A proprietary, patented extract highly concentrated in antioxidant activity and anthocyanins for immune system support. Hypoallergenic. Gluten and casein free. Ultra Tested. Kirkman's Super Cranberry Extract is made by a patented process that produces more concentrated antioxidant activity and anthocyanins than other cranberry extracts on the market. Manufactured by Shanstar Biotech, this extract offers much more powerful immune system enhancing benefits than cranberry juice. A 1998 report in the New England Journal of Medicine1 reports that cranberries' positive effect is due in large part to a group of polyphenols called the proanthocyanidins. This version comes in capsule form. 1 Amy Howell et al, New England Journal of Medicine, Vol 339, No 15, Octoer 8. 1998, pp 1085-1086.