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In vitro expression of a mouse tissue specific glutathione-peroxidase-like protein lacking the selenocysteine can protect stably transfected mammalian cells against oxidative damage
It is also a naturally-occurring amino acid in animals and fish as well
This is within the standard effective range for most goals
Peptides, including copper peptides like GHK-Cu, are found naturally in the body, but like so many other thingsnamely, collagen and elastinthey decline with age
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