It wouldn’t hurt to take both D and D3, but you should definitely take vitamin A if you’re going to take either of these. You can usually find a supplement containing both vitamin A and D in one soft-gel pill, and the soft-gel form is what you want to purchase.
You may want to look for a milk thistle brand that has the ingredients listed.
It can be difficult to find A, D, or D3 vitamin supplements that do not contain soy bean oil. I took one containing soy bean oil throughout my entire treatment and still managed to reach a cure. Sometimes the positive effects outweigh the negative, so you have to look at both sides.