My faves are:
B-Complex (Solaray or Trader Joe's)
Why? Because I avoid taking "lone-wolf" supplements even pure Biotin. I think all supplements work together for the right results. Sometimes I think that adverse effects occur when we take too much of one nutrient and ignore everything else that it needs to perform.
Silica
Why? The sheeen it gives to HS&N. Everytime I try something else, I drag myself right back to silica's door.
Vitamin C (whole-C tablets or liquid form)
Why? Because it allows the body to absorb the other supplements like a champ. It also keeps me alert and healthy. Love it.
Pending approval:
Gelatin
Specs: I've been taking this for a little over a week because I hear it's good for thickness. So far, it has lived up to its reputation. I haven't spot-checked my hair yet. But, my nails are like cement at this point (even my rebellious ones). I'll have a full review by the end of june.
Wishlist:
MSM
Why I want it: I hear it lengthens the anagen phase which allows hair to remain in the growth phase longer than usual.
Why I haven't taken it yet: I'm scurred. I've heard some startrek-like side effects and I'm afraid to dive in. If I ever take it, it will be over the summer.