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Vitamin D should not be taken before bed. Vitamin D is a hormone that your body makes while being exposed to sunlight. This process leads to melatonin shutdown in the pineal gland, because sunlight only occurs DURING THE DAY. The best way to take Vitamin D is a liquid micellized D3 in the morning with dietary fat.
Vitamin D Intake. The recommended amounts of vitamin D for adults are as follows: 1  For people over 50 (and postmenopausal women): 400-800 i.u. of vitamin D per day. 2  For people over 65 or 70, at least 600 i.u. is usually recommended. 3  For people 25-50 years old (and premenopausal women): 400 i.u. of vitamin D per day.he recommended amounts of vitamin D for adults are as follows: 1  For people over 50 (and postmenopausal women): 400-800 i.u. of vitamin D per day. 2  For people over 65 or 70, at least 600 i.u. is usually recommended. 3  For people 25-50 years old (and premenopausal women): 400 i.u. of vitamin D per day.