All of Dr. Milt’s Liniment products contain 99.9% pure USP (Pharmaceutical Grade) Magnesium Sulfate Crystals that have been converted to liquid and gel through our unique formulations. Other natural and active ingredients include all or most of the following: Witch Hazel, Arnica, Essential Oils, Petrolatum, Peppermint & Wintergreen Oils and Xanthan Gum.