D-Alpha-Tocopherol (natural, free form)
D-Alpha-Tocopherol (natural, free form) is a tier 1 form of Vitamin E, used in 6,282 on-market products .
6,282
on-market products
tier 1
quality tier
n/a
elemental fraction
Why this tier: Natural RRR-alpha-tocopherol has roughly double the human bioavailability/tissue retention of synthetic all-rac-alpha-tocopherol -- the basis for FDA's 1mg-natural=2mg-synthetic label-claim conversion.
Source: Burton GW et al. 1998, Am J Clin Nutr 67(4):669-84, PMID 9537614