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Material is described as produced at a US-based laboratory following cGMP protocols, with the facility unnamed
It was proved that oral 1,000 mcg of B12 is only absorbed by 1.3% of the body, but the absorption rates of B12 shots are between 55% to 97%
Purity: 99% (HPLC verified)
doi:10.1136/bmjopen-2020-047929 Deary IJ, Der G
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