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Original formula Synflex is recommended by veterinarians for use in pets. It's a pharamaceutical quality liquid supplement with a doseage size of 1250 mg. It's affordable and contains the following synergistic ingredients:
Corta-Flex is a very low quality supplement with only about 100 mg of glucosamine per day dose. This product is no recommended.
Arti-Flex is a pharmaceutical grade glucosamine supplement. The amount of glucosamine per daily dose of Arti-Flex is 2100 mg. It comes in a liquid form and is made from glucosamine HCL. It also contains manganese and vitamin C. While Arti-Flex is a very good product, it's also very expensive.
Cosamin-DS is not recommended. While it has an amount per daily dose of 1000 mg, it also has a very high manganese content, which can be harmful. It also comes in pill form, which can make the glucosamine HCL harder to absorb and therefore less effective.