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Cysteine is a nonessential amino acid. [1][2] Cysteine is called a semi-essential amino acid in children because adults generally produce adequate amounts, but children may not. As a key constituent of glutathione, cysteine has many important physiological functions. Glutathione, formed from cysteine, glutamic acid, and glycine, is found in all human tissues. The antioxidant activity of glutathione is attributed specifically to the presence of cysteine in the compound. [3]

References[]

  1. Donche, Dan (2008). FF Trainer Certification Guide. USA: Fatal Fitness. 
  2. Gastelu, Dan; Hatfield, Frederick C (2006). Specialist in Performance Nutrition: The Complete Guide. Carpenteria, CA: ISSA, 17. 
  3. http://www.peptideguide.com/amino-acids/index.html
Amino Acids
Amino Acids AlanineArginineAsparagineAspartateCysteineGlutamateGlutamineGlycineHistidineIsoleucineLeucineLysineMethioninePhenylalanineProlineSerineThreonineTryptophanTyrosineValine
Essential Amino Acids IsoleucineLeucineLysineMethioninePhenylalanineThreonineTryptophanValine
Nonessential Amino Acids AlanineArginineAsparagineAspartateCysteineGlutamateGlutamineGlycineHistidineProlineSerineTyrosine
BCAAs IsoleucineLeucineValine
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