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However, according to research published in the journal Acta Biomaterialia , about 95% of GHK-Cu injected into the dermis is metabolized and excreted from the body

Experts suggest a daily nasal spray dose ranging from 750mcg to 1mg

Aqueous, low-viscosity serum formats generally deliver better penetration than cream or lotion formats water-based vehicles allow closer contact with the stratum corneum surface

Contraindications and precautions Consider avoiding DSIP or consulting a physician if: Pregnant or breastfeeding (insufficient safety data) Taking naloxone or other opioid antagonists (may block effects) Using medications metabolized by peptidases (potential interactions) History of immune disorders (theoretical immunogenicity concern) Already using multiple sleep medications Drug interactions Because DSIP degrades via amino-peptidases in blood, medications affecting these enzymes (like the ACE inhibitor captopril) could theoretically alter DSIP metabolism