most helpful answer no. niacin does not cause cancer.
does niacin cause cancer? . i have started taking niacin to increase my hdl. for the last 3 months i have taken 400mg a day and had 1 beer a day. both were things i found on several wed sites to increase hdl. most other things listed i was already doing. my hdl was 37 and after 3 months it was 42. i was planning on stopping the beer a day and continuing the niacin to see which was causing the improved results. then a co-worker said he was told niacin can cause cancer.