Is a liquid vitamin E supplement possible without additives? Looking at E vitamin products sold commercially, all “pure vitamin E oil” products seem to be for skincare rather than consumption as a supplement. 

I have read that d-alpha tocopherol is the form of vitamin E with greatest bioavailability, but even liquid supplement products often contain sunflower or other oils in addition, which I understand to be a source of but of course are not entirely vitamin E.

Is a pure liquid supplement possible or practical for consumption as a supplement, and if not, why?
Vitamin E is not soluble in water. It is only soluble in oils. So it is no use swallowing pure Vitamin E, or this vitamin with water. It will poorly be absorbed by the intestine. You must absorb it in an oily solution.