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A popular myth has grown around the use of WD-40 as a joint lubricant and pain reliever for arthritis. The liquid is sprayed on the painful joint much as one would fix a squeaky mechanical hinge.
Most studies of using MSM for arthritis have used doses ranging from 500 mg three times a day up to 2000 mg twice daily, taken by mouth. For allergic rhinitis (a runny or stuffy nose due to allergies), one study used an MSM dosage of 2600 mg per day.