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I'd guess one of the base components for it is grown and not readily available. If you can find a place the unusual microbes or whatever it needs grow then it's possible but without them it's not. Other variations might not be as pure or as strong. I remember seeing a thing saying that 90% of the worlds penicillin is cultivated from the original mould.
Clockwise
@ 
There's some reason that makes that quite difficult which I'm not going to claim to really remember or understand. But I read it in some newspaper somewhere.