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If you have any sort of GI issue (GERD, reflux, SIBO/SIFO, yeast problems, chronic constipation, etc.) you will have problems taking oral forms of vitamin B12
While the overall safety profile is favorable, no injectable treatment is entirely without risk, and patients deserve full disclosure before consenting to the procedure
Injectable forms bypass the gastrointestinal tract, making them particularly valuable for individuals with malabsorption conditions such as pernicious anaemia, Crohn's disease, or following gastric surgery
Those with a faster metabolism or severe deficiency might notice the benefits waning more quickly, typically within one to two weeks, especially regarding the energy-boosting effects