MSUD Gel 30 - 24g Sachets, Unflavored. MSUD gel is an unflavored, powdered leucine, isoleucine and valine free protein substitute containing essential and non essential amino acids, carbohydrate, vitamins, minerals and trace elements. MSUD gel is for use in the dietary management of Maple Syrup Urine Disease (MSUD) from 6 months to 10 years of age.