Lysine

Lysine (Lys) is an essential amino acid for horses, meaning it must be provided in the diet since their body cannot create enough of its own. Lysine is also a limiting amino acid. This means if it is not present in adequate amounts it limits the body's ability to make protein. Lysine is required for all ages and uses of horses, but it is especially important in pregnant and lactating mares, young growing horses, and senior horses.