# From expression data to particular outcomes

> Reading list | Advanced Laser Skin Clinic — The Advanced Laser Skin Clinic reading list: GHK gene-expression data, collagen cultures, copper penetration, topical findings and a combination hair trial.

**Reading list**

The broad molecular account and the narrower experiments ask different questions.

## Expression databases

The [review of GHK-Cu and new gene data](https://pmc.ncbi.nlm.nih.gov/articles/PMC6073405/) introduces the breadth of reported GHK expression changes. Its thresholds and gene subsets sharpen my question about specificity.

## Collagen and passage through skin

The [collagen-synthesis paper](https://pubmed.ncbi.nlm.nih.gov/3169264/) concerns human fibroblasts in culture. The [skin-penetration study](https://pmc.ncbi.nlm.nih.gov/articles/PMC3016279/) measures copper in excised human skin. The [review of topically applied GHK](https://pmc.ncbi.nlm.nih.gov/articles/PMC11830136/) brings the delivery problem beside clinical synthesis findings.

## A human combination trial

The [hair-growth trial of 5-aminolevulinic acid and GHK](https://pmc.ncbi.nlm.nih.gov/articles/PMC4969472/) contributes a human hair-count outcome for the complete combination. Its result remains attached to that preparation.

## References

[1] Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data https://pmc.ncbi.nlm.nih.gov/articles/PMC6073405/
[2] Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ https://pubmed.ncbi.nlm.nih.gov/3169264/
[3] Human skin penetration of a copper tripeptide in vitro as a function of skin layer https://pmc.ncbi.nlm.nih.gov/articles/PMC3016279/
[4] Topically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospective https://pmc.ncbi.nlm.nih.gov/articles/PMC11830136/
[5] Efficacy of a Complex of 5-Aminolevulinic Acid and Glycyl-Histidyl-Lysine Peptide on Hair Growth https://pmc.ncbi.nlm.nih.gov/articles/PMC4969472/

---

At Advanced Laser Skin Clinic, I pursue the specifics in published research about GHK and skin; this publication has no treatment business and offers no medical advice.