How Much Vitamin E Does An Adult Need? According to the National Institutes of Health (NIH), the U.S. Recommended Daily Allowance (RDA) for adults older than 14-years is 15 mg (or 22.4 IU); pregnant women of any age should get 15 mg (or 22.4 IU); and breastfeeding women of any age should take 19 mg (or 28.4 IU).
The nonessential amino acids are alanine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine and tyrosine. 1  The Biology Project: The Chemistry of Amino Acids.  The Health Professionalâs Guide to Popular Dietary Supplements; Allison Sarubin-Fragakis, et al.
A total of 9 amino acids are considered essential, while another 11 or so can be synthesized from the essential amino acids. There are other amino acids that appear in nature that are not included in protein structure. These odd amino acids appear especially in plants, where they may have roles as insect deterrents.