| http://www.w3.org/ns/prov#value | - 25(OH)D consists of (a) 25(OH)D3 (synthesised from vitamin D3 mainly obtained from synthesis in skin in response to UVB exposure, but also from supplements and some food sources such as oily fish) and (b) 25(OH)D2 (synthesised from vitamin D2 which is obtained from plant food sources and supplements).
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