Peptide Nasal Spray vs Injection: Delivery Methods Compared Synapsin Nasal Spray Wells Pharmacy Network Are GHK Cu Injections Safe Enough? Alternatives Options Neurogan Health KPV GHK Cu (10 50 MG) Sigma Compounds 2 weeks in on GHK Cu and the glow is REAL., Brighter complexion, More even skin tone, Less breakouts, Softer fine lines, Thicker, fuller hair, This is just the beginning. Consistency is are peptide nasal sprays as effective as injections Alternative Guide injections provide the most reliable systemic delivery of peptides