Is the GNC 500 Niacin a 500mg pill? I took 1,000mg niacin for a couple months to help improve my cholesterol levels. It worked wonders, but it made my skin start to thicken and dry out. I lost 35 pounds, instead and did even better. The immediate side effect I got from the niacin was “flushing”. As a dietary supplement, take one or two tablets daily. Niacin may cause a temporary flushing reaction. Consult your physician prior to using this product if you are pregnant, nursing, taking medication or have a medical condition.

Prescription-strength niacin, also known as vitamin B-3, may help improve cholesterol by boosting HDL and lowering LDL and triglyceride levels. When used in combination with statins, niacin could ...