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This occurs in conditions such as pernicious anemia, an autoimmune condition that affects the production of intrinsic factor, which is necessary for the absorption of B12 in the small intestine

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Container choice: Opaque, airtight glass bottles with dropper tops or airless pumps minimize air exposure and contamination

You should always opt for stocking up on pure and efficient methylcobalamin-based B12, making sure to read the ingredients label carefully for any hidden nasties, and reach for a daily dose that will meet your requirements, plus some to ensure absorption (2000mcg weeky for adults under 65 should do the job just fine!)

Lau and A

(PubMed) Wu K, Helzlsouer KJ, Comstock GW, Hoffman SC, Nadeau MR, Selhub J