As we age, stomach acid production can decline (atrophic gastritis), which makes it harder to extract B12 from food or pills
[10] [12] Ascorbic acid can also interfere with some laboratory tests, including glucose measurements, creatinine assays, and occult blood tests, potentially leading to false results
Like all vitamins, B12 cannot be produced in the body and must come from the diet
Sublingual tablets may benefit individuals who have low stomach acid, pernicious anemia, gastrointestinal conditions, or difficulty swallowing pills
Thorburn, E
You can add foods such as salmon, tuna, mackerel, or other fatty fish, Vitamin D-fortified milk, and egg yolks in your diet to ensure that you get the right amount of vitamins in your body