yellow tops by organon are probably the highest grade..
so are normas.
many UG labs produce decent quality deca.
so do various companies based out of india and thailand.. although the quality of gear from those 2 countires is sometimes.. well.. lets just say INFERIOR.
i just went through 20 ml. of QV and nothing bad as far as sides. but im not exactly sure that my gains from the D were where i wanted them to be. Unsure really i stacked w/ too many others to evaluate the performance of each. But you cant beat the price of QV i do know that