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The first region (residues 121) is a proline-rich domain, the second region (residues 2237) is a cystine-rich domain, the third region (residues 3848) is the hydrophobic-core domain, the fourth region (residues 4959) is rich in basic residues (basic-domain), and the fifth region (6072) is the glutamate-rich domain (Kuppuswamy et al., 1989)

As we covered earlier in this guide, research suggests that GHK-Cu seems to suffer from some stability issues,9 but ectoine has shown promise as an ingredient that may improve the stability of some peptides.8 Additionally, ectoine is whats known as an extremolyte this is a molecule that can protect cells from extreme stress

The peptide also potentially maintains spindle integrity and correct distribution of cortical granules (CG)

Oral bioavailability for systemic purposes is estimated at 1030% of injectable delivery

For individuals with Wilson's disease (a genetic disorder causing copper accumulation) or other copper metabolism disorders, theoretical caution is warranted, though even in these populations topical GHK-Cu is unlikely to pose significant risk given the minimal systemic absorption