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These treatments are often administered through injections, as this ensures that the peptides are absorbed directly into the bloodstream for maximum efficacy

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The 1% formulation (10mg/mL) represents the optimal balance between efficacy and shelf life for most cosmetic research applications, which is why it appears most frequently in peer-reviewed trials examining GHK-Cu's effects on collagen synthesis, elastin production, and matrix metalloproteinase inhibition

Both remain in phase 3 clinical development programs [16]: Cagrilintide Status: Phase 3 trials ongoing for CagriSema (cagrilintide + semaglutide combination) Expected approval timeline: 2027-2028 for the combination product Monotherapy development pathway unclear Retatrutide Status: Phase 3 trials initiated in 2024-2025 Monotherapy development for obesity and metabolic dysfunction Expected approval timeline: 2028-2029 if trials succeed This regulatory status means any use of these compounds, whether individually or in cagrilintide dosage with retatrutide combinations, occurs in research contexts or through off-label prescribing once (if) individual approvals are obtained