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The magic happens through redox balance - keeping the good guys (reduced glutathione) winning against the bad guys (oxidized glutathione)

That paper is not implicated in the retractions, which is why it is cited here but it studied Nle1-AngIV analogs and did not name or test Dihexa itself

Cysteine concentration regulates cysteine metabolism to glutathione, sulfate and taurine in rat hepatocytes

This decline parallels the slowing of the bodys natural repair processes

These are mechanism findings, not proof that every claimed skin, hair, or anti-aging outcome occurs in humans

In addition, GHK reduced the expression of caspase-3 in the brain ( Figures 1C,D ), and significantly increased the number of surviving neurons ( Figures 1E,F )