Handy rule of thumb for when the sun is strong enough to stimulate the body to produce vitamin D.
If your shadow is longer than your measured height it's too weak - no vit D production. In other words, the sun must be from 45° to 90° in the sky for you to be producing vitamin D
Handy rule of thumb for when the sun is strong enough to stimulate the body to produce vitamin D.
If your shadow is longer than your measured height it's too weak - no vit D production. In other words, the sun must be from 45° to 90° in the sky for you to be producing vitamin D
how much skin should be exposed? short sleeves? shorts?
Shorts and t-shirt exposure of skin yields MDR vit D in 15 minutes, my memory.