how long to feel b12 injection Does a Shot Last? Duration, Benefits & Timing B12 Injection Dosage and Frequency:

If youre breastfeeding, your needs for many nutrients are even higher than they were during pregnancy

B12 injections are necessary for confirmed pernicious anaemia, malabsorption conditions (such as Crohn's disease or following gastric surgery), or when neurological symptoms are present

Inflammatory bowel syndrome, intestinal lymphomas, vomiting or diarrhea are reported to cause problems in cobalamin absorption

Observational studies A large number of cross-sectional and prospective cohort studies have associated elevated blood homocysteine concentrations with measures of poor cognitive scores and increased risk of dementia, including Alzheimer's disease (reviewed in 67, 69)