From this ( http://www.alliance-natural-health.o...siteDoc_26.pdf ) pdf:
"Detailed intake data on vitamin B12 in EU countries are scarce. Recently, average intakes of 4.9 and 3.9 µg/day were reported for adult men and women, respectively, from a representative household survey in The Netherlands, using a two-day dietary record method
(Blokdijk et al., 2000). The mean vitamin B12 intake in Dutch elderly subjects was about 5 µg/day, with a range of 0.5-16.9 µg/day from dietary intake, and up to 32 µg/day for the total
intake (including supplements) (van Asselt et al., 1998).
Data from Ireland (IUNA, 2000) indicate a mean vitamin B12 intake from all sources (food + supplements) of 5.4 and 4.1 µg/day for men and women, respectively. The upper 97.5th
percentiles were 15.0 and 15.1 µg/day, respectively. Mean intakes from food sources only were 5.2 and 3.6 µg/day, for males and females, with upper 97.5th percentiles of 13.1 and 11.8 µg/day, respectively.
Data from the United Kingdom (HMSO, 1990) indicate a mean vitamin B12 intake from all sources (food + supplements) of 7.3 and 5.4 µg/day for men and women, respectively. The upper 97.5th percentiles were 23.0 and 18.2 µg/day, respectively. Mean intakes from food sources only were 7.2 and 5.2 µg/day, for males and females, with upper 97.5th percentiles of
22.9 and 17.8 µg/day, respectively. Data from the Boston Nutritional Status Survey on vitamin B12 supplement use among elderly show that the median (percentile 50) intake from supplements is 5 µg/day for males and 6 µg/day for females (total intake from diet + supplement: 9.7 and 9.0µg/day, respectively); the percentile 95 intake from supplements was 77 µg/day in men and 100 µg/day in women, and the corresponding values for total intake were 83 µg/day in men and 106 µg/day in women,
respectively. Data from NHANES III (USA) give a highest mean intake from diet + supplements for males (31-50 years) of 17 µg/day, the percentile 95 intake in pregnant females was 37 µg/day (data taken from FNB DRI Report, IOM, 1998)."
This study showed that the mean intake of B12 among female Japanese college students were v4.4. (+-.4.1) MU.g.
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