

Vitamin D3 is the form of vitamin D the skin makes in sunlight, added to milk and cereals. The amounts in fortified foods are not the concern. Too much vitamin D from high-dose supplements is linked with high calcium levels and kidney harm; EFSA said European diets are unlikely to reach its upper level except among people taking high-dose supplements.

Fortified-food amounts are not the hazard. Too much vitamin D from high-dose supplements raises calcium in urine and then in blood, and has been linked with kidney damage. In 2023 EFSA kept its adult upper level, based on persistently high urine calcium. EFSA said European diets are unlikely to exceed the upper level except among people who regularly take high-dose vitamin D supplements.

For information only, not medical advice. Studies and agency opinions are credited to the authors and agencies who published them; they aren't affiliated with and don't endorse Let Me Scan That or any product. Report an error

This page is for general education. It is not medical advice and does not replace advice from your doctor, pediatrician, allergist or registered dietitian. Research changes; we review these pages when new evidence or rules come out. Last reviewed October 19, 2026.