National nutrition surveys for some European countries have shown estimated mean dietary vitamin B7 (biotin) intakes for adults of 36 micrograms (mcg)/day (26).

 

In the U.K., the proportion of those not meeting current U.K. national recommendations for B vitamins does not generally exceed 10% (27). More recent recommendations have proposed a requirement of 50 micrograms/day for vitamin B7 (biotin), an intake that is currently not met by 74% of men and 90% of women in the U.K., although biotin intake recommendations remain vague.

 

In Ireland, the mean intake for most B vitamins is generally higher than recommended intake, although for vitamin B7 (biotin) and vitamin B5 (pantothenic acid), a significant proportion of men and women would not meet recent recommendations for these vitamins (28).

 

Large national nutritional surveys in the U.S. were unable to estimate vitamin B7 (biotin) intake due to a lack of data regarding biotin content of food.

 

Smaller studies estimate average daily intakes of biotin to be from 40 to 60 micrograms (mcg)/day in adults (1).