Vitamin A is a fat soluble vitamin, as is Vitamin E. It is most commonly sold in gel caps, with each gel cap containing approximately three drops of an oil solvent. It is available on-line from many suppliers, or is sold in most vitamin and health stores. The most common, and consensus most effective form of vitamin A, is a compound known as retinal palmitate. It is a common human food supplement as well. Depending on manufacturer, gel caps may contain 2000-25,000 iu’s (intravenous units) per gel cap. Read the label to insure you are buying a product with retinal palmitate as the Vitamin A. The solvent may be fish oil, which outside of its odor, is OK.
You can usually find an adequate source at such as a GNC store. When looking online, here’s a link:
http://www.carlsonlabs.com/p-27-vitamin-a-palmitate-15000-iu.aspx
However, if the link has expired, google “Vitamin A Carlson Laboratories” and you should find many product options.