According to Pecanbread.com, L-Glutamine from Kirklands is SCD legal with the warning that it was reviewed a while back and to be sure to check that all the ingredients are now legal. Apparently, L-glutamine is legal as long as all the other ingredients in whatever brand you buy is also legal.

Hi Gina Marie, \nIt has to be Less Than one gram of carbs. I looked and it is one full carb. Therefore, it's illegal. \nI make my own in my Instant Pot. I am not sure this link will work here; but try it. If not, I will figure another way if you are interested in trying to make it yourself. Be sure ...