b12 still low after injections How Often Should I Get Shots? A Guide to Your Schedule B12 Shots & B12 Injections:

Dehydration exacerbates headaches, dizziness, and fatigue

They can be easily recognized by primary care physicians by their multiple complaints, negative physical examination results, and a history of multiple medical examinations . Now, lets consider the level of rigor by which people with unexplained symptoms have been examined in the past

If you have pernicious anemia, you may see improvement relatively quickly, says Miller, since it only takes three to four days after a shot for your body to begin producing red blood cells

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[1] [6] Severe deficiencies may include symptoms of reduced heart function, suppression of bone marrow, as well as more various severe neurological symptoms possibly including sensory loss, abnormal balance and reflexes, memory and consciousness impairment, smell and taste problems, depression, irritability, confusion, and psychosis

Marking the date of first use on the label can be helpful