oral glutathione dose as a skin whitening agent: Facts, myths, evidence and controversies How Much is Too Much?
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Kim 2012

doi: 10.3390/antiox10081220

Because it's only four amino acids, Epitalon is structurally simple compared to most research peptides it has no complex folding, no chirality complications, and favorable stability characteristics, which is part of why it's remained a consistent subject of longevity research since the 1980s