What do we know about the new cream study?
A study of a cream containing a bacterial ferment and GHK-Cu enrolled 32 people; 30 completed 56 days. Authors described improvements in measures including skin hydration and some wrinkle ratings. Everyone used the same product, however. It was not compared with the base alone or separate ingredients. [43]
The result therefore concerns the whole mixture and cannot be attributed to GHK-Cu alone. The authors work at a cosmetics company's research centre and declare no external funding. This is important context when assessing the publication. [43]
What did the eyebrow study investigate?
In a study of 18 adults, a GHK-Cu preparation was applied to one eyebrow and the vehicle alone to the other. The sides were allocated randomly. After 12 weeks, there was a small advantage in hair count on the peptide-treated side. No local adverse effects were reported, but a group this small cannot establish overall safety. [44]
The exact result and publication type
In the 1 cm² area assessed, the average hair count on the GHK-Cu side rose from 28.89 to 30.50 after 12 weeks. This was a conference publication from May 2026, and participants were aged 18–40. The result does not concern the treatment of scalp hair loss. [44]
What do these studies not show?
They did not study peptide injections, organ disease or lifespan. Changes in eyebrow appearance and skin hydration measurements are specific cosmetic outcomes. Extending them to whole-body rejuvenation would be a much broader claim than the available data support.
When assessing a cosmetic, look for replication by other teams, comparison with the base alone and longer follow-up. A favourable measurement alone also does not show whether a difference is noticeable or important to users.
How should you read this article?
We describe the cream from the full paper and the eyebrow study from a conference publication. Their quality and limitations differ. For wider context, including an earlier study without an objective advantage, see the separate GHK-Cu profile.
Where does this information come from?
Show sources and how they were checked
- Wang i wsp.: krem z fermentem i GHK-Cu
Study of a multi-ingredient preparation · 10.08.2026 · full text without the separate DOCX supplement · DOI: 10.1111/srt.70360. Accessed: 02.11.2026.
- Bo et al.: topical GHK-Cu and eyebrow density
Conference publication · 22 May 2026 · abstract, methods, results and limitations in the PDF. Accessed: 2 November 2026.