The GP will take a detailed history including: Current medications and supplements (particularly B12 injections or high-dose oral preparations) Alcohol consumption and risk factors for liver disease Personal or family history of haematological disorders or cancer Symptoms suggesting underlying pathology Recommended investigations: Patients with unexplained elevated B12 should undergo: Repeat B12 measurement to confirm persistence, ideally timed away from recent injections or high-dose supplements Full blood count (FBC): To identify polycythaemia, leucocytosis, or other haematological abnormalities Liver function tests (LFTs): Including ALT, AST, ALP, bilirubin, and albumin to assess hepatic function Renal function tests: Urea, creatinine, and estimated glomerular filtration rate (eGFR) Lactate dehydrogenase (LDH): Elevated in haemolysis, liver disease, and some malignancies Further investigations may include: Abdominal ultrasound or CT scanning if liver disease or malignancy suspected Haematology referral for bone marrow examination if myeloproliferative disorder considered Liaison with the laboratory if results conflict with the clinical picture, as immunoassay interference (e.g., macro-B12) may occur In specialist settings, measurement of holo-transcobalamin or B12-binding proteins may be considered The urgency of investigation depends on clinical features and suspected underlying conditions
To achieve blood levels of at least 30 ng/mL, adults living at temperate latitudes (think: anywhere with distinct seasons) need 800 to 1,000 IU per day, ideally from vitamin D3, which is more effective than D2
Most therapeutic protocols use 12-24 week cycles based on research protocols and individual goals
Chen, L.K., and Roberts, D.A
[54] In addition, elevated methylmalonic acid levels may also be related to metabolic disorders such as methylmalonic acidemia
This leads to a feeling of fullness that lasts longer after eating, which can help reduce your overall food intake and support weight loss efforts
