Publication date: Jul 25, 2025

The researchers then compared these groups to see if the risk of infection and hospitalisation due to COVID-19 was higher among people with low vitamin D levels. However, low vitamin D levels did not make people more likely to catch the virus in the first place. Those with levels between 25 and 49 nmol/L were classified as insufficient, and individuals with 50 nmol/L or more were considered to have normal or healthy levels. They divided participants into three groups based on their vitamin D levels. People with less than 25 nanomoles per litre (nmol/L) of vitamin D were considered deficient.

Semantics