Kwn wrote about this on the other board and I told him I was going to copy it out:
"Something weird happened today as well. I am taking niacing for the last 3 weeks. It was a slow release niacin, and if I take it with meal - no effect. If it is on empty stomach, I feel skin tingling, and hands show red rash. It is itchy sometimes, but goes away after 30-60 minutes. This effect is well know with niacin. Today I took a different brand, 500 mg, NON-slow release, in the morning, on empty stomach. On the way to work I felt nuclear tingling, my face and hands went purple. I went to bathroom - turns out my whole body was red as if I had a massive sunburn. Then heart went into racing mode. In about 2 hrs it all subsided, but it was rather scary shit."