US$ 24.50
arbor assays glutathione Assay for quantitative determination of and glutathione disulfide levels using enzymatic recycling method Cellular glutathione peroxidase Glutathione (GSH) Assay Kit Sigma-Aldrich
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However, its recommended that people who are pregnant or breastfeeding have 2.6 and 2.8 micrograms of B12 a day, respectively, per the NIH says

doi: 10.4103/jpbs.jpbs_207_24

Patient safety issues in the GLP-1 space this week We agree with the first commenter on this Reddit post from August 6

These are research-grade products, not pharmaceuticals