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rPeptide: Best for Recombinant Peptides and Proteins rPeptide builds its catalog by recombinant expression, not chemical synthesis

The argument made by some vendors was that because PDA uses an arginine counterion rather than acetate, it constitutes a distinct chemical entity not covered by the BPC-157 Category 2 ruling

And the evidence keeps growing

[1] Plain sterile water has no preservative and should be used right away

Published research has identified kisspeptin signaling as a major upstream regulator in reproductive neuroendocrinology, making it an important area of investigation for understanding endocrine signaling