Signs that your body needs vitamin D and how to get it

4. You have dark skin

The pigmentation of your skin is like a natural sun protection. When you apply a sunscreen 30 times thicker, it reduces the skin’s ability to synthesize vitamin D from sunlight by 97%.

It’s the same if you have dark or black skin.

A person with very dark skin needs ten times more sunlight to synthesize the same amount of vitamin D as a light-skinned person.