Embodiments of the invention relate generally to the use of formulations comprising DMSO and MSM to treat arthritis (such as osteoarthritis), pain, inflammation, and/or degeneration. DMSO and MSM formulations are administered orally and/or topically in several embodiments and provide effective treatment of both chronic and acute symptoms of arthritis (e.g., osteoarthritis), pain, inflammation, and/or degeneration. Solid forms of DMSO are provided in several embodiments.
