My wife was advised to take as pure as possible a vitamin E supplement as she could find, but all “pure vitamin E oil” products I have found seem to be for skincare rather than consumption as a supplement. 

I understand d-alpha tocopherol to be the “best” form of vitamin E, but find liquid forms often contain sunflower or other oils, which I understand to be a source of but of course are not entirely vitamin E. 

Is a pure liquid supplement possible? And if not, or if it is not common or not advisable, why?