Wilburn EE, Mahan DC, Hill DA, Shipp TE, Yang H. An evaluation of natural (RRR-alpha-tocopheryl acetate) and synthetic (all-rac-alpha-tocopheryl acetate) vitamin E fortification in the diet or drinking water of weanling pigs. J Anim Sci. 2008 Mar;86(3):584–91. doi: 10.2527/jas.2007-0377. PMID: 18156353.
An evaluation of natural (RRR-alpha-tocopheryl acetate) and synthetic (all-rac-alpha-tocopheryl acetate) vitamin E fortification in the diet or drinking water of weanling pigs