The GHRP and CJC are all good to go. These are short peptides to begin with and are ideal for manufacturing with peptide synthesizers, which are much more common these days and have driven down the prices given all the competition. As a general rule, anything under 30 amino acids will probably work as a peptide made chemically. Peptides such as MT2, PT-141, thymosin b4 are all active when chemically synthesized. However, Insulin, HGH and IGF-1 all need to be generated in bacteria (recombinantly) and purified carefully so that activity is retained. All three of these proteins (they are not peptides) are folded and disulfide bond linked in a special way that can only be accomplished in a biologic system, like bacteria. Even the bacteria have to be specially modified to generate HGH and IGF-1 correctly with the proper folding. This typically is only done correctly at a large biopharmaceutical company.
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