I have been look on this site to find a simple recipie for a vit. c serum that contains just Vitamin C, ferulic acid and vit. e, w/out all the other extras. Does anyone have one and can I use vit. E capsules or should I order tocopherol acetate (that's the same thing, right?). I tried BulkActives but they are out of ferulic acid. I just don't know what ratios are correct. thank you so much!