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  1. Niacinamide 
    https://medlineplus.gov/druginfo/natural/1534.html
    ... than what is needed by the body. Unlike niacin, niacinamide doesn't help treat high cholesterol. People use ... NIACINAMIDE are as follows: A disease cause by niacin deficiency (pellagra). Niacinamide prescription products are US FDA approved for preventing ...
  2. Niacin 
    https://medlineplus.gov/ency/article/002409.htm
    ... beverages or alcohol with niacin. New forms of niacin supplements have less side effects. Supplements in the form of nicotinamide or niacinamide do not appear to cause side effects.