high cholesterol
"I've been taking 500 mg niacin tablets twice daily (morning and night) for 5 years to treat congenitally low levels of HDL.  Over that time, my HDL levels have increased from 25 to 60, and triglycerides have dropped from 150  to 60. The niacin treatment has been so successful that I have managed to drop simvastatin (Zocor) from my regimen. I still get mild flushing symptoms occasionally, but it is a small price to pay for the great results."