Intake data from a number of European countries indicate that average intakes of vitamin B3 (niacin) for adults (20–40 mg/day) are above those recommended (23).
In the U.S., the average dietary intake of vitamin B3 (niacin) is about 30 mg/day for young adult men and 20 mg/day for young adult women (22).
In a sample of adults over the age of 60, men and women were found to have an average dietary intake of 21 mg/day and 17 mg/day, respectively.
Dietary surveys indicate that 15–25% of older adults do not consume enough vitamin B3 (niacin) in their diets to meet the RDA, and that dietary intake of niacin decreases between the ages of 60 and 90 years.
Authored by Dr Peter Engel in 2010, reviewed by Giorgio La Fata on 06.06.2017