Sunscreen can block the production of vitamin D from "summary" of The Vitamin D Solution by Michael F. Holick Ph.D., M.D.
Sunscreen is designed to protect our skin from harmful UV rays, but it can also block the production of vitamin D. When we apply sunscreen with a sun protection factor (SPF) of 30, for example, we can reduce the production of vitamin D by about 95%. This is because sunscreen blocks the UVB rays that are needed for our bodies to make vitamin D. In order to get enough vitamin D, it is important to balance sun protection with sun exposure. While it is crucial to protect our skin from sunburn and skin cancer, it is also essential to allow our bodies to produce an adequate am...
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