I realize that more and more people are using niacin for cholesterol but I personally don't believe that this is the best treatment. I too tried it but was disappointed. Rather large doses are recommended for positive effects on cholesterol like 1,000-2000mg/day. But I experienced lots of issues at this dosage, the main one being terrible flushing that made me look like I had sunburn. It also made me itch like I was having an allergic reaction.
I've come to know now that many people on high doses of niacin experience the same issues. I no longer feel that this is a safe option for reducing bad cholesterol. It's better to avoid animal fats and increase healthy fats in the diet like walnuts.