Chondroitin is naturally present in the gristle in meat. As a supplement it is generally produced from natural sources, such as shark or bovine (usually tracheal) cartilage or Chondroitin 237
can be manufactured in the laboratory using various methods. The purity and content
of products has been questioned in the USA, where it is regarded as a nutritional supplement and its quality is unregulated (Consumer-labs 2).
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