Side by side
GHK-Cu vs Thymalin
Both are discussed for anti-aging & longevity. What this site records about each, side by side. Every figure is on the compound's own page with the source it came from.
| GHK-Cu | Thymalin | |
|---|---|---|
| What it is | A naturally occurring copper-binding tripeptide with a long history in topical skincare research. Injected use is not what the research studied. | A thymus extract used as a medicine in Russia for decades. Not a single defined peptide, which is the fact that governs everything else on this page. |
| EvidenceHow much human evidence exists, not how well it works. | Preclinical | Early human trials |
| Regulatory statusReviewed 2026-08-12 | Permitted as a topical cosmetic ingredient in the United States and widely sold as such. Not approved as an injectable medicine, and injectable material is a research chemical with no manufacturing standard behind it. | Registered as a medicine in Russia and several neighbouring states for immune-related indications. Not approved in the United States, the European Union or the United Kingdom, where it is sold only as a research chemical. Because it is an extract rather than a synthesised peptide, purity and composition vary between producers in a way they do not for defined peptides. |
| Routes | Subcutaneous, Topical | Intramuscular, Subcutaneous |
| Half-life | 1 hours | Not recorded |
| Cheapest per mgVials only, read from vendors' own listings and dated on the price index. | $0.28/mg | $1.30/mg |
| Median per mg | $0.60/mg | $4.50/mg |
| Vendors with a price | 63 | 13 |
| Storage once mixed | Refrigerated at 2–8 °C. The solution is characteristically blue; that colour is expected and is not a fault. | Refrigerated at 2–8 °C, and used within days rather than weeks. Biological extracts are less predictable in solution than synthetic peptides. |
Compare two other compounds · The full price index
This page is educational. It describes what published research reports, not what you should do. Peptides discussed here are largely not approved for human use, and nothing on BioAlmanac is medical advice. Nothing here ranks these two against each other. A table can show that one has more human evidence behind it or costs less per milligram; neither of those is a recommendation, and the right comparison for any person is one their doctor makes with them.