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Description
While rare, these do exist

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

In this model, the pharmacy bills the patient or their insurance directly

AAFP (2017, with ongoing relevance)
Vitamin B12 is essential for red blood cell production, stamina, appetite stimulation, and overall equine performance
