Because its relatively safe, However, vitamin B12 has been shown to cause rare side effects in some cases
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It could be that you need to address a vitamin deficiency
Here are just a few key functions of B12: Supports red blood cell formation and oxygen transport Helps maintain nerve function and brain health Plays a role in mood regulation and focus Supports energy metabolism and fat/protein breakdown When your body doesnt get enough, symptoms like fatigue, brain fog, irritability, and weakened immunity often show up
Jelovac, N., Sikiri, P., Rucman, R., Petek, M., Perovi, D., Konjevoda, P., Marovi, A., Seiwerth, S., Grabarevi, Z., Sumajstorci, J., Dodig, G., & Peri, J
Some vials run a bit higher at 1.1%, but 0.9% is the standard