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While the peptide might clear from the bloodstream relatively quickly, its downstream effects, or the cellular changes it initiates, might persist for longer

The sequence corresponds to amino acids 177191 of native human growth hormone with an N-terminal tyrosine added to improve in vivo stability

B12 supports energy metabolism throughout the day it doesn't need to be timed to your workout like creatine or caffeine

Notably, GHK-Cu levels decline with age : young adults may have around 200 ng/mL in plasma, but levels fall by more than half by age 60

Others consider it for muscle recovery after strain or overuse