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39 (3), e14700

Older adults, for instance, often have reduced stomach acid production, which can make it challenging to absorb B12 from food

It is really very effective

If even one amino acid is out of place, or if the sample is contaminated with solvents, salts, or incomplete fragments from the synthesis process, the results are compromised

(PubMed) Shay KP, Moreau RF, Smith EJ, Smith AR, Hagen TM
