What vitamin B3 can teach us about heart health—and being willing to change our minds I have always believed that taking care of ourselves means being willing to learn. Sometimes that means adding something helpful. Sometimes it means reconsidering something we have been doing for years. Niacin is a lovely example of why that willingness matters. For decades, niacin was used to improve cholesterol levels. It could raise HDL, often called “good” cholesterol, lower triglyceride