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 and Non-Essential Amino Acids. Any time you consume protein, your body receives a source of amino acids. Your body uses combinations of 20 distinct amino acids to make up the protein in your cells. Dietary amino acids fall into two categories: non-essential amino acids, which your body can produce on its own, and essential amino acids, which your body cannot produce and therefore requires as part of your diet.