ORALX TYROSINE is a blend of herbs and amino acids. Its two main ingredients are Phenylalanine and Tyrosine. ORALX TYROSINE paste works in two ways: Phenylalanine is important because the equine body cannot produce it in sufficient quantities when under stress, as in heavy competition or racing; and Phenylalanine aids the thyroid, assisting the absorption of oxygen and converting fats to energy for a staying finish with minimum levels of stress