sunscreen

This Supplement Could Cut Your Dementia Risk By 40%

FoundMyFitness

Anything that blocks UVB radiation, including sunscreen, hinders the skin's ability to produce Vitamin D3.

A typical Blueprint morning / Nov 2021

Bryan Johnson

Using Light (Sunlight, Blue Light & Red Light) to Optimize Health

Andrew Huberman

Mentioned as a product with UV protection that would block some beneficial effects of UVB, although its use for skin cancer prevention is acknowledged as important.