Can consuming too much vitamin D be harmful?

In France, the Esteban study conducted in 2015 revealed that a third of the adult population had a vitamin D deficiency, with levels below 50 nmol/L . However, a vitamin D deficiency is associated with an increased risk of cancer, cardiovascular disease, diabetes, autoimmune diseases, and depression .

Therefore, while supplementation is often beneficial, it should ideally be tailored to each individual’s specific needs. A preliminary blood test would allow for adjusting intake and avoiding any risk of unnecessary excess.