Older adults over the age of 60 because the stomach lining produces less stomach acid as we age which is needed to absorb B12
If you want to know why do I feel tired after B12 injection, let's explore
Declining NAD+ impairs energy, metabolism, skin health, and immunity, accelerating biological aging.[12][13] Research indicates that this loop can be interrupted by boosting NAD+, potentially reversing aspects of biological age as measured by epigenetic clocks
Vitamin B12 injections are a vital treatment for those with pernicious anaemia, a condition characterized by a lack of intrinsic factor a protein that binds and absorbs vitamin B12
The direction and magnitude of these changes depend on the cell type, inhibitor concentration, exposure time, and assay design