Supplementation studies which have utilized exogenous forms of glutathione are not that common due to the poor ability of glutathione to stay intact throughout the cell with most of it being found to be degraded in the extracellular compartment[18]
Intravenous (IV) glutathione the most common method for brightening
There is credible human and human-cell data on GHK-Cus skin effects improvements in skin appearance, collagen-related markers, and gene expression but these speak to skin, not to counted hair regrowth
doi:10.1146/annurev.bi.52.070183.003431 Mezzetti F, Vero L de, Giudici P (2014) Evolved Saccharomyces cerevisiae wine strains with enhanced glutathione production obtained by an evolution-based strategy
It also boosts the performance of other antioxidants, including CoQ10, vitamins C and E, and alpha lipoic acid
However, it can help break the histamine down faster which may decrease your reactions severity or duration