Tolerable upper intake levels for vitamins: Dietary reference intakes (DRIs)

Life stage group	Vitamin A (mcg/day)*^¶	Vitamin C (mg/day)	Vitamin D (mcg/day)^Δ	Vitamin E (mg/day)^◊^§	Niacin (mg/day)^§	Vitamin B₆ (mg/day)	Folate (mcg/day)^§
Males
19 to 30 years	3000	2000	100	1000	35	100	1000
31 to 50 years	3000	2000	100	1000	35	100	1000
51 to 70 years	3000	2000	100	1000	35	100	1000
>70 years	3000	2000	100	1000	35	100	1000
Females
19 to 30 years	3000	2000	100	1000	35	100	1000
31 to 50 years	3000	2000	100	1000	35	100	1000
51 to 70 years	3000	2000	100	1000	35	100	1000
>70 years	3000	2000	100	1000	35	100	1000

A tolerable upper intake level (UL) is the highest level of daily nutrient intake that is likely to pose no risk of adverse health effects to almost all individuals in the general population. Unless otherwise specified, the UL represents total intake from food, water, and supplements.

* As preformed vitamin A only.
¶ 1 mcg retinol = 3.33 IU retinol.
Δ 1 mcg = 40 IU.
◊ As alpha-tocopherol; applies to any form of supplemental alpha-tocopherol.
§ The tolerable upper intake levels for vitamin E, niacin, and folate apply to synthetic forms obtained from supplements, fortified foods, or a combination of the two.

Data from: Otten JJ, Hellwig JP, Meyers LD (Eds). Dietary Reference Intakes: The Essential Guide to Nutrient Requirements. The National Academies Press, Washington, 2006.

Graphic 86660 Version 3.0

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Tolerable upper intake levels for vitamins: Dietary reference intakes (DRIs)