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For example, people who maintain a vegetarian or vegan diet, people with absorption disorders, and those taking prescription meds like Metformin, Proton Pump Inhibitors (PPIs), and H2 blockers like Pepcid are often at greater risk
Green R, Allen LH, Bjrke-Monsen AL et al (2017) Vitamin B12 deficiency
A pill press was also found in a North Carolina mans shed, in connection with a dark web drug shop selling counterfeit pills, according to an FBI affidavit
In this case, the B12 shots have started to heal the damaged neurons myelin sheath, but the neural network in which the healed neuron is in, is in a super sensitive state (with extra receptors), so the patient may feel pain or other unpleasant sensations