Hair Growth Product "This product has helped my hair growth tremendously... Also taken with MSM which was purchased from healthsuperstore,,, I luv it"

Very Good Puchase "This product really works for hair, skin, and nails, combined with proper amount of selenium supplement it is good for cleansing the body, it really is a good product! I use L-cysteine on a daily basis, especially for nail, hair and skin."

relieves hangovers! "I dont know about heavy drinking - but for light drinking I will get NO hangover feeling at all if I take this before bed."

clear up your mind good product

A mom I think it's working.

This is safer to take than N-acetylcysteine (NAC). From Durk Pearson & Sandy Shaw's "Life Extension News" 2007: Why We Choose L-Cysteine Rather Than NAC "N-acetylcysteine (NAC) is a potent nonphysiological (i.e., it is not found naturally in the body) precursor of GSH that increases GSH levels by donating cysteine. The problem with NAC is that, as reported in many papers, it is such a powerful antioxidant that it can inhibit reactive oxygen species (ROS) signaling that is a necessary part of many normal chemical pathways. Hence, we have been very reluctant to use it, at least as an everyday supplement. For example, one recent paper reported that NAC interfered with the ROS (reactive oxygen species) signaling pathway by which erythropoietin stimulates the creation of red blood cells. This was in a study of erythropoietin-induced differentiation of erythroid progenitors derived from mouse fetal liver. Treatment with another potent antioxidant, pyrrolidine dithiocarbamate (PDTC), also caused the attenuation of expression of TER119 (an erythroid-specific antigen). The authors conclude, “The results suggest reactive oxygen species are involved in Epo [erythropoietin]-mediated erythroid differentiation.” In fact, this may have happened to one of us (Sandy), who was taking N-acetylcysteine (but no longer does). Upon having her regular lab tests during her NAC supplementation period, she discovered that her red blood cell levels had declined to half of their previous amount."

Great antioxidant which doesn't interfere with RBC production as NAC might do. NAC, N-Acetyl-Cysteine, is just too potent for some.