What is vitamin D?
What is vitamin D?
What is vitamin D?

What is vitamin D?

Vitamin D is sometimes called the “sunshine vitamin” because it is the sun that enables us to make it.


Vitamin D is sometimes called the “sunshine vitamin” because it is the sun that enables us to make it. It is the action of ultraviolet B radiation, UVB, hitting our bare skin, which triggers the synthesis of vitamin D. But these are also the UVB, although they represent only a tiny fraction of solar radiation, which cause sunburn stroke. And this is a chance. Indeed, continuing to sun exposure after the onset of skin redness signing the beginning of the burning of the skin, has no interest regarding the synthesis of vitamin D.

Passed a daily dose, this synthesis is no longer to prevent any risk of poisoning. As against this redness is a terrific signal that our skin can no longer bear to be in the sun and it is high time to protect it by clothes or get in the shade.

If we do not hear this signal and that it does not protect her skin, you take risks for his health: Prolonged sun exposure causes skin aging and increases the risk of skin cancer. And without any benefit for the synthesis of vitamin D. By its mechanism synthesis, vitamin D reminds us that it’s all about dosing. The sun is good for health, especially because it allows to synthesize vitamin D, but do not abuse it and be careful that the skin does not redden.

In summary, to sunbathe:

We must expose their skin to the sun as long as it does not blush as widely as possible, and every day when possible
Remember that the more you are at altitude and UVB are powerful.
Protect yourself in the most dangerous situations for the skin (ski, boat, noon and tropical regions) with sunscreen or clothing which prevent the synthesis of vitamin D, or in the shade of a parasol or a tree that allows moderately.
When making a dosage of vitamin D?

The right time: It can be interesting to make a dosage of vitamin D in the blood fall, in November, when vitamin D accumulated during the summer months starts to run out. To measure what its minimum levels of vitamin D, the best time is spring, before the return of the first sun exposure. In practice, I recommend vitamins dosing regardless of the months of the year if you have a health problem, and outside was at large otherwise. Finally, the period to which the assay is performed may be intellectually interesting, but the most important is to run this assay.

At what frequency ?

It is prudent to make a dosage once a year even if we lack some vitamins , and that supplementation with one or two doses winter is sufficient, of course away from the intake of vitamin D. If dose the rate is normal spontaneously, which is rare, the dosage may be in a slightly more spaced.

If a severe deficit, closely spaced doses are required. It is best to make a dosage after three months of supplementation to ensure that it is effective then twice a year to check that it remains well suited to the individual’s needs.

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