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In addition to impacting the speed of absorption of oral supplements, the digestive process also affects the extent of absorption, with 40%-50% of low-dose B12 vitamins being absorbable

Supporting a dominant role for diet composition in establishing the Firmicutes : Bacteroidetes ratio, previous work has shown that mice maintained on a high-fat diet had a similar cecal Firmicutes : Bacteroidetes ratio to those maintained on a high-carbohydrate diet 77

Their benefits are most noticeable in people who have low or borderline B12 levels, absorption challenges, or increased needs

In vivo , they found that NNMT knockdown in the livers of C57BL6/J mice significantly lowers overnight fasting glucose levels [14]