Magnesium is involved in many body functions such as muscular contractions, skeleton development, and enzymatic reactions. Two factors increase the risk of grass tetany: deficient supplies related to poor grass and important magnesium needs (dairy production, heat stress etc.). Trace elements deficiencies are also often linked to appearance of warts as they play a role in immunity (selenium and copper as antioxidants) and in skin quality (copper, iodine).