The brown top hyges were a knockoff made by dr.lin who was one of the starting scientists who made hyges originally. They were just as good as the regular hyges.
Kefeis are a cheap knockoff Gh too lets not forget. But a good generic in everyone's eyes
dr lin was the chief chemist responsible for the creation of the stable 191 amino acid sequence in Hygetropin, before he left.. so that is a bit different then someone else producing fakes and claiming them to be hyges in my eyes