The simple answer is that niacin in this supplement isn’t necessary. Here’s why:
Children 1–10 yrs. need about 6–12 mg/day, and this is easily accomplished with a normal diet (and can also convert from tryptophan). Secondly, it only takes 10–20 mg/day of supplemental niacin to cause skin flushing, GI upset, and possible mild liver damage.
The Food and Nutrition Board sets the upper limit at about 10–15 mg/day for children 1–8 years old. So it’s likely that if niacin were in this supplement, its RDA would be reached and easily exceeded (since Nordic Berries taste so good)!