Twinlab No Flush Niacin Description: Inositol Hexanicotinate Gluten Free 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. Free Of Coatings, colors, added fat and preservatives. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.