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FYI: People with B12 levels under 200 picograms per milliliter (pg/mL) are considered to have a deficiency
Because cobalamin in normally absorbed from food through the gastrointestinal tract, chronic diseases that adversely affect the ability of the intestines to absorb nutrients (inflammatory bowel disease is an excellent example) can lead to cobalamin deficiency
The Cochrane Database of Systematic Reviews
Anant Vinjamoori, a Harvard-trained longevity expert, as chief medical officer of Hims
If fermented foods aren't a regular part of your diet, a probiotic supplement can help fill the gap
Week 1-2: 50 mg daily to assess GI tolerance, energy changes, and side effects
