Country Life L Tyrosine with B 6 is a non-essential amino acid used by the thyroid gland. Tyrosine is involved in energy production. B-6 aids in the utilization of Tyrosine. Country Life L Tyrosine is kosher and vgetarian. L-tyrosine is a nonessential amino acid (protein building block) that the body synthesizes from phenylalanine, Another amino acid. Tyrosine is important to the structure of almost all proteins in the body.