You can cause more harm than good by doing things this way. Amino acids are a good example. Like the B vitamins, they work in synergy, so it's not a good idea to boost just one unless there's a good reason. Sometimes there is. But if I were you I'd educate myself before doing that. See a naturopath, or join a nutrition forum, or get some good books.

Herbs can be dangerous or unhealthful too, if you aren't sure about what you're doing. They can be potent, and they can have side effects. Personally I would stay away from St. John's wort because I will not use any psychotropic drugs. I think it's a rare case that can be helped by this compound as opposed to something else, or to a general positive change in diet.

Hope this helps,
Linda.