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The rationale for cycling includes allowing receptor resensitization and providing observation periods to assess maintained benefits
Sleep disturbance: If injecting late in the day, the energy boost may interfere with sleep
GHK-Cu (Copper Tripeptide-1) is legally used as a topical cosmetic ingredient in the UK, but injectable or systemic use is unlicensed and constitutes an unregulated medicinal use
Weight of evidence: Overall evidence is LowModerate in VPA models
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