Andrew Huberman· PhD
when we look at the sun we are seeing about 38% of that energy coming from the sun is in the visible spectrum there's a whole another 52% of the photons coming from the Sun in the infrared spectrum and on the other end on the ultraviolet side this is the part we have no problem understanding because we know that ultraviolet B light comes into our skin and it's high energy so it's able to actually move the bonds on these uh cholesterol derivatives in order to make vitamin D