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does l-glutamine increase glutathione Glutamine Supplementation as an Anticancer Strategy: A Potential Therapeutic Alternative to the Convention Netmeds
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Zhou, H.M., Li, D.C., Wang, Y.Y., Zhu, H., Su, Y.Q., and Mao, Y., Fish Shellfish Immun
They can also block T-cell activation by limiting the availability of cysteine (65)

Vitamin B12 supplementation is considered safe during pregnancy with no evidence of harm to the developing fetus at recommended doses
In order to be glutathionylated, a minimum requirement is that the Cys has a low pKa