Melts Fast, Flavor Lasts Since 1932 Innovative Quality Dietary Supplement 1 Daily Instant Dissolve Natural Flavor Discussion: KAL L-Glutathione ActivMelt natural orange flavored micro tablets melt quickly in the mouth and are designed for optimal absorption in the body. L-Glutathione is the reduced form of glutathione and is a natural compound made in the body. The "L" designation indicates the natural molecular structure. L-Glutathione is the body's major cellular antioxidant.