Cysteine HCL is a Non-Essential, Glucogenic, Sulfur-Containing Amino Acid is synthesized in the Liver. Cysteine and Cystine readily convert to one another and have almost identical functions within the body (although Cystine is a less desirable form than "true" Cysteine). Cysteine HCL is Cysteine bound to 23% Hydrochloric Acid (HCl).
Glutamine is an Amino Acid that is an Amide of Glutamic Acid. Officially Glutamine is a Non-Essential Amino Acid, although under certain conditions it may become “essential”.
Leucine is an Essential Branched Chain, Large Neutral, Ketogenic Amino Acid. Of the three Branched Chain Amino Acids, Leucine is recognized as the most important/potent.