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Jafek BW, Linschoten MR, Murrow BW
Injectable GLP-1 medications are administered via a small subcutaneous injection, typically once weekly (semaglutide, tirzepatide) or once daily (liraglutide)
Metformin may cause nausea, diarrhea, or reduced appetite, especially when treatment starts or changes
3 (6.1%) required a phone call
daily sunscreen required, usually applied at night Collagen Evidence GHK-Cu (copper peptide) Increased collagen in more subjects than vitamin C or retinoic acid in review data Retinol (retinoid) Well-documented collagen improvement in photoaged skin over months Route / Format GHK-Cu (copper peptide) Topical serum (OTC) or, at PeRx, prescription subcutaneous injection Retinol (retinoid) Topical cream or serum only Best For GHK-Cu (copper peptide) Sensitive skin, collagen and skin-quality support, gentle anti-aging Retinol (retinoid) People who tolerate a turnover agent and want a heavily studied option Read the table as two tools, not a winner and a loser
Smullin DH, Skilling SR, Larson AA
