MadSci Network: Biochemistry

Re: What is the factor to convert IU to micrograms?

Date: Tue Jul 28 08:52:08 1998
Posted By: kathi clement, faculty md, family practice, Univ. of Wyoming
Area of science: Biochemistry
ID: 901235618.Bc

Good question Rob, but there isn't an easy answer.

The original international standard for Vit. E (dl-alpha tocopheryl acetate) had one mg equivalent to one IU of Vit. E. This is no longer available.

There are several other compounds or components of Vit. E which are measureable but there is variation of how many IU are equivalent to how many mg.

Vitamin A is no easier... 1 retinol equivalent is equal to 1 microgram of retinol, or 6 micrograms of Beta-carotene or 12 micrograms of other provitamin A cartenoids or 3.33 IU vitamin activity from retinol or 10 IU Vitamin A activity from beta-carotene. This information came from the National Research Council's Recommended Dietary Allowances. Probably, the best bet is accept what is on the label, if you're buying Vit E supplements and it states 400IUs accept this and not worry about how many mg there are. Good luck and I hope I haven't confused you more.

Current Queue | Current Queue for Biochemistry | Biochemistry archives

Try the links in the MadSci Library for more information on Biochemistry.

MadSci Home | Information | Search | Random Knowledge Generator | MadSci Archives | Mad Library | MAD Labs | MAD FAQs | Ask a ? | Join Us! | Help Support MadSci

MadSci Network,
© 1995-1998. All rights reserved.