# Topical skin results

> Skin results, closely read | Alliance Aesthetics — Alliance Aesthetics examines reported topical GHK-Cu results, including what the collagen-response percentages actually describe.

**Copper peptide essays**

A percentage looks decisive until the question changes from how large it is to what it counts.

## The collagen-response percentages

The [anti-wrinkle review reports increased procollagen synthesis in 70% of GHK-Cu-treated subjects, versus 50% for vitamin C and 40% for retinoic acid](https://pmc.ncbi.nlm.nih.gov/articles/PMC11830136/). Procollagen synthesis is the production measure being discussed. The percentages describe the subjects in whom that measure increased.

That wording carries the whole interpretation. A response in 70% of subjects says something different from a 70% increase in collagen, and neither statement supplies a percentage reduction in wrinkles. This response needs no embellishment to interest me; a new endpoint cannot be substituted merely because a larger-looking claim is easier to remember.

The illustration separates the reported proportions from the tempting interpretation. It reproduces the review's figures without converting them into a measure of wrinkle reduction.

![Three horizontal bars showing reported procollagen responses of 70%, 50% and 40%](images/procollagen-response.svg)

*Subjects with increased procollagen synthesis as reported in the [anti-wrinkle review](https://pmc.ncbi.nlm.nih.gov/articles/PMC11830136/); these percentages describe responders, not the amount of collagen gained.*

## The wider topical account

The [skin-regeneration review describes placebo-controlled improvements in laxity, clarity, fine lines, wrinkle depth and density](https://pmc.ncbi.nlm.nih.gov/articles/PMC4508379/). This is the part of the record that speaks to appearance and skin characteristics. It deserves attention on those terms, with the additional reminder that a review gathers findings from the studies it discusses.

Specific measured outcomes do more to persuade me than the size of the surrounding vocabulary. “Regeneration” can take in a great deal. A named outcome makes it possible to ask what improved and under which conditions. The [newer anti-wrinkle review also makes the delivery problem central to its assessment](https://pmc.ncbi.nlm.nih.gov/articles/PMC11830136/), so the preparation remains relevant even when the discussion reaches cosmetic results.

## The comparison I would commission

An experiment with my preferred cast would include a clearly described topical preparation, a comparison separating its companions' contributions, and outcomes traceable from the start of the study to its conclusion. That is a wish for a sharper experiment, not a treatment recommendation.

The topical record has earned a place on my research shelf. It does not settle how much credit belongs to the copper-peptide complex in every possible formulation. The [barrier experiment](/skin-barrier) explains why I give delivery such a prominent place; the [hair trial](/hair-complex) offers an even more direct example of ingredients sharing a result.

---

At Alliance Aesthetics I put copper-peptide partnerships through their paces against published research; this editorial site is not a business and supplies no medical advice.