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Cosequin for cats contains carefully selected forms of glucosamine and chondroitin essential for the maintenance of healthy joint cartilage, without harmful side effects. Glucosamine hydrochloride supplies the cartilage with nutrients while chondroitin sulfate blocks the action of the destructive enzymes. It has been found that the addition of manganese ascorbate further encourages the production of healthy cartilage.
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Source:
http://top-10-list.org/2015/05/16/without-harmful-side-effects-glucosamine-hydrochloride-supplies-the-cartilage-with-nutrients-while-chondroitin-sulfate-blocks-the-action-of-the-destructive-enzymes-it-has-been-found-that-the-additio/