There are a total of nine essential amino acids. These are: Valine, Isoleucine, Leucine, Threonine, Histidine, Lysine, Phenylalanine, and Tryptophan.
its considered a drug because it messes with your brain just like a drug would do.
2000 to maintain your current weight.
1500 to lose exactly one pound per week.
I hope this helps! :)