| http://www.w3.org/ns/prov#value | - A vitamin is a substance that is crucial to normal everyday life function, but can???t be synthesized in sufficient quantities by an organism, and thus must be obtained from the diet.1 Your skin has the ability to manufacture as much as 10,000 IU of vitamin D after 20???30 minutes of summer sun exposure.2 But there are many limiting factors to internal vitamin D synthesis that include age, skin co
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