Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 58-22-0, Whether you call it Testosterone, 4-Androsten-17&#223, -ol-3-one , 17&#223 or -Hydroxy-4-androsten-3-one you can be assured the Testosterone products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.