Free Amino Acids: the answer for plant stress Thursday, 09 July 2015 Terra-Sorb® | Applied Knowledge In the natural world there are 18 free amino acids which compose the totality of proteins in all living beings. Login to access the full new. If you do not have an user, you can request one. Login Remember Me Log in Forgot your password? Forgot your username? Create an account Leave a comment Please login to leave a comment.