So injecting beyond a certain point may cause your cells to fight off the excess B12 so hard that it might reduce the amount of active cellular B12 - probably not to dangerous levels, but possibly sufficient to trigger some symptoms
PMC5333585 Chang, C.H., et al
Each procedure is normally completed within a span of 20-30 minutes
Many people will also experience cognitive difficulties such as problems with vision, memory, thinking, or reasoning, the development of mental illnesses such as depression, or general changes in behavior
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