Amino acids, depending on the store, will have their own section, or will be in the body building section. They usually come in a rather large bottle, and will tell you the amount to take on the label. They're large pills, because they have so many things in them, and you usually take 2 or 3 at a time. If you don't like pills, you can get whey protein, in a 2 lb. tub, and drink a few protein drinks through the day, if calories aren't a problem for you. One drink is about 80 to 100 calories without flavorings like fruit or extract's. But this may not be enough of a concentration for the anxiety. Also if you don't want to take so many large pills, I know GABA alone, is considered to be nature's valium. I take it at bedtime for insomnia, and I sleep straight through. 5-HTP is also good for smoothing out nerves and anxiety. I still suggest the large bottle of free form amino acids, but the other's I mentioned will help the anxiety as well. And they aren't that expensive (unlike prescriptions). If you like to read, I highly recommend "The Diet Cure" by Julia Ross. It's in paperback now, and she has a website. She does amino acid therapy, and can further direct you to certain supplements. I found her extremely helpful.