ghk-cu injectable dosage recommendations for adults and Protocol: A Medical Provider's Guide to the 30-Day Cycle GHK-CU aka the beauty peptide.
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doi: 10.1016/j.actbio.2022.07.066
Rapid automated diagnosis of diabetic peripheral neuropathy with in vivo corneal confocal microscopy

Protective effects of estradiol and dihydrotestosterone following spinal cord injury
That's the basic reasoning behind stacking them

Apply from lightest to heaviest: serums first, then creams

King J, Kern MH, Jaar BG