| http://www.w3.org/ns/prov#value | - Pregnant women (or women who may become pregnant) should not take more than 10,000 Units per day.Vitamin B3 (Niacinamide) ??? topical gel, containing 4% Niacinamide, applied twice per day.Vitamin B6 ??? 100 milligrams per day, especially if acne is associated with the menstrual period.Vitamin C ??? 1,000 milligrams, 4 times a day.
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