What that means isnt always straightforward: In the Swiss study mentioned above, nearly three-quarters of primary-care docs surveyed reported using a multi-step approach (and not always the same one) when testing for B12 deficiencya practice that Miller says improves the odds of an accurate diagnosis since serum B12 levels alone dont always accurately identify a deficiency
Certain groups are at higher risk, including older adults (due to reduced stomach acid production), individuals with pernicious anaemia (an autoimmune condition affecting B12 absorption), those who have undergone gastrointestinal surgery, and people with conditions such as Crohn's disease or coeliac disease
If you need someone to give it to you, consider using the deltoid/shoulder
In animal studies, no observable adverse effects were reported, and the compound did not affect food intake or inhibit related enzymes
Additionally, B12 helps your nerves stay healthy, so your body can move smoothly
Afterward, there are some mild side effects including redness, swelling, bruising (pretty rare), firmness, tenderness, itching, and/or skin sensitivity