Years ago (1990-1994), I tried it from a company called, Atletika. I think it worked pretty well as an adaptogen, helping mefrom being underslept, overtrained, etc.
They were out of Pleasant Hill, CA and marketed "soviet" supplements. Rangicrin was their product that had the most notable effect on libido, aggressiveness. Mumie is supposed to work like ginseing and other adaptogens. My guess is it all depends on the bioavailability and processing of the supplement. So, one brand might work well while another might suck - similar to what people experience with , tongkat ali, forsolkin, cissus quadrangulus, etc.
I havent tried any of the newer products claiming to have mumie in it. Havent seen it sold isolated by itself either - which is what I'd recommend checking out.