b12 injection gone wrong Feeling worse after Injection: Answering concerns Possible allergic reaction to B12

These include vitamin B12 deficiency and malabsorption that is caused by the following medical conditions, according to the NIH [1]: Pernicious anemia Tropical sprue Pancreatic insufficiency Surgery in the gastrointestinal tract Certain medications Deficiency in the diet Side effects of B-12 injections Also, according to the NIH, vitamin B-12 injections have some potential side effects, including [1]: Diarrhea Itching Swelling Risk of allergic reaction and anaphylaxis Can Vitamins Aid in Weight Loss

In the stomach, parietal cells produce stomach acid and a protein called intrinsic factor (IF)

Copper serves as a cofactor for lysyl oxidase and lysyl hydroxylase, enzymes essential for collagen cross-linking and structural integrity

In contrast, all 3 measures of vitamin B-12 nutritional status were improved in infants