We are in the summer of natural cosmetics and forums are full of discussions on physical and chemical sunscreens, nanoparticles, tan, vitamin D, children, etc..
There are many opinions about it, often contradictory, partly because the technology is "young" and studies on the effects of radiation on the filters and consequently on the skin are few and in turn do not agree.
point out some interesting articles that explain the formulation of sunscreen products, how they work, and raise doubts about the effects of substances used.
I go to sun cream that I wear?
solar filters with inorganic micronized form
The importance of vitamin D
nanoparticles in cosmetics. What are the risks?
THE WAY BIOALLEGRA tan
Two considerations appear to apparently contradictory
- sun exposure is necessary for the synthesis of vitamin D
- that of a tan is fashionable in recent 50-60 years, because until the early decades of the 900 was unseemly for noblewomen show a tan, which was set to manual labor. In what fashion, we can look with a critical eye and conscious.
Compared with the first requirement, it is the opinion of many doctors for proper bone development takes 10 minutes per day of exposure to whether or not direct light.
the need for aesthetics, however, we think you should expose to the sun a few hours a day, morning and afternoon before 11 after 17. At these times the sun is low on the horizon and the rays from the atmosphere as filtered, so there should not damage the skin, apart from the delicate types. Therefore, in these hours the station is not necessary and just keep the skin hydrated.
The tan will not be fast or "wild", but will be more natural and will not grow old the skin.
In the other hours you can stay in the woods or under a veranda, enjoying the view, however, widespread and if you feel the need to take a refreshing swim, you can do with a shirt or wearing robes.
Who has the pace of life is incompatible with this method and maybe have a few days left and still want the tan, we recommend you choose a solar filter with micronized physical but not "nano". To spread a generous amount and repeat the application several times during the exposure. In fact, the protection index is calibrated to the most abundant quantities than we usually use.
Finally, remember that:
# ultraviolet rays are able to cross clouds;
# also under the umbrella you receive more than 50% of all ultraviolet rays;
# 95% of ultraviolet rays penetrate through the water;
# 50% of UV-B hits the Earth between 11.00 and 16.00, with this time slot at greater risk of photodamage;
# solar radiation reaches the retina, it will be good to wear glasses with tinted lenses;
# children, especially before three years, should not be exposed to the sun without clothing, dark glasses and hat.
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