Corosolic acid is a nutrient that holds a lot of potential for diabetics, dieters, bodybuilders, hypoglycemics or anyone else concerned with optimal glucose metabolism. Corosolic acid is an herbal extract, derived from a species of myrtle. Corosolic acid supplements, like premium GlucoTrim contained in NOW Foods GlucoFit, have been overshadowed by other blood-sugar optimizers like chromium, cinnamon or alpha lipoic acid, but since it works differently than these other nutrients, GlucoFit can be used along with them for more blood sugar and glucose support.