You will often see the letter "L" before the name of an amino acid or a protein, such as L-Glutathione
One unique aspect about glutathione is that the body is able to make it in the liver---something that is not true of most antioxidants
doi: 10.3945/ajcn.2010.28674F [PubMed] [Elsevier] 117
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doi: 10.1046/j.1365-2222.2001.01017.x 91 HeSHXieHZhangXJWangXJ
For calcium, try kale, watercress, broccoli, goat/sheep cheese, bok choy, almonds, and okra