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One reason topical GHK-Cu efficacy varies so much between users is that the peptide struggles to penetrate intact skin
Viscosity is a critical quality attribute because it directly affects pump performance (higher viscosity requires more force to actuate), valve function, and droplet size distribution (more viscous formulations tend to produce larger droplets with reduced aerosol fineness)
Responses are measured on a scale of 1 to 5, with 5 being the best score
Daily consistency for at least 48 weeks matters more than chasing one "perfect" dosing hour.
For muscle and joint injuries, doses usually fall between 250 and 500 micrograms, often split into multiple administrations daily
PLOS ONE 9 , e109727 (2014)
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