Theraworx Pain Relief – Comfort Care - EachAbout Theraworx Relief Magnesium Sulfate 6X HPUS Topical Pain Relief (1 Unit) 0. 5 of 1% strength magnesium sulfate Prevents and relieves muscle cramps and spasms Fast acting, non greasy, quick drying During cramp event, releases muscle tightness Pump bottle contains 7. 1 ounces of Theraworx Relief foam; there are six pump bottles in a case Description: Topical Pain Relief Theraworx Relief 0. 5% Strength Magnesium Sulfate 6X HPUS Foam 7. 1 oz.