GL-90 is a nutritional supplement marketed to diabetics, pre-diabetics, and anyone concerned about maintaining healthy blood sugar levels.<br /> <br /> Featuring a blend of eight natural ingredients, GL-90 can purportedly promote healthy blood sugar levels without side effects. Active ingredients in GL-90 include gymnema sylvestre, bitter melon, ginger root, and fenugreek, among other science-backed plant extracts and herbs.