Jarrow Formulas Inositol Powder uses Japanese pharmaceutical grades inositol for absolute purity and effectiveness. Inositol is slowly and steadily taking on increased nutritional significance as beneficial nutrient to supplement for a very wide range of health issues from mood support to cardiovascular health and more. Whereas harsh, gritty or bitter tasting powders are all but unusable in powder form, nutrients that are fast-dissolving and essentially tasteless, like glutamine, creatine and inositol are both easier to take and more cost-effective when used in powder form. Jarrow is a best-selling Inositol Powder.