What is the recommended daily allowance of niacin?

In cases of where niacin has allegedly helped alleviate fatigue, depression, and anxiety in individuals, the reported dosage is usually 3 grams. In some cases 1.5 grams. If your truly trying to experience noticeable beneficial effects from niacin, I wouldn't go under 1.5 grams. I would recommend flush-free niacin. And remember: In general, daily values of vitamins are based much more on avoiding deficiencies, rather than optimal health.