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Initial assessment: Serum B12 is measured using immunoassay techniques, with results reported in nanograms per litre (ng/L) or picomoles per litre (pmol/L)

One popular method is to use glutathione cream

Important safety information includes a boxed warning for thyroid C-cell tumors (contraindicated in patients with personal/family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2) and warnings for pancreatitis, gallbladder disease, acute kidney injury, and hypoglycemia risk when used with insulin or sulfonylureas

doi: 10.1086/591626 28 KoedelUAngeleBRupprechtTWagnerHRoggenkampAPfisterH-Wet al

Briefly, selenate and selenite are taken through the plant root via high-affinity sulphate transporter (HAST) and high-affinity phosphate transporter (PHT)