I haven’t written about niacin for over a year, and like a misunderstanding of the Mayan calendar that won’t go away, niacin is in the news again this week. You can catch up on the old news by reading my previous posts (links below) but here’s the story in a nutshell. People with high levels of a cholesterol molecule called LDL tend to have more strokes and heart attacks than people with normal LDL levels. People with low levels of a cholesterol molecule called HDL tend to have more strokes a...