The extraction problem has been solved for a long time to make recombinant insuline. Before that it had to be extracted from an animals pancreas. These days pep

The extraction problem has been solved for a long time to make recombinant insuline. Before that it had to be extracted from an animals pancreas. These days peptides are often improved using non-natural amino acids to make them more stable and thus longer acting. Semaglutide is a good example. These are synthesized using solid-phase synthesis.