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But those in younger age brackets aren't necessarily in the clear

Exploring the beneficial effects of GHK-Cu on an experimental model of colitis and the underlying mechanisms2025Anti-Inflammatory GHK-Cu demonstrated significant anti-inflammatory and protective effects in an experimental colitis model, extending its known tissue-repair properties to gastrointestinal inflammation and mucosal healing

Nasal route is generally lower-risk for such issues but care must still be taken with formulation, preservation, and absorption variability

Research suggests that simultaneous activation of both pathways may produce amplified pulsatile GH secretion compared to either pathway alone