I've suffered with leg cramps since my teens, mostly waking at night with severe cramps in my calves or thighs. About 5 years ago I saw an article in a magazine about a university that had done research on athletes and cramps and one of the conclusions was that the use of vinegar helped relieve cramping. After further reading, I found that the use of 1/2 to 1 tablespoon of vinegar would help relieve or prevent cramps, so with nothing to lose, I gave it a try. After some experimentation, I found that by taking 1 tablespoon of 5% Heinz ACV mixed with V-8 or tomato juice before bedtime, I have eliminated the night time cramps that plagued me for years. No more doing the "war dance" at 0 dark thirty in the morning!
I don't know if it helps with anything else but it sure has helped me.