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Accelerates skin repair GHK-Cu is not just about producing collagen and elastin

This includes: Exfoliating Acids (AHAs/BHAs): Using glycolic, lactic, or salicylic acid alongside tretinoin can lead to severe over-exfoliation and a compromised skin barrier

Where a supplier met more of these marks, it ranked higher in our list

Active cancer or history of malignancy Pregnancy or breastfeeding Known peptide allergies Athletes subject to anti-doping testing (WADA prohibited) Raynauds disease or phenomenon Cold urticaria (hives from cold) Uncontrolled hypertension Peripheral vascular disease Open wounds (for local application) Pregnancy Cardiovascular conditions Diabetes (especially with neuropathy) Current infections Immunosuppression Blood clotting disorders Quality control issues represent perhaps the greatest practical risk with BPC-157