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Most of the nutrients for joints work slightly differently; such as, there are some products meant specifically for pain control and other joint support supplements that act as lubricants. Some others repair and rebuild the damage. Whatever it is, all of them benefit the consumer. As mentioned above, Chondr Pharma Flex RX oitin, Glucosamine and MSM are the ingredients that give the benefits. Glucosamine being an amino-acid helps fight joint deterioration and provides lubrication. Collagen supplements help in replacing and replenishing natural collagen that decrease as you grow older. Most of the nutrient supplements for joints help in maintaining flexibility and protects joints from oxidants which can cause cartilage damage.