The real risk is metabolic, not pharmacokinetic
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If greater than 14 days, you must go back to starting dose of 0.25mg and titrate back up every 4 weeks to the desired dose
Minozzi M, D'Andrea G, Unfer V, et al

Product Specifications Application Ideas & Example Formulation Concepts Concept 1: Urban Anti-Pollution Radiance Serum GHK-Cu level : 0.05% Format : Aqueous gel serum Target pH : 5.5-6.0 Sensory profile : Light, fast-absorbing Co-actives : Hyaluronic acid, niacinamide, antioxidant complex Positioning : Daily defense against environmental stressors with anti-aging benefits Concept 2: Firming Eye Contour Gel GHK-Cu level : 0.02% Format : Light O/W emulsion Target pH : 5.5 Sensory profile : Non-greasy, quick absorption Co-actives : Caffeine, ceramides, peptide complex Positioning : Reduces visible signs of fatigue and aging around the delicate eye area Concept 3: Densifying Scalp Booster Spray GHK-Cu level : 0.1% Format : Leave-on scalp tonic spray Target pH : 5.0-6.0 Sensory profile : Lightweight, non-sticky Co-actives : Caffeine, rosemary extract, zinc PCA Positioning : Supports hair growth and scalp vitality for thinning hair Concept 4: Renewal Bi-Phase Serum GHK-Cu level : 0.05% Format : Bi-phase serum Target pH : 6.0 Sensory profile : Quick-absorbing, silky finish Co-actives : Panthenol, mild AHA blend Positioning : Nighttime skin renewal with gentle exfoliation Practical Tips for R&D and Scale-Up Processing Guidelines Addition timing : Incorporate pre-dissolved peptide in aqueous phase at cool-down (below 40C) Avoid : Prolonged high-shear mixing at elevated temperatures Validate : Hold times between manufacturing steps Quality Control Checklist Packaging Recommendations Airless pumps are preferred for oxygen-sensitive formulations Opaque containers minimize light exposure Consider an aluminum overwrap for additional protection Avoid excessive headspace in containers Stability Testing Protocol Ensure the GHK-Cu complex and overall system maintain integrity throughout the intended shelf life under these conditions

Besouw MT, Holewijn S, Levtchenko EN, Janssen MC (2011) Non-invasive measurements of atherosclerosis in adult cystinosis patients