My 96 year-old Grama uses it on her arm because of damage created at a hospital when they missed her vein and fed fluid into her arm instead of her blood stream. She was in chronic pain, and woke up every night because of it. The solution was to have her on continuous pain meds morning and night. She opted out and instead chooses to use Deep Blue every morning and night, and can sleep the whole night through now because of it. doTERRA, Grama Rose says THANK YOU - Move over Ben-Gay and Icy - Hot, Deep Blue is FABULOUS!