Bluebonnet's Flush-Free Niacin 500 mg Capsules contain crystalline flush-free niacin from inositol hexanicotinate to help support cardiovascular health. Available in easy-to-swallow vegetable capsules for maximum assimilation and absorption. Free of milk, egg, fish, crustacean shellfish, tree nuts, peanuts, wheat, and soybeans. Also free of corn, yeast, gluten, barley, rice, sodium and sugar.