3 ms·
If the sun is very low in the sky, no UVB radiation will reach you. The body needs the UVB radiation in order to produce vitamin D. I think a general rule of th
by jensen123 11y ago
If the sun is very low in the sky, no UVB radiation will reach you. The body needs the UVB radiation in order to produce vitamin D. I think a general rule of thumb is that if your shadow is longer than you are, then there is no UVB.