b12 injections and headaches Why do I feel worse after a injection: causes explained Vitamin B12 + MIC Injections

(Montreal, Canada) holds the FDA approval and markets Egrifta in the United States

Gastrointestinal conditions Some gastrointestinal conditions may affect how vitamin B12 is digested or absorbed, such as: history of gastrointestinal surgery celiac disease Crohns disease pernicious anemia infections, such as from Helicobacter pylori bacteria or parasites pancreatic insufficiency or cancer bowel cancer folic acid deficiency small intestinal bacterial overgrowth Vitamin B12 injections may be more helpful for people with gastrointestinal conditions than oral products

The cobalamin enters the bloodstream directly and is available to tissues within hours

Hempill-Bryant explains that babies born to B12 deficient mothers will also be deficient in B12, especially if they are then exclusively breastfed. A study in the Journal of Child Neurology found that the most severe cases of B12 deficiency can lead to weakness, failure to thrive, afebrile seizure, developmental delay, nystagmus, tremors, and involuntary movement among young babies

Clients with significant deficiency may benefit from weekly injections initially, transitioning to bi-weekly or monthly maintenance once levels are optimized

For detailed strategies, see our [guide to preventing muscle loss on GLP-1 medications](/guides/glp1-muscle-loss-prevention-semaglutide-tirzepatide-guide)