Phycox: Glucosamine, chondroitin, and MSM are all supplements commonly used as joint supplements, and they can help with arthritic discomfort. They help to lubricate the joints while reducing inflammation in the same. I commonly get asked whether human versions can be used on dogs, and the answer totally depends on the size of the dog, but I also find that some dogs are more tolerant as well as more responsive to some versions instead of others. This one is the one I’ve seen the best results from by far, as well as the fewest side effects. Keep in mind that as with most supplements, it takes time for the effects to build up in the body, so you need to do a trial of at least 4-6 weeks (most also prescribe a higher dosage for that initial period to help it build up in the body before going to a maintenance dose).