A review published in Pharmaceuticals noted that BPC-157 is known to cause pain or localized tissue reaction when injected in aqueous solution or physiological saline
This peptide, which acts as a first responder after injury, reduces swelling and pain
While the research is primarily from skin models (in vitro, animal, and some human topical studies), they point to GHK-Cu as a peptide that supports structural repair, which is more suitable for lifters coming off hard training or minor injuries but not for direct muscle growth [1, 2]
Using sterile water or, worse, tap water will lead to bacterial growth and rapid degradation of your peptides
GHK-Cu is a naturally occurring copper-binding tripeptide that stimulates collagen synthesis, accelerates tissue repair, modulates gene expression across hundreds of pathways, and supports skin regeneration at the cellular level
Another one of our recommendations, INNBEAUTY Project Elastic Skin is our pick for people with dry or acne-prone skin