Inositol Hexanicotinate. Dietary Supplement. TWINLAB NO-FLUSH NIACIN (Inositol Hexanicotinate) is an ester compound formed from a six-to-one (6:1) molar ratio of niacin and inositol. Its unique properties allow for true niacin activity without niacin's characteristic flush. Each specially formulated, highly concentrated capsule contains only the finest quality no-flush niacin (Inositol Hexanicotinate). Each capsule is free of coatings and colors which may cause adverse reactions in people with allergies or on special diets. Free of corn, soy, yeast, wheat, milk, and egg products. No added sugar, fat, or preservatives.