Copper Peptides (GHK Cu): Benefits and Side Effects Peptides stimulate growth hormone and IGF 1 production, promoting angiogenesis and cellular proliferation. In patients with undetected cancers, these peptides can accelerate tumor growth. Conventional imaging misses early cancers. Circulating tumor Normal Physiology of Growth Hormone in Normal Adults Endotext NCBI Bookshelf Endocrine Feedback Loops My Endo Consult Let's talk about GHKU CU GHK Cu: The Regenerative Glow Peptide GHK Cu (Copper Peptide) is a naturally occurring peptide in your body that plays a powerful role in cellular repair, skin