I have been applying magnesium oil to my chest once a day for heart palpitations.I haven't had any palpitation since the day I started. I also noticed one day that my palms and fingers were turning pink after applying the oil. I usually wash the oil off my hands right after application. But since I suffer from cold hands and feet, I decided to leave the magnesium on my hands for a good 10 minutes. The improvement in circulation to that area has been astounding! It only lasts about 12 hours before I need to do it again, but I am very pleased with the results so far.