Made with Menthol Crystals (Mentha arvensis) 100% Pure & Natural and are extracted from 100% mint leaves using steam distillation followed by a gentle freezing process.
Mixed at 40% this menthol is extremely strong, mixed with Pharmaceutical Propylene Glycol 
Please use sparingly only a few drops at a time or 0.2 to 1% Its normal to crystalize just give a warm bath