l-phenylalanine (63-91-2), l-leucine (61-90-5), l-valine (72-18-4), vitamin a (68-26-8), vitamin d (67-97-0), l-cystine (56-89-3), l-taurine available from j r carlson laboratories inc based in arlington heights, il. click the links below to visit our website or contact us via our profile page.