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Loren Pickart, who discovered GHK-Cu's skincare applications, found no additional benefit from concentrations above 3% and noted that higher concentrations may actually be counterproductive

Medically reviewed by Dr Clair Grainger Last reviewed: 29 Jun 2026 With Superdrug Online Doctor you can message our Doctors for FREE via your patient account

Tirzepatide 10mg vial: Add 2mL BAC water for a 5mg/mL concentration

Jump to: Who should never take weight-loss injections | Conditions that need extra caution | Medications that interact | Pregnancy, breastfeeding and age | If you are scheduled for surgery | When to stop and seek help | Questions to ask your GP | Frequently asked questions | Take home message You shouldnt take weight-loss injections like Wegovy (semaglutide) or Mounjaro (tirzepatide) if you have a personal or family history of medullary thyroid cancer, multiple endocrine neoplasia type 2 (MEN-2), type 1 diabetes, or have had a serious allergic reaction to a GLP-1 medication

Imagine waving goodbye to 15kg if you started at 100kg - that's pretty phenomenal, right

Due to occasional limitations in CT imaging angles, not all nails could be reliably assessed