It has been studied in preclinical research for its ability to promote synaptic formation and strengthen neural pathways
And even some meat eaters dont absorb it as well as they might
Platelet counts and concentrations of fasting blood sugar (FBS), hemoglobin A1c (HbA1c), immunoreactive insulin (IRI), high-density lipoprotein (HDL) cholesterol, low-density lipoprotein (LDL) cholesterol, triglycerides, non-esterified fatty acids (NEFA), aspartate aminotransferase (AST), ALT, -glutamyl transpeptidase, ferritin, and type IV collagen 7 were measured using standard laboratory techniques before and after glutathione treatment
10.1016/j.chom.2013.10.009 Cell Host Microbe
A B12 test can show if your symptoms are due to pernicious anemia rather than cancer
10.3390/ijms25105122 Int