what is glutathione gsh Figure 2 from SYNTHESIS Frontiers | Glutathione: Pharmacological aspects

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Conditions susceptible to being B12 deficient: People over 50 Atrophic gastritis, the lack of sufficient stomach acid to release B12 into small intestine Pernicious anemia, which makes it hard for your body to absorb vitamin B12 Digestive disorders such as Crohns disease, celiac disease, bacterial growth, or a parasite Immune system disorders, such as Graves disease or lupus If you suffer from heartburn and take certain proton-pump inhibitors medications or take diabetes medicines such as metformin If you use alcohol excessively

They talk about studies on the GHK-Cu peptide and how it might help

Formulated with a blend of glutathione, vitamin C, fruit acids, and natural brighteners, this lotion helps fade dark spots, discoloration, and uneven tone while deeply moisturizing the skin