Acetyl-L-Carnitine is the O-acetyl derivative of Carnitine - ALC is also naturally present in the body (i.e. it is endogenous) and occurs naturally in small amounts in some foods. Approximately 7.5% - 10.2% of the body’s total Carnitine content is in the form of ALC.
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).