this was taken from, www.thefreedictionary.com.

Herbal remedies may include Evening Primrose (Oenethera biennis), Black Current (Ribes nigrum), and/or Flaxseed (Linum usitatissimum) Oils - the omega-3 and omega-6 fatty acids in these oils help maintain the myelin sheath around nerves.  Typical dosage is 500-1500 milligrams per day of evening Primrose or black current seed oils, or 1 tablespoon per day of Flaxseed oil. Use pure oils that require refrigeration.

Also Purslane (Portulaca oleracea) - This common, flat, spreading garden "weed" has long been added to salads by those who enjoy slightly bitter wild greens.  It turns out that purslane is high in magnesium, one of the many minerals that people with chronic Muscle spasms tend to be deficient in.  James A. Duke, Ph.D., author ot 'The Green Pharmacy", recommends eating purslane, steamed or raw, along with spinach and other high-magnesium foods.  Although purslane is the focus of much new research, it's not yet available in supplement form, so get it fresh from your favorite gardening friend.