The word liposome can describe a delivery carrier or a component of an experimental barrier. Confusing those roles can reverse the meaning of a formulation study. Primary study
What was studied
Researchers investigated copper complexes involving GHK and glutathione in a Franz diffusion-cell system. A liposome-based membrane with selected skin-barrier-like properties served as the model barrier. The work examined transport in that controlled system, rather than testing a finished liposomal cosmetic on living human skin. Primary report
Our appraisal: identify which component plays which experimental role
A carrier holds or associates with the compound being delivered. A barrier separates donor and receiver compartments. Both can involve lipids, but they answer different questions. Calling the barrier a delivery vehicle would misdescribe the experiment.
Artificial membranes are useful for controlled comparisons, yet matching selected physical properties does not reproduce every function of skin. Appendages, metabolism, tissue binding, and the arrangement of living and nonliving layers can change transport.
The measured analyte also matters. Copper transport and intact complex transport are not automatically identical. A reliable interpretation needs the analytical method to establish what crossed and whether the complex remained intact.
Permeation through the barrier should also be separated from retention within it. Material that accumulates in a membrane can have a different fate from material recovered in the receiver compartment. Neither observation alone defines delivery to a particular tissue target.
The study belongs in the evidence base for model-system transport methods. It should not be used as proof that a modern liposomal GHK-Cu product reaches the human dermis, improves wrinkles, or achieves a specified systemic exposure.
Frequently asked questions
What apparatus was used?
A Franz diffusion-cell system.
Did liposomes help form the model barrier?
Yes.
Is a barrier the same as a delivery carrier?
No.
Were living human cosmetic users studied?
No.
Is copper detection always intact-complex detection?
No.
Are retention and through-barrier transport identical?
No.
Does this establish a finished product's efficacy?
No.