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Vitamin A Requirements for Adults. Adult men aged 19 and older should consume 900 micrograms of vitamin A per day. The daily requirement of the vitamin for adult women aged 19 and older is 700 micrograms.
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.