L-Glutathione is formed by linking of 3 amino acids, namely Glutamin Acid, Cysteine and Glycerine
Pharmaceutics 15 (6), 1578
Funding This study was supported by the STI2030-Major Projects (No.2021ZD0201802)
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Basically a study looked at 100 drugs & found that 90% of them were fully potent 15 years after their expiration date, though that may vary by drug, and perhaps liquid forms are a bit more vulnerable (perhaps)