One day, when I was vitamin shopping, a man started a conversation about why he was buying potassium. He said he'd had such severe muscle cramps (due to the drugs he took) that his heart had cramped up and caused a heart attack. His dr. ordered potassium for prevention. The timing was perfect because I'd been having some really intense cramps myself (no drugs here-just gallons of sweat).The potassium didn't work for me but a daily banana or three did. I always share them with my birds and give them tiny bites.