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GHK and its copper complex are present in human plasma, saliva, and urine at concentrations that decline with age from approximately 200 ng/mL at age 20 to approximately 80 ng/mL by age 60
L-Glutathione vn thng c cc ch em dng b sung qua cc thc phm bo v sc khe, do tc dng chng lo ha v bo v ln da ca n
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Aug 2010;94(3):989-96
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