amateur trying to isolate niacinamide

So I'm a chemistry major, and I do great in school - but it occurred to me recently that I rarely use my knowledge in any practical way in my real life. I used to buy a pretty expensive formulation of niacinamide gel for my acne... I decided to try to make it on my own from the much cheaper capsules you can buy at Walmart.

I just want to see if this makes sense. I know niacinamide (vitamin B3) is very water soluble, and heat stable, and non-toxic. The capsules I bought have "whole rice concentrate" as a filler, which is apparently rice bran and germ. If i dissolve the contents of the capsules in hot water and then run it through filter paper to remove the filler, I should get a decent solution of niacinamide right?

I case you're wondering, I'm just going to mix this solution with prepared aloe vera gel to make my final product. Niacinamide was the only active ingredient in the cream I used to buy, so if i work the concentrations out correctly I think i should get a good quality substitute.