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The side effects might be either due to high dose of vitamin B12 or allergic reaction to its composition
But even without that level of customization, understanding the core dosing principles will put you ahead of most researchers fumbling through contradictory information online
Chen, L.K., and Roberts, D.A
In addition to the conditions mentioned above, several risk factors increase the likelihood of B12 deficiency: Smoking Alcohol abuse Endocrine-related autoimmune disorders (such as diabetes or thyroid disorders) Gastrointestinal disorders like Crohns disease History of gastric bypass surgery or other stomach-altering surgeries Optimize Your Health
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