Vitamin D is that particular substance that the body takes not only thanks to certain foods, but also thanks and above all to the "contact" of the sun's rays with the skin.

It is an essential vitamin, important for the healthy growth of the body, to strengthen bones and the immune system .

An essential vitamin for those suffering from certain diseases, such as certain autoimmune diseases, psoriasis, hypertension or multiple sclerosis, as it contributes to the absorption of calcium and the maintenance of the correct levels of phosphorus in the body.

If you put a filter on the skin however, like that contained in many sunscreens, vitamin D is no longer formed. Hence, on this point, the research of Dr. Holick, one of the major - and controversial - experts in vitamin D, which would have created a sunscreen that would even stimulate the production of vitamin D, we find out what it is.

Dr. Holick and the findings on vitamin D

Dr. Michael Holick, controversial and controversial practitioner, author of the book " The Vitamin D Solution " is a researcher and professor of medicine, physiology and biophysics and was director of a distinguished medical clinic in Boston.

The research he conducted for years, as he explains in his homonymous site, is linked to wanting to demonstrate the effects and influences of age, obesity, latitude, change of season, use of sunscreens, skin pigmentation and clothes on the vital process which sees the skin involved in the formation of vitamin D.

In general, as doctors and institutions state, it can be said that, if a person already follows a diet rich in vitamin D and exposes his skin to about a quarter of an hour of sunlight a day, about 400 IU daily would sufficient.

In other cases, that is with pathologies, deficiencies, inability to be exposed to the sun, the dose of vitamin D to be taken could also be greater, including between 1, 000 and 2, 000 IU.

Dr. Holick underlines how much the intake of this vitamin is essential, especially for women, who with pregnancy get to need at least 2, 000 IU per day to strengthen their bones and keep away serious diseases.

In a video (at the bottom of the page), the doctor also explains why it is so important to have solar exposure that does not use filters and screens : in fact, in his opinion, we should learn to benefit from the sun, without abusing it, giving ourselves a yes perfect and protected tan, but also deeply nourish the body.

Sunscreens and vitamin D

It should be considered that a sunscreen 30 to protect blocks the formation of vitamin D by more than 90%. In this regard, he himself created and recently released a sunscreen that would help stimulate the production of vitamin D, which according to laboratory experiments, it would allow us to synthesize 50% more vitamin D than a traditional product.

The presentation of its product, the Solar D cream, is present on its fb page and sold for around 11 dollars, plus or minus 10 euros, on the Amazon website.

Are you curious and want to try it? Before doing so, remember that it is always important to hear the opinion of an expert, know the ingredients well and evaluate according to the type of skin.

Watch the video in which Dr. Holicks explains the importance of vitamin D