My geriatrician suggested quinine…. And I remember my dad, a civil engineer , taking quinine tablets( no longer available for leg cramps. She said Tonic water is the source she suggests, and to watch the sodium. I keep a bottle wherever I sit….and sip all day long. Can’t remember the last leg cramps I’ve had. Grocery stores, Walmart etc carry, about $1 / bottle. I avoid the sugar substitute ones…. hjtk