... .2.MSM is used for chronic pain, osteoarthritis, joint inflammation, rheumatoid arthritis, osteoporosis, bursitis, tendonitis, tenosynovitis, musculoskeletal pain, muscle cramps, scleroderma, scar ... , and muscle. Thus, it is important in conditions such as arthritis, muscle pains, bursitis, etc.3.MSM should be considered an ...