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People who exercise vigorously create oxidative free radicals, which can lead to muscle fatigue and decrease muscle performance suggesting that an antioxidant may be helpful

As fixed effects we added time and treatment-dose effects with interaction

Eaglesfield R, Fernandez-Vizarra E, Lacko E, Caldwell ST, Sloan NL, Siciarz D, et al

One study evaluated 15mg/kg GHK-Cu given three times weekly for 3 months (treatment started in 4-month-old mice and given until 7 months of age)