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DRI Dietary Reference Intakes: For Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline
Niacin EAR and RDA Summary, Ages 19 Years and Older
On the basis of the data in Table 6-1 and with a minor (approximately 10 percent) decrease for energy in women, the EAR is set at 12 mg/day of NEs for men and 11 mg/day of NEs for women.
EAR for Men
19–30 years
12 mg/day of niacin equivalents
31–50 years
12 mg/day of niacin equivalents
51–70 years
12 mg/day of niacin equivalents
> 70 years
12 mg/day of niacin equivalents
EAR for Women
19–30 years
11 mg/day of niacin equivalents
31–50 years
11 mg/day of niacin equivalents
51–70 years
11 mg/day of niacin equivalents
> 70 years
11 mg/day of niacin equivalents
The data in Table 6-1 also suggest a CV of the niacin requirement that is greater than 10 percent. The wide variation in the efficiency of converting tryptophan to niacin may contribute to the large apparent variation. Thus, a CV of 15 percent is used; the RDA is defined as equal to the EAR plus twice the CV to cover the needs of 97 to 98 percent of the individuals in the group (therefore, for niacin the RDA is 130 percent of the EAR).
RDA for Men
19–30 years
16 mg/day of niacin equivalents
31–50 years
16 mg/day of niacin equivalents
51–70 years
16 mg/day of niacin equivalents
> 70 years
16 mg/day of niacin equivalents
RDA for Women
19–30 years
14 mg/day of niacin equivalents
31–50 years
14 mg/day of niacin equivalents
51–70 years
14 mg/day of niacin equivalents
> 70 years
14 mg/day of niacin equivalents
Pregnancy
Method Used to Estimate the Average Requirement
There is no direct evidence that would suggest a change in the niacin requirement during pregnancy. To derive the EAR for pregnant women, it is estimated that the need for niacin increases by 3 mg/day of NEs to cover increased energy utilization and growth in
