Many: Ryr can cause abdominal pain, allergic reaction, dizziness, liver and muscle inflammation with muscular pain, flatulance (gas), stomach pain, and headache. Aside from flushing, Niacin can cause liver damage, itching, low blood pressure, upset stomach, diarrhea, vomiting, gout, rashes, headache, diabetes, liver inflammation, and blurred vision.
Answered 6/30/2014
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