Pharma Grade DMSO (Dimethyl Sulfoxide) is a very distinctive dipolar highly aprotic organic solvent with a freezing point of 64 Deg F.If your DMSO arrives with crystals or has solidified, it can be turned back into a liquid by allowing it to thaw out above this temp, however it will take some time. DMSO by itself is actually odorless, what makes Dimethyl Sulfoxide smell and taste like onions or garlic is DMS (Dimethyl Sulfide). Industrial grades of DMSO will contain DMS and therefore give off an offensive odor. Pure Pharma Grade Dimethyl Sulfoxide is distilled and purified to remove DMS and any other contaminants leaving it odorless. The Toxicological aspects of DMSO have been studied extensively over a long period of time and it has been concluded to be a very low toxicity hazard in humans and animals via oral and parenteral routes.