GHK-Cu dosage research

How much GHK-Cu should I take?

Published research has not established a safe human injection dose or a daily injection amount. Searches such as how much GHK-Cu should I inject daily or how to take GHK-Cu lead to a gap in the human evidence: validated pharmacokinetic measurements are missing. Pharmacokinetics follows where a substance goes in the body and how it leaves.

An account of dosage would persuade me only if it began with human exposure measurements. The review of delivery and clinical evidence describes a literature dominated by topical work, alongside animal and cell experiments. A concentration that produced a response in a dish cannot answer a human injection question.

Concentrations used in GHK-Cu studies

These quantities identify what researchers tested:

• In human fibroblast cultures, collagen stimulation began between 10^-12 and 10^-11 M and peaked near 10^-9 M. M measures concentration in the fluid surrounding the cells.
• The topical research reviewed for skin formulations includes roughly 0.05% to 2% by weight in creams, serums and gels. A percentage describes the share of ingredient in a preparation.
• The hair combination trial used 50 mg/mL and 100 mg/mL of a 5-ALA + GHK complex. Those concentrations refer to that mixture; the study did not test GHK-Cu alone.

Direct cell exposure, the share of an ingredient in a cream and a combination's liquid strength describe different things. Numbers acquire an undeserved authority, to my mind, after their experimental setting has disappeared. None of these measurements supplies a conversion into a personal injection amount.

Clearance: the rat study and the human gap

The published rat plasma experiment documented rapid conversion of free GHK into a smaller peptide after intravenous administration. Free GHK and copper-bound GHK-Cu have different stability. This experiment concerned rats and the free peptide.

The secondary literature mentions breakdown on the order of 1-2 hours, as summarized in the delivery review. That estimate leaves a validated human GHK-Cu half-life unestablished. It cannot set the timing of repeated injections.

Before trusting that short half-life estimate, I need to know what a human assay actually detects: intact complex, free peptide, copper or a breakdown product. A carefully measured answer would be a substantial advance over borrowing a timing figure from another setting.

Copper retained in skin

The human-skin penetration experiment found about 97 micrograms of copper per square centimeter retained over 48 hours. The skin was outside the body. The retained material was measured as copper, so the figure describes a local copper depot under those experimental conditions.

A depot is a place where material remains available locally. It explains why a skin formulation can have a different exposure pattern from a substance introduced directly into circulation. The copper-safety discussion concerns what remains unknown with prolonged systemic exposure.

Skin retaining copper is an interesting finding in its own right. It leaves the human injection question awaiting measurements in people.