Supplier Page from Thermo Fisher Scientific for Urea hydrogen peroxide, 1 g tablets, stabilized, contains 35 wt% H2O2
2-Mercaptobenzothiazole, 95% from Thermo Fisher Scientific
D-Cystine, 98% from Thermo Fisher Scientific
L-Alanine, 99% from Thermo Fisher Scientific
L-Serine, 99% from Thermo Fisher Scientific