21 Aug 2015 --- According to a new Public Library of Science (PLOS) ONE study, 87% of 20-30 year old and 68% of 31-50 year old Americans are not maintaining optimal serum α-tocopherol concentrations. The criterion of adequacy for vitamin E used in the PLOS ONE study was a serum α-tocopherol level of 30 µmol/L1.
