Want your skin to look how you feel?

GHK-Cu has decades of topical cosmetic data and no human trials by injection. The Peptide Checkup usually lands on the GHK-Cu pen for firmness and texture, Glow where surface remodelling is the interest, or Klow where slow-healing marks, scars or irritation are part of it — and tells you which kind of evidence you are relying on.

Start the 7-minute Checkup See the three pens

01 — Where the Checkup usually lands

3 pens are researched for skin & cosmetic.

The controlled GHK-Cu studies are topical. An injectable pen is supplied for research use and graded on that basis; neither blend has been studied in people as a combination. Your answers decide — including whether to buy at all.

02 — What the Checkup checks

Four things it checks for skin & cosmetic.

7 minutes of structured questions — categories, not essays — run through a deterministic rules engine against the evidence and regulatory database, then scored against the range.

01Whether your goal is firmness and texture (GHK-Cu), skin plus remodelling (Glow) or skin plus repair and inflammation (Klow)
02The difference between a cosmetic ingredient and an unlicensed injectable in your country
03Skin conditions, melanoma history and medicines that change the picture
04Better-evidenced options a dermatologist is likely to raise first

Research-use pens

Sold for research use only. Not a medicine and not authorised for human consumption. Purchasers must be 18+ and confirm intended use at checkout.

Peptide Checkup

The Peptide Checkup provides educational information and a structured summary of published research and regulatory status. It is not medical advice, does not diagnose or treat any condition, and does not replace a consultation with a qualified healthcare professional.

Skin & cosmetic

Take the 7-minute Checkup for skin & cosmetic.

Start the Checkup How it works

Not medical advice · Research-use labelling applies · 18+ only · It can say no

≈7 min

Start the Checkup