Glucosamine is a natural substance found in the joints playing a role in the smooth working of cartilage tendons and ligamentseach zipvit tablet contains a huge 1000mg of glucosamine sulphate to supplement the natural occurring glucosamine found in your cartilage the quality of this product over our competitors product is reflected in our huge sales figures this is now our number one selling line we believe it is one of the most effective supplements available today 1000mg 360 size