Traditional oral glutathione often gets broken down into its constituent amino acids before it can be absorbed as a whole molecule, rendering it less effective
[DOI] [PMC free article] [PubMed] [Google Scholar] 27.Barisic I., Balenovic D., Udovicic M., Bardak D., Strinic D., Vlainic J., Vranes H., Smoday I.M., Krezic I., Milavic M., et al
As such, it does not have a brightening or antioxidant benefit to the skin
Similarly, GABA (Gamma-Aminobutyric Acid), a neurotransmitter known for its calming properties, is also being studied for use in nasal sprays
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