does b12 injection cause constipation in deficiency is primarily neurogenic, due to autonomic and enteric neuropathy causing slow gut motility • Constipation may precede anemia • Often improves after B12 replacement • Think of B12 Comber - ***New Service- Vitamin
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But in most states, if not all of them, it requires a prescription to be injected
Case 1: A 34-year-old lawyer in trial prep, Bay Street corridor Concern: Borderline-low B12 on bloodwork, with fatigue that crept back between oral supplement doses

It is also worth noting that some research has linked excessive levels of B12 to liver or kidney disease or certain cancers

A Phase I study conducted by Diaz CM et al

Heuvers, Aerts 2012

A more sensitive method of screening for vitamin B 12 deficiency is measurement of serum methylmalonic acid and homocysteine levels, which are increased early in vitamin B 12 deficiency
