A standard B12 test only measures what circulates in the blood, not what actually goes into the cells or what reaches the nerves.
In older adults, it is very common for B12 to be listed as “normal” in the laboratory, while the nervous system continues to deteriorate.
This happens because, with age, the production of stomach acid and intrinsic factor, two essential elements for properly absorbing B12, decreases. Without them, much of the vitamin simply passes through the body unused.
Mistake 1: Taking B12 as a common pill
Many older people swallow B12 with water, just like any other vitamin.
The problem is that this method depends entirely on the stomach and intrinsic factor, which are usually reduced after the age of 60.
Therefore, even if the dose is high and constant, absorption may be minimal.
The solution:
Sublingual forms (which are placed under the tongue and allowed to dissolve) allow B12 to be absorbed directly through the tissues of the mouth, bypassing the stomach. In older adults, this change alone can make a big difference.