I've seen changes in myself due to a number of things, which one(s) may apply to you would depend on your strengths/weaknesses.
If I slack on my multi-mineral supp (equal amounts of cal and mag with a good balance of other stuff, boron, trace minerals, but I assume the cal and mag are the big players here), the transparency increases.
I noticed improvements when I started supplementing D, I was surely very low beforehand. The vitamin D council is a good place to read about supplementing that. I use Carlson products for this.
When I started cod liver oil, the high amount of vitamin A PLUS a weird quirk of my family meant I got very low quickly on K2, so when I upp'd my K2, I saw improvements. I am pretty sure I'm low on vitA, but the other fat soluble vitamins seem more important for me for dental stuff. Thorne K2 is one option, I use a higher dose kind because of my quirkiness, it's a Carlson product, but Thorne should be plenty for most people.
I _do_ supplement a lot, I admit, but this has been a long stretch of time, I'm not playing with everything every week.