They are not bad, but are not necessary either.

If you are going to the gym, you should be taking a PROTEIN powder. Aside from this, teenagers generally don't need any energy boosting supplements.

Teenagers generally have fast metabolisms and lots of energy, so shouldn't need to be taking a huge stack of supplements.

It is your own choice, but it is advisable to learn to use your own energy in the gym before getting assistance from other supplements.

Related Questions:

1. What should I look for in a protein powder and what's the best for me?