Best vitamins/pills to take while going through puberty?

First of all, get your blood tested so you can supplement what you actually need and don't get hypervitaminosis. Those are safe to consume for most people;

1. 1g Magnesium glicinate/threonate
2. ~4000UI D3
3. 100mcg K2 MK7
4. 1g C
5. B complex (DYOR on the dosing, but more is generally better on B's)
6. 5mg melatonin
7. 10g creatine

Also get calcium, zinc and proteins through diet, do not supplement them unless needed.