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glutathione at walgreens Codeage Liposomal 1000 mg making it suitable for individuals with specific dietary restrictions Codeage Liposomal Glutathione Beyond Vitamins
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If you are someone who hasnt been responding well to your B12 supplements then you may want to consider a trial of B12 shots

International journal of biomedical science : IJBS

doi: 10.1371/journal.pone.0095452

doi:10.1007/s10103-017-2195-9 Colombo F, Marques AM, Carvalho C, et al

The peptide does not significantly cross into most other tissues
