I have been on Immunocal for two weeks now, since I have started taking it, my energy has great increased. I am currently going through chemo treatments, and it has reversed some of the side effects such as hair loss. I wish I took it before I started the chemo so I could keep my hair. It has also strengthened the skin around my nails that were previously peeling pretty bad. Immunocal contains Cysteine which helps your body to naturally produce the amino acid Glutathione. GSH (Glutathione) helps to oxygenate every cell in your body and it also recycles the oxygen you do have. I cannot get through my day without it.