Children aged 0-6 months – 40 mg per day.
Children aged 7-12 months – 50 mg per day.
Children aged 1-3 years – 15 mg per day.
Children aged 4-8 years – 25 mg per day.
Children aged 9-13 years – 45 mg per day.
Adults aged 14–18 years – 65-75 mg per day.
Adults 19+ – 75-90mg per day.
During pregnancy, it is required 80-85 mg per day.
Smokers require 35 mg per day.