oxidized form of glutathione Safc ʟ-Glutathione oxidized, CAS 27025-41-8 100 g GSSG is composed of two reduced GSH molecules linked by a disulfide bond Glutathione - Wikipedia
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doi: 10.3390/nu13020638

Rarely, and almost exclusively from injections rather than oral supplements

BBC News (in Nigerian Pidgin)

The neurometabolite levels of Glu, Gln, and GABA were assessed in the anterior cingulate cortex (ACC), thalamus, and right temporo-parietal junction (TPJ), with most quantifications passing quality checks

(2018) 42:446456.e1
