PLoS Med 17, e1003084 (2020)
Glutathione is a highly abundant, low-molecular-weight tripeptide found in virtually all mammalian cells, often celebrated as the body's most critical endogenous antioxidant
(PubMed) Vazir S, Nagalla B, Thangiah V, Kamasamudram V, Bhattiprolu S
This, in turn, should help boost absorption of nutrients
Luminescence 33:243248 Kong L, Chu X, Ling X, Ma G, Yao Y, Meng Y, Liu W (2016) Biocompatible glutathione-capped gold nanoclusters for dual fluorescent sensing and imaging of copper(II) and temperature in human cells and bacterial cells
(Some women apply retinols on alternating nights or twice weekly to avoid the skin irritation that can come with daily useor skip it altogether and just use GHK-Cu peptides topically.) If you have sensitive skin thats irritated by either retinol or vitamin C, then using a GHK-Cu peptide can be an effective and non-irritating option to promote collagen synthesis in the skin