Oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less in people with low intrinsic factor, atrophic gastritis, or gut absorption issues
Cancer 10 , 103110 (2019)
Glutathione peroxidase, glutathione reductase and glutathione transferase activities in the research-subject artery, vein and heart
The problem is that our B12 levels naturally decline with age, making it that much more difficult to keep our B12 levels healthy, and that much more important to supplement with B12 as we age
Neuroregulation : It interacts with the nitric oxide (NO) and dopamine systems, potentially aiding in nerve repair and mood stabilization
Now, while injectable B12 is generally very safe, it is important to be aware of potential side effects