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"Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data." International Journal of Molecular Sciences , vol
13:mfaa007
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In studies lasting 68 weeks, participants taking 412mg daily sometimes showed improved endurance, higher time-to-exhaustion scores, or smaller increases in creatine kinase an enzyme that rises with muscle damage.32 Not all trials find performance benefits, but those that do often include participants with lower baseline antioxidant intake or higher training loads.33 For now, researchers interpret the findings as preliminary evidence that astaxanthin may support recovery in situations where oxidative stress is high.38 Sleep and fatigue Researchers have begun exploring how carotenoid intake might relate to sleep quality
Some people begin to notice mild headaches or water retention at this level
Wiederstein M, Sippl MJ
