Notice how your digestion feels, how your energy fluctuates, and how your skin looks after a few weeks of consistent use
If you're low in vitamin B12 and receive an injection, your body might react to the sudden boost with a headache, nausea, or dizziness
doi: 10.3923/pjbs.2012.418.425 119 BargerJLKayoTPughTDVannJAPowerRDawsonKet al
In this situation, it can be challenging to demonstrate B12 deficiency even when there are typical symptoms (including neuropathy-like paraesthesia and numbness), as serum B12 concentrations may be just within, or sometimes above, the normal range due to the oral supplementation
Regarding the question of what these results tell us about dietary supplementation, this study serves as a reminder of the importance of seeking professional advice when taking supplements