Magnesium
Magnesium is a mineral found in a wide variety of foods. The richest sources are green leafy vegetables (such as spinach) and nuts. Good sources include bread, fish, meat and dairy foods

Magnesium has a number of important functions. For example it:
1) helps turn the food we eat into energy
2) helps make sure the parathyroid glands work normally. The parathyroid glands produce hormones important for bone health