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2 update layout and reference Rita Xu unknown -1247 word(s) 20,494 2020-11-17 05:03:05 2020-11-17 05:29:46 |
1 Vitamin D, unlike the micronutrients, vitamins A, E and K, is largely obtained, not from food, but by the action of solar UV light on its precursor, 7-dehydrocholesterol, in skin. With the decline in UV light intensity in winter, most skin production of David Fraser unknown + 3606 word(s) 27,746 2020-11-11 10:53:37 2020-11-16 19:48:35 |