What part of the body should you expose to the sun to synthesize as much vitamin D as possible?

Vitamin D is a fat soluble prohormoneessential for the proper functioning of the human body. Strengthens the immune system AND limits inflammation. It also improves muscle strength, promotes the absorption of calcium from the small intestine and prevents osteoporosis. The problem, is that it is quite rare (although present) in food. To synthesize it, our body needs one essential element: the sun. But do you know how to absorb the right amount of it optimally?

The forearms and hands: the absorption channels of vitamin D

On average that would be enough 10 to 15 minutes of exposure, measured 2 to 3 times a week, to fill vitamin D deficiencies. Obviously, this figure depends on age, diet, skin pigmentation and place of life. But which part of the body should be put forward to synthesize it optimally? Well, it may sound surprising to some people, but these are forearms, hands and face which absorb most of the UV rays. Knowing that it is advisable to expose yourself between 11am and 2pm

As for whether or not to apply sunscreen, dermatologists are not all in agreement on the subject. You should know that an SPF15 blocks 93% of vitamin D production, according to a study by the University of Valencia. Still, is it safe to go out for 10-15 minutes without sunscreen in the middle of summer, for example? According to a study published in the British Journal of Dermatology, and initiated by Professor Antony Young, of King’s College London, this is not an argument. And for good reason: Always protect your skin from the sun’s rays. He explains :

” Sunlight is the main source of vitamin D. Sunscreens can prevent sunburn and skin cancer, but the effects of sunscreens on vitamin D have generated much uncertainty. Our study, during a week of perfect weather in Tenerife [en Espagne, ndlr]he proved it sunscreens, also used in an optimal way to prevent burns, have allowed an excellent synthesis of vitamin D. »

We are reassured!

What if you can’t go out in the sun?

Not everyone can expose themselves to full minutes in the sun. In this case it is important to regularly check your vitamin D level (by doing a simple blood test). If the latter is low, like 80% of Westerners, as indicated by the site Health passporta general practitioner can prescribe food supplements (in capsules or vials) to be taken once a month or once every three months depending on the profiles. In any case, it remains important to consult, to avoid a decline in immunity.