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Male SD rats were administered a single IM injection of blank solvent (excipient), and biological samples, including whole blood, plasma, urine, feces, and tissues, were collected for background control

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Variables include: Age and baseline GHK levels Diet and overall nutrition Sleep quality and quantity Sun exposure and skin care habits Genetic factors affecting copper metabolism Concurrent health conditions Researchers who optimize supporting factors (sleep, nutrition, sun protection) typically report better outcomes than those relying solely on peptide administration

6 weeks: 2 mL used