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As people age, glutathione production also decreases

Short-term support: For those with active lifestyles, post-workout resilience and physical well-being may be noticeable within a few days of consistent use

2004 Aug;52:632-40

This dual protocol addresses aging at both the cellular and dermal level

For researchers, the relevant cautions are (a) most of this work comes from a small number of laboratories with overlapping authorship across decades, and (b) the in vitro concentrations at which effects are reported (sub-nanomolar to nanomolar) are within the plasma-concentration range claimed for endogenous GHK, but human plasma concentrations themselves rest on a thin measurement base