At high doses, niacin, or vitamin B3, can lower LDL (bad) cholesterol by 5 percent, cut triglycerides by 20 percent, and boost HDL
(good) cholesterol by 15 percent.
However, side effects include a dangerous rise in glucose levels in diabetics. Best dosage for men: 20 mg for general health, 100 mg for high cholesterol (but consult your doctor first).
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Interactions & Side Effects