ActivJuice® +PLUS combines delicious sour cherry juice (a natural source of polyphenols), with GLUCOSAMINE (1500mg HCl per 25ml), CHONDROITIN (370mg) and OptiMSM® (125mg), plus over 100% RDA VITAMIN C to provide a refreshing way to take your daily dose. Cartilage is a primary constituent of joint tissues. Glucosamine & chondroitin are natural components of proteoglycans (found in joint tissue). OptiMSM® is superior MSM; guaranteed purity & rigorous testing. MSM is a naturally occuring substance abundant in sulphur and methyl groups.