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Safety notes: Contraindicated in individuals with a personal history of cancer, uncontrolled diabetes, significant cardiovascular disease, or untreated sleep apnea
Problem: Dullness or Sallow Appearance Some researchers report that GHK-CU initially makes skin look tired or sallow before radiance emerges
doi:10.1016/j.freeradbiomed.2009.09.017
Once mixed, the solution is stable at 28C for 28 days, but every needle puncture introduces contamination risk, so using a vial within 21 days and minimizing punctures (one draw per dose, never re-injecting air) extends usable life
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