Vitamin B3
Sources: Fruits, fish, liver, sweet potato, wheat, yeast, etc.
Diseases Caused by Lack of Vitamins: Insomnia, nausea, digestive disorders, muscle cramps, etc.
Vitamin B6
Sources: Beans, corn, rice, fish, liver, meat, yeast, etc.
Diseases Caused by Lack of Vitamins: Skin problems, muscle cramps, insomnia, etc.
also on another note, Cramps associated with menstrual cycle and menopause can be treated successfully by large doses of Vitamin E, B6 and B12.