Taurine is a non-essential Sulfur-Containing Amino Acid. It functions independently within the body (i.e. it is not incorporated into Proteins). It is manufactured endogenously within the Liver from Cysteine and Methionine.
Methylsulfonylmethane is a type of Sulfuric Compound that is naturally present in the body (i.e. it is an endogenous form of Sulfur). MSM is similar in chemical structure to (but claimed to be safer than) Dimethyl Sulfoxide (DMSO) - MSM is the active therapeutic constituent of DMSO and is also an oxidative metabolite of DMSO. It is odorless, tasteless and stable. Its physical format is a white crystalline powder.
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).