From the Manufacturer's Label:
Inositol Hexanicotinate is a stable, non-flushing source of Niacin. This superior source of Niacin works to reduce the common “niacin-flush” problems associated with high doses of Niacin supplements.
Manufactured by NOW® Foods.Contains no sugar, salt, yeast, wheat, gluten, corn, soy, milk, egg or preservatives. Vegetarian Formula.