Why Its Not Ideal for Self-Injection While the upper arm is a convenient spot for a professional, its not the best choice if youre administering the shot yourself
Moreover, individuals who are malnourished, have cancer, are elderly, pregnant, or are alcoholics are also at higher risk in suffering the lack of vitamin B12
Nasser Nasseri, M.D
Vegans and Vegetarians: B12 is found almost exclusively in animal products, so those on plant-based diets must use fortified foods or supplements Older Adults: reduced stomach acid can decrease B12 absorption from food as we age People with Pernicious Anemia: this autoimmune condition prevents the body from making intrinsic factor, a protein needed for B12 absorption Individuals with Gastrointestinal Conditions: diseases like Crohn's or Celiac disease can impair nutrient absorption Patients Who Have Had Gastric Surgery: procedures like gastric bypass can reduce the body's ability to absorb B12 Certain Medications: drugs such as Metformin and proton pump inhibitors (PPIs) can interfere with B12 absorption It's important to distinguish between using vitamin b12 injectable for humans for a diagnosed medical need versus for general wellness

An example is: Vedolizumab (brand name: Entyvio) Interleukin (IL) 12 and IL-23 antagonists block two cytokines (chemicals made by cells that affect other cells, specifically IL-12 and IL-23) from causing swelling in Crohns disease and ulcerative colitis
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