You can find out what I've personally found to be most useful for the best results.
There are many different things you can do, however if you have a strong stomach, don't put in more than 8-10 ounces of water, eat plenty of protein, and don't do any of the above, then you should be able to easily and efficiently do all of these things at a much lower cost and with much less effort than a gym membership! Some products in this category do contain creatine, which is a form of the amino acid tryptophan. Some people need a certain level of supplementation to see a significant increase in the amount of strength and power they will have, and in some cases this supplementation may actually be detrimental to health. However, for the most part, you should get all of the supplements you need without having to buy them. There are no guarantees you will get the results you want, so do your research. I personally recommend the products listed here, and the products I review here. I do not make any statements as to their safety or effectiveness, and I am not affiliated with any company or product listed in this article. Some people do get a strong boost from creatine, and some people are not able to tolerate it at all.