ghk-cu receptor desensitization evidence Does Really Work? 40 Years of Research Reviewed How GHK-Cu Tightens Loose Skin:
Description
And due to its nutritional importance, food manufacturers increasingly include it in their fortified food formulations, offering high bioavailability as it is already in free form

M., Shamaa, M

Injectable GHK-Cu aims to restore youthful systemic signaling something topical GHK-Cu formulations can do, but not at the therapeutic concentrations achieved via injection
Your pharmacist will advise on likely timing and whether repeat injections may be helpful
