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Some mild side effects may include temporary discomfort at the injection site or slight bruising, but these are typically short-lived

doi: 10.1155/2013/194546 96 WeiMZhangGHuangZDingXSunQZhangYet al

Vitamin B12 deficiency is a well-recognized cause of neurological symptoms such as paresthesia, cognitive slowing, and abnormal sensory perceptions, even in the absence of subacute combined degeneration (SCD) of the spinal cord

The "Software Glitch" (Learned Non-Use) When an arm or leg is weak after a stroke, movement becomes difficult and frustrating

It may also occur in people with certain fungal or protozoal infections and in people using other antimicrobial therapies such as herbs

McKinney-Aguirre et al., 2024)