In 1984 Quantum became the very first company to market zinc lozenges following the publication of a study in the Journal of Antimicrobial Medicine. Since then, other studies have increased the popularity of this immune-boosting mineral. Thera Zinc lozenges contain the same form of zinc used in clinical studies, and the same dosage. Fully ionizable zinc gluconate assures the potency of Thera Zinc lozenges. In addition, Quantum's newest formula has a smooth taste and the immune boosting nutrients Vitamin A, Slippery Elm, Larch, Marshmallow Root and Mullein. Author Michael Castleman touted Quantum's lozenges in his book "Cold Cures: The Complete Guide to Prevention and Treatment of the Common Cold and Flu."