Ihave been taking 2000 mg of vitamen b3 niacin for several years.
It lowers cholesterol and controls type 2 diabetes.
It also seems to increase my resistance to colds.
I've been prescribed 500mg a day.
I get the niacin flush and become itchy and turn beet red. If you take sustained-released niacin, you may want to get your liver enzymes checked
I assume you're aware of the research that you should be taking it in one dose once a day? Sustained niacin (the flushing kind) that lasts day in and day out can cause liver damage in about 10-15 percent of people.
OTOH, there are well-designed studies that show folks who take statins AND niacin at high doses have a 90% reduction in heart attacks.
So it's worth it. But make sure it's a single dose per day.