I tried in many places including Puerto Vallarta. Had my daughter bring some down. But if you are using it for edema then try walking in ocean water or buy a small bag of course at the stores in LaManzanilla. I used that and added some peppermint or lavender oils. Jennifer at Zangara has the oils. Soaked my feet in cold water with the salt and oil. No problem since I got home. I also got some diuretics, but you need to chech with the doctor or pharmacist.