Tyrosine is an important amino acid for maintaining a healthy metabolism. It is involved with neurotransmitters in the brain. It works to encourage alertness, relieve stress and reduce the physical effects of tension. Low levels of Tyrosine have been associated with hypothyroidism. Symptoms of tyrosine deficiency can also include low blood pressure, low body temperature and restless legs. Each capsule contains 500 mg of L-Tyrosine and 15 mg of Vitamin B-6 which is an important vitamin for metabolizing amino acids.