Table 5.
Estimated maximal percentage of daily reference intake of the eight vitamins that could be provided by the human gut microbiota.
| Vitamin | Intracellular concentration [mmol/gDW] | DRIa [mg/day] | HGMratio | %DRI from HGM |
|---|---|---|---|---|
| Biotin | 9.0 * 10−7 | 0.03 | 0.40 | 4.5 |
| Cobalamin | 8.5 * 10−8 | 0.0024 | 0.42 | 31 |
| Folateb | 5.0 * 10−5 | 0.4 | 0.43 | 37 |
| Niacinb | 3.3 * 10−3 | 15 | 0.63 | 27 |
| Pantothenate | 2.3 * 10−6 | 5 | 0.51 | 0.078 |
| Pyridoxineb | 5.8 * 10−4 | 1.3 | 0.50 | 86 |
| Riboflavin | 9.0 * 10−6 | 1.2 | 0.65 | 2.8 |
| Thiaminb | 8.7 * 10−6 | 1.15 | 0.56 | 2.3 |
a
Dietary reference intakes (Standing Committee on the Scientific Evaluation of Dietary Reference Intakes and Its Panel on Folate, Other B Vitamins, And Choline, 1998). Values averaged for male and female references intakes (ages 19–50).
b
Atomic mass for dihydrofolic acid, nicotinic acid, pyridoxine 5'-phosphate, and thiamine monophoshate.