Selenocysteine muscle pain ** **A lack of selenium cause muscle pain mechanism of action.** Selenium exerts its biological functions via molecules called selenoproteins which contain the amino acid cysteine with Role of Selenium Dependent Glutathione Peroxidases (Seleno GPxs) in Radio Modulation: Lessons for Radiation Oncology Biological Trace Element Research Springer Nature Link Glutathione Peroxidase: An Antioxidant Enzyme In Health And Disease Liquid Selenium 2 fl oz Global Healing Glutathione Redox Control of Asthma: From Molecular Mechanisms to Therapeutic Opportunities Anne M. Fitzpatrick, Dean P. Jones, Lou Ann S. Brown, 2012