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Matti Narkia

Vitamin D effective ultraviolet wavelengths due to scattering in shade - ScienceDirect ... - 0 views

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    Vitamin D effective ultraviolet wavelengths due to scattering in shade.
    Turnbull DJ, Parisi AV, Kimlin MG.
    J Steroid Biochem Mol Biol. 2005 Sep;96(5):431-6. Epub 2005 Jul 6.
    PMID: 16005208
Matti Narkia

In vivo threshold for cutaneous synthesis of vitamin D3. - [J Lab Clin Med. 1989] - Pub... - 0 views

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    In vivo threshold for cutaneous synthesis of vitamin D3.
    Matsuoka LY, Wortsman J, Haddad JG, Hollis BW.
    J Lab Clin Med. 1989 Sep;114(3):301-5.
    PMID: 2549141
Matti Narkia

Aging decreases the capacity of human skin to produce vitamin D3. - Journal of Clinical... - 0 views

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    Aging decreases the capacity of human skin to produce vitamin D3.
    MacLaughlin J, Holick MF.
    J Clin Invest. 1985 Oct;76(4):1536-8.
    PMID: 2997282
    doi:10.1172/JCI112134

    An evaluation of surgically obtained skin (age range, 8-92 yr) revealed that there is an age-dependent decrease in the epidermal concentrations of provitamin D3 (7-dehydrocholesterol). To ascertain that aging indeed decreased the capacity of human skin to produce vitamin D3, some of the skin samples were exposed to ultraviolet radiation and the content of previtamin D3 was determined in the epidermis and dermis. The epidermis in the young and older subjects was the major site for the formation of previtamin D3, accounting for greater than 80% of the total previtamin D3 that was produced in the skin. A comparison of the amount of previtamin D3 produced in the skin from the 8- and 18-yr-old subjects with the amount produced in the skin from the 77- and 82-yr-old subjects revealed that aging can decrease by greater than twofold the capacity of the skin to produce previtamin D3. Recognition of this difference may be extremely important for the elderly, who infrequently expose a small area of skin to sunlight and who depend on this exposure for their vitamin D nutritional needs.
Matti Narkia

Sunlight Regulates the Cutaneous Production of Vitamin D3 by Causing Its Photodegradati... - 0 views

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    Sunlight regulates the cutaneous production of vitamin D3 by causing its photodegradation.
    Webb AR, DeCosta BR, Holick MF.
    J Clin Endocrinol Metab. 1989 May;68(5):882-7.
    PMID: 2541158
    doi:10.1210/jcem-68-5-882

    Vitamin D3 proved to be exquisitely sensitive to sunlight, and once formed in the skin, exposure to sunlight resulted in its rapid photodegradation to a variety of photoproducts, including 5,6-transvitamin D3, suprasterol I, and suprasterol II.suprasterol I, and suprasterol II.
Matti Narkia

Aging decreases the capacity of human skin to produce vitamin D3. - J Clin Invest. 198... - 0 views

  •  
    Aging decreases the capacity of human skin to produce vitamin D3.
    MacLaughlin J, Holick MF.
    J Clin Invest. 1985 Oct;76(4):1536-8.
    PMID: 2997282
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