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Regarding the issue of
niacin lowering the cholesterol levels,
Niacin or nicotinic acid lowers low density lipoprotein cholesterol, total cholesterol, and triglyceride levels while raising the high density lipoprotein cholesterol levels(good cholesterol).
But this medication is not recommended to be taken by your own because you may miss some important side effects. Side effects include flushing, stomach upset, vomitings,headache, dizziness,liver damage in some cases.