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  2. Vitamin D - Wikipedia

    en.wikipedia.org/wiki/Vitamin_D

    Unlike the other twelve vitamins, vitamin D is only conditionally essential - in a preindustrial society people had adequate exposure to sunlight and the vitamin was a hormone, as the primary natural source of vitamin D was the synthesis of cholecalciferol in the lower layers of the skin’s epidermis, triggered by a photochemical reaction with ...

  3. Human skin color - Wikipedia

    en.wikipedia.org/wiki/Human_skin_color

    This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...

  4. Vitamin D deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_D_deficiency

    Mapping of several bone diseases onto levels of vitamin D (calcidiol) in the blood [6] Normal bone vs. osteoporosis. Vitamin D deficiency is typically diagnosed by measuring the concentration of the 25-hydroxyvitamin D in the blood, which is the most accurate measure of stores of vitamin D in the body.

  5. Sun tanning - Wikipedia

    en.wikipedia.org/wiki/Sun_tanning

    Skin darkening from UVA exposure does not lead to significantly increased production of melanin or protection against sunburn. [9] In the second process, triggered primarily by UVB, there is an increase in production of melanin (melanogenesis), [ 10 ] which is the body's reaction to direct DNA photodamage (formation of pyrimidine dimers ) from ...

  6. Cholecalciferol - Wikipedia

    en.wikipedia.org/wiki/Cholecalciferol

    Cholecalciferol is a form of vitamin D which is naturally synthesized in skin and functions as a pro-hormone, being converted to calcitriol. This is important for maintaining calcium levels and promoting bone health and development. [4] As a medication, cholecalciferol may be taken as a dietary supplement to prevent or to treat vitamin D ...

  7. How to Get Rid of Wrinkles (and What Really Causes Them) - AOL

    www.aol.com/rid-wrinkles-really-causes-them...

    Wrinkles are creases or lines that form in the skin. They’re a natural part of the aging process, though other factors can speed up or slow down wrinkle development. ... Darker skin tones ...

  8. Our 51-year-old beauty expert tests hundreds of anti-aging ...

    www.aol.com/lifestyle/our-51-year-old-beauty...

    We know retinol works reliably to reduce wrinkles but this Swedish brand's Dark Spot Fix does double duty: It's a skin-lightening treatment containing retinol 8, a stabilized vitamin A complex ...

  9. Vitamin D and neurology - Wikipedia

    en.wikipedia.org/wiki/Vitamin_D_and_neurology

    Vitamin D (the inactive version) is mainly from two forms: vitamin D 3 and vitamin D 2. Vitamin D 3, or cholecalciferol, is formed in the skin after exposure to sunlight or ultra violet radiation or from D 3 supplements or fortified food sources. Vitamin D 2, or ergocalciferol, is obtained from D 2 supplements or fortified food sources. [3]