Home›Explore peptides›Peptide percentages
What percentage of peptide should a serum actually contain?
There is a tested figure for two of the three main cosmetic peptides — 3–5% for Matrixyl 3000, and 10% for Argireline across the studies that exist, positive and negative alike. Copper peptide has no single agreed figure, but typical retail products sit between 1% and 2%.
On this page
In brief
Should you care? Yes — this is one of the few genuinely objective checks you can run on a peptide product before buying it. A product using a small fraction of a tested concentration is not entitled to that trial’s result, however prominently it cites the research.The short version
- Matrixyl 3000: tested at 3%.
- Argireline: tested at 10%; most retail products use less.
- Copper peptide: no single agreed figure; 1–2% is typical, and formulation quality (pH, chelators) matters as much as the percentage.
The tested figures, by peptide
| Peptide | Tested / typical figure | Source of the figure |
|---|---|---|
| Matrixyl 3000 | 3–5% | Independently published wrinkle-depth trials |
| Argireline | 10% across the studies that exist | Mixed — one positive randomised trial, one independent null result. Full picture here |
| Copper peptide (GHK-Cu) | No single agreed figure; 1–2% common in retail products | No dedicated concentration-response trial we could find; the headline collagen trial did not isolate a single "correct" percentage the way the other two do |
Why percentage on its own is not the whole story
A correct percentage is necessary but not sufficient. For copper peptide specifically, formulation pH and the absence of chelating agents matter as much as the raw concentration — a well-formulated 1% can outperform a badly formulated 2%. Percentage is the easiest thing to check, which is exactly why it’s worth checking, but it isn’t the only variable.
What to do when a brand won’t disclose it
Absence of a disclosed percentage is not automatically disqualifying — some brands simply don’t list it — but it removes one of the few objective checks available to you as a buyer. We ask for it as part of our own assessment standard, and we think you should ask the same question of anyone you’re considering buying from, including us.
What you can do next
References
- Concentration figures drawn from the manufacturer and trial data cited on the individual ingredient pages.