ghk - cu dosage GHK-Cu Calculator GHK-Cu Dosage Calculator and Chart

The Hostynek and Maibach group at UCSF measured exactly this in 2011: human skin permeation of GHK-Cu as a function of skin layer, with the result that the peptide accumulates in the upper stratum corneum but does not pass through to viable epidermis or dermis in any meaningful quantity 4

Purification, Characterization and Mechanistic Evaluation of Angiotensin Converting Enzyme Inhibitory Peptides Derived from Zizyphus Jujuba Fruit

Falutz, J., et al

Injectable timelines are not well characterized in published trials, but community planning typically uses 4-8 week cycles for the same reason: change in skin or hair quality is slow to appear

Weeks 4 to 12 (therapeutic phase) use a 2 to 5 percent concentration once daily, targeting active collagen stimulation and repair