30ml
The Extra Strength Formula is an extension of the original formula using more potent amounts of ingredients as well as the addition of methyl salicylate, which is well know for its anti-inflammatory and pain relieving properties. A word of caution to anyone taking blood thinners, such as warfarin, as methyl salicylate may increase the effects. If you are serious about pain relief then PRN Extra Strength was created for you.