glutathione is an essential tripeptide - The Amazing Detoxification Molecule You Might Not Know Glutathione - Wikipedia
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Oct 2007;28(7):878-83

Measuring psychiatric disorder in the community: A standardized assessment for use by lay interviewers

doi: 10.18632/oncotarget.8604
K.ChowdharyA

Because your body does not readily store excess amounts, toxicity from B12 is very unlikely, even at the higher doses used in injections
Please remember to bring in your lab requisitions, any lab kits, and insurance card for your lab visit
