Sensible Sun Exposure to increase Vitamin D levels: Vitamin D3 is produced photochemically in the skin from 7-dehydrocholesterol after exposure to UVB light. Sunscreen absorbs ultraviolet light and prevents it from reaching the skin. Sunscreen with a sun protection factor (SPF) of 8 based on the UVB spectrum has been reported to decrease vitamin D synthetic capacity by 95%, whereas sunscreen with an SPF of 15 can reduce synthetic capacity by 98%. 7-dehydrocholesterol is the pre-hormone in the conversion to Vitamin D3 which requires an adequate cholesterol supply.
Posted on: Fri, 15 Aug 2014 19:43:58 +0000
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