Niacin 500mg 100 capsules, TwinlabNiacin (B-3) is used to lower blood cholesterol, triglycerides, poor circulation, stress, leg cramps, headaches and poor immunity.Instructions: As a dietary supplement, take one capsule daily or as directed. For best results, take after meals.Additional Info: Crystalline Pure, Yeast Free.Ingredients: Niacin (vitamin B-3)?500mg