how long does a vitamin b12 injection take to work Are Shots Safe? Royal Palm Beach Medical Group The Truth About B12 Injections:

Usage depends on the specific treatment and individual needs

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Realistic expectations are 0.25-0.5 kg (0.5-1 lb) per week under optimal conditions, with the rate influenced by baseline body composition, dietary habits, activity level, and individual metabolic responsiveness

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chronic liver disease and hepatitis may present with elevated levels Renal impairment : Reduced clearance can contribute to accumulation, though this is rarely clinically significant Solid tumours : Certain malignancies, particularly hepatocellular carcinoma and metastatic disease, may elevate B12 levels [3] Evidence suggests that unexplained markedly elevated B12 levels without supplementation may sometimes be associated with underlying disease

(PubMed) Sellers TA, Kushi LH, Cerhan JR, et al