I used to get terrible cramp in my feet, especially at night, had to wear bed socks because i had cold feet.
Then i started taking Redmonds seasalt, 1/4 to 1/2 tsp per day, used to take it in tomato juice, and it did something to my circulation. My husband used to complain about my cold feet, and within a week they felt hot to me and husband said they were hot, and no more cramps. I also took magnesium. I was amazed because i'd had cold feet for years, i also have hypothyrodism. It really worked that quick.