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.
Essential amino acids. Humans can produce 10 of the 20 amino acids. The others must be supplied in the food. Failure to obtain enough of even 1 of the 10 essential amino acids, those that we cannot make, results in degradation of the body's proteinsâmuscle and so forthâto obtain the one amino acid that is needed.