Phenylalanine is an essential amino acid since other amino acids are formed from it in the body.
Along with tyrosine, it provides raw material from which the body makes the hormones adrenaline and thyroxine. The body can also convert phenylalanine to tyrosine but not vice versa.
Functions in the Body
Phenylalanine is effective for weight control because of its effect on thyroid secretion. It also plays an important role in the control of appetite. If taken before meals, it suppresses the appetite substantially. This amino acid is also essential for the efficient functioning of the kidneys and the bladder.