I wonder if you'd be able to tolerate hydroxy-B12 or methyl-B12 instead... Cyano-B12 is the commonly prescribed type of B12, and it is also used to fortify foods. But this form requires conversion to methyl or hydroxy B12, which may involve the CYP enzymes in the liver.
So you need to find things that are already converted to the downstream form, so to avoid the need to utilize the CYP enzymes.
Also, sometimes supplements & medications administered via skin, injection, or nasally will bypass the liver. You need a biochemistry trained super smart doctor who knows how supplements and meds are metabolized to assist you with this. I hope and pray the Dr. in Oregon can help you.
Chronic Lyme, Bart., Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut dysmotility & non-specific inflammation, Lupus, Osteoporosis, etc.; G-Tube
Meds: Flagyl, Domperidone, Zofran, Claritin, Andrographis & other herbs, homeopathy, supplements, etc.