glutathione vs glutathione reduced L-Glutathione vs. Glutathione: What's the Difference? File:Glutathione Reductase and Peroxidase Graphic.jpg – Glutathione & Glutathione Reduced |

That is a much safer option

Xenobiotica 28 , 443456 (1998)

The bulk of the hair-relevant data is in vitro (cells in dishes) or ex vivo (isolated follicles in culture), andas we will seea large share of the most-cited follicle-elongation evidence used a closely related but distinct peptide, AHK-Cu, not GHK-Cu itself

When chased to a source, such figures generally attach to small studies, non-standard endpoints, or combination protocols (for example, a peptide paired with a photosensitizer or a procedure), and they do not represent GHK-Cu monotherapy in a rigorous trial

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Topical GHK-Cu products is usually the more tolerated product for all skin types