how many peptide bonds in glutathione Peptide bond - Wikipedia
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(2019) In vitro and i n vivo anti-aging effects of compounds isolated from Artemisia Iwayomogi

DOI.org (Crossref) , Molecules , vol

GCL is composed of a heavy or catalytic (GCLC, Mr ~ 73,000) and a light or modifier (GCLM, Mr ~ 30,000) subunit, which are encoded by different genes in species as divergent as humans and fruit flies (Yan and Meister, 1990

So, the next time you place that vial back into its cool, dark spot in the refrigerator, know that you're not just following a rule
Experimental Dermatology, 28 (3), 219-224