I used to take a variety of aminos. Be very careful, some can really fuck with your mental health. The only one I still take (after a lot of research) is Acetyl L-Carnitine. Mainly they are fat burners, so if you are not have any fat burning issues then don't bother with them until you get older. But definitely do your research. If you can get a copy of Prescription for Nutritional Healing, by Phyllis A. Balch CNC, it is just about the best book there is around for information about vitamin and herbs (and I have a lot of nutrition and vitamin books). I order the Acetyl L-Carnitine from herbstoreusa because they sell in bulk at a very reasonable price and buying it in capsule form is very expensive . One thing you need to know about aminos is that you need to be sure to drink plenty of water. Not a lot of water, just be sure to drink a normal daily allowance. Be careful though because again there are some aminos that you should not take for a long term because they can fuck with your body, not only your mental state, but they can weaken your heart and liver and more.