why is my b12 injection not working What happens if you inject wrong? Seeing Red: Do B12 Injections

However, there may be other causes why some people with B12 deficiency require more frequent injections

Ex vivo and in vivo study of Sucrosomial() Iron intestinal absorption and bioavailability

A vitamin B12 injection is needed after gastric banding when oral supplementation has failed to correct a documented deficiency, serum B12 remains persistently low, the patient cannot adhere to daily oral tablets, or there are signs of neurological or haematological complications

Additionally, those with vitamin B12 deficiency may benefit from increased mental clarity, improved mood regulation, better sleep quality, and enhanced physical energy

PMC 4968649