Lysine Step Up supports healthy growth and development for children, adolescents and young adult. Contains an essential amino acid Lysine cannot be synthesized by the body. 6+ years kids can intake. · Lysine hydrochloride 312.3mg. · Equiv to lysine 250mg. · Contains essential amino acid. Lysine is an essential amino acid that cannot be synthesized by the body and must be adequately obtained from diet. Lysine inadequacy may result from poor dietary habits or inadequate nutrient intake, which may occur due to fussy eating habits, poor appetite or illness. BioIsland Lysine Step Up for Youth helps support healthy growth and development for children, adolescents and young adults whose dietary intake may be inadequate.