Vitamin D is the only one, of the 13 vitamins necessary for humans, to be synthesized by the body from cholesterol with the help of the sun.
It is also found in certain foods but in very small quantities, except in the liver of oily fish.
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Experts believe that exposure of the hands and face for thirty minutes a day is sufficient to meet vitamin D requirements, although deficiencies may appear in winter and early spring.
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Vitamin D is essential all year round, especially for the functioning of muscles, skeleton, neurons and the immune system.
Globally, the question of a deficit risk arises for all modern humans, who spend more time indoors without actually converting to cod liver oil daily in winter.
Very variable needs
The complexity of vitamin D metabolism and regulation, as fine as a hormone, makes most blood tests unreliable.
It would also seem
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