In addition, people who have pernicious anemia (a condition caused by autoimmunity to stomach cells that produce intrinsic factor), celiac disease and other illnesses of the small intestine, those who have undergone gastrointestinal surgery, and vegans/vegetarians are also at risk for vitamin B12 deficiency
The powerful connection between B12 metabolism support and improved energy levels is why this treatment has become a cornerstone in many of our custom health and weight loss programs
JAMA 301 , 21292140 (2009)
Hirano, K.-I., Ikeda, Y., Zaima, N., Sakata, Y
Redness at the injection site, mild bloating, and a few days of adjustment are the norm, while the more serious reactions that require medical attention remain rare and are usually preventable with proper dosing, sourcing, and technique