You're ignorant if you think manufacture of Forteo is challenging; better you stick to delivering lunch to MD's offices, because your biotechnology background is pretty weak.
Forteo is a 34-amino acid peptide derived from the N-terminal sequence of parathyroid hormone (PTH); it can be readily made in E. coli expression systems. No post-translational modifications to deal with, just straight peptide sequence ... easy stuff.
Ok, so it would be an exaggeration to say a monkey could make this stuff, but its not far from the truth.