Tyrosine is not an essential amino acid, so our body is capable of producing it – even though in very small quantities – from phenylalanine essential amino acid. It can also be found in its natural form in banana, avocado and in most high-protein foods such as meat, dairy products and eggs. To produce thyroxine, your body needs iodine. The hormones themselves contain 65% iodine. As a direct consequence, in geographical areas where iodine intake is low, thyroid diseases are more common. We can also use tyrosine containing products in cases of hypothyreosis (or underactive thyroid); moreover, if the product also contains iodine, symptoms can be reduced considerably. Like all BioTech USA products, L-Tyrosine consists of safe and carefully selected ingredients.