I've never tried Nature's Gate, but I used to have really bad acne...unfortunately I went vegetarian at about the same time as I started the big P, so I can't tell you if they were related.  Eventually, the doctor put me on a really strong vegetarian-source vitamin complex for like, 6 months, and then a normal veg. vitamin after that.  The first vitamins were too strong for long-term use, but when combined with gentle exfoliating and not putting anything on my face, it really cleared everything up.  It could be that your diet was bad - if you weren't raised vegan like I wasn't, there's a good chance it will take a while before you get it right.  Diet is so complicated, you think you're doing everything just right and then you realize you've been screwing up on something you've never thought of.  Frustrating.  :-[

I've also heard sudden acne can be a sign of a detox, but if it's been two years, that's probably not the case for you.  Actually the vitamins made me break out a little worse at first, then got much better, and some of my blood work came back better, too.

I do the same thing now as pretty-in-punk, except I use a gentle exfoliater on my face once every week or so (not a scrub, it uses fruit acids.)  I break out a little afterwards, near my hairline, but it keeps my face from building up dead skin, which is a main cause of my acne.  I also use a rosewater-based cleanser called "Naked Rose" that is really gentle, if I'd had to put anything on my face, like sunblock or makeup.