The company’s stance is fully against using it on arthritic joints.

WD-40 Company does not recommend the use of WD-40 Multi-Use Product for medical purposes, and knows no reason why WD-40 Multi-Use Product would be effective for arthritis pain relief. WD-40 Multi-Use Product contains petroleum distillates and should be handled with the same precautions for any product containing this type of material.

People who swear by getting pain relief from spraying and/or rubbing on WD-40 are actually getting that reliefe from the cooling and/or rubbing, and it’s nothing to do with the chemicals in the spray.