The muira puama is ordered from https://www.muirapuama.nl . It’s a dutch supplier. The ginseng and gingko are the housebrand of a franchise called etos (here in the Netherlands) which has a lot of shops, so this info doesn’t help out much. Just try a brand from your country which you trust and see what happens. Make sure you take the "panax" ginseng, this is the one man mostly use.
About the erections I have to add some things that also help into your diet. Nuts and seeds, broccoli which raises natural testosteron and pure chocolate. Off all other measure’s these things don’t help on your erections as much as the supps, but it’s healthy in general, and more relevant to this thread, it specifically has some benefits to your erection level as well. A lot of little things together can also make something big:D
Ps: Somewhere in this thread I wrote that I also haven’t got an orgasm for a while. Yes that works for the erection also, but without the supps, pumping etc etc I know it wouldn’t be as strong as now. The day before yesterday I came twice and one time today and my erection is still good. Even now I am tired.
I, can, I can, I can not, can not compute..