Supplier Page from Thermo Fisher Scientific for Copper(II) gluconate
D-Cystine, 98% from Thermo Fisher Scientific
L(+)-Histidine methyl ester dihydrochloride, 97% from Thermo Fisher Scientific
Riboflavin, 98% from Thermo Fisher Scientific
Semicarbazide hydrochloride, 99+% from Thermo Fisher Scientific