does l glutamine increase glutathione restores testicular glutathione-dependent antioxidant defense and upregulates NO/cGMP signaling in sleep deprivation-induced reproductive dysfunction in rats Molecular mechanisms by which glutamine
Description
Glutathione is a bit more subtle as a reducing agent let me explain what I mean by that

Risks The NIH reports that in those with confirmed deficiency, B12 injections can have important benefits

Vegetarians may also be at higher risk of a potential deficiency

Neuro endocrinology letters
[DOI] [PubMed] [Google Scholar] 92.Spinnato J.A., Freire S., Pinto ESilva J.L., Cunha Rudge M.V., Martins-Costa S., Koch M.A., Goco N., Santos Cde B., Cecatti J.G., Costa R., et al