You can easily get another form called hydroxy and in some cases you can get the methylcobalamin
Howden R, Anderson CR, Goldsbrough PB, Cobbett CS (1995) A cadmium-sensitive, glutathione-deficient mutant of Arabidopsis thaliana
But for a large number of people, diet alone isnt enough
According to the FDAs website, Compounding is generally a practice in which a licensed pharmacist, a licensed physician, or, in the case of an outsourcing facility, a person under the supervision of a licensed pharmacist, combines, mixes, or alters ingredients of a drug to create a medication tailored to the needs of an individual patient. This is referring to a 503A or lesser designated compounding pharmacy where compounds are created for patient-specific prescriptions and not for mass production
However, persistently high serum B12 levels warrant medical investigation, as they may indicate liver disease, kidney dysfunction, or haematological disorders rather than simple overconsumption