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Two things are needed to absorb vitamin B 12 from food sources: an acidic stomach environment that frees vitamin B 12 from the food matrix a special protein called intrinsic factor that allows vitamin B 12 to be absorbed by cells in the small intestine Poor absorption of vitamin B 12 from food sources is common among older adults and long-term consumers of drugs that reduce stomach acid production

And a symptom timeline

NAD belongs in cells, not in the bloodstream, Guarente explained

Important: Talk to your healthcare provider before starting any new medication, even over-the-counter options, to ensure theyre appropriate for your situation

As your brain and gastrointestinal tract slowly build a biological tolerance to the medication over several weeks, your digestion will regulate, and the burps will vanish

In a recent study, it has been reported that patients with bipolar disorder have low levels of vitamin B9 (folate) (Hsieh et al