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Guide · Peptide cosmetics
How peptides work in skincare
Peptides appear on the ingredient list of a great many creams and serums. This
guide explains what they actually are, why formulators use them, and what a cosmetic product may and
may not say about them.
What a peptide is
A peptide is a short chain of amino acids. Amino acids are the building blocks of
protein; link a handful of them and you have a peptide, link hundreds and you have a protein.
Collagen, for example, is a protein. The peptides used in cosmetics are much smaller — often
between two and ten amino acids, which is why you will see terms such as dipeptide, tripeptide or
tetrapeptide on an ingredient list.
Size matters for a practical reason: small molecules behave differently in a
formulation than large ones. That is the whole reason peptides became interesting to cosmetic
chemists in the first place.
Why formulators use them
In the trade literature, cosmetic peptides are usually sorted into a few groups.
The names differ between sources, but the grouping is broadly this:
Signal peptides — sequences described as interacting with
processes in the skin’s own matrix.
processes in the skin’s own matrix.
Carrier peptides — sequences that bind trace elements such
as copper and are used to deliver them within a formulation.
as copper and are used to deliver them within a formulation.
Neurotransmitter-inhibiting peptides — the group most
often marketed with comparisons to injectables.
often marketed with comparisons to injectables.
Enzyme-inhibiting peptides — described in relation to the
enzymes that break down matrix proteins.
enzymes that break down matrix proteins.
These are classifications from formulation science, not promises. Which group a
particular peptide belongs to tells you what the formulator had in mind — it does not tell you
what a finished product will do on your face.
What a cosmetic product is allowed to say
This is the part most articles skip, and it is the part that decides how you should
read every peptide claim you encounter. Under EU cosmetics rules, a cosmetic product is defined by
what it does: it cleanses, perfumes, changes appearance, protects, keeps in good condition, or
corrects body odour. It acts on the surface of the body.
A product that claims to change a physiological process inside the body is, by that
definition, no longer a cosmetic. So when a serum is advertised as “rebuilding” tissue or
“regenerating” from within, the wording has left what a cosmetic may claim. A carefully written
product page will describe the ingredient, the formulation and the use — and leave the
promises out.
That is also why our own product pages describe what is in the bottle and how to use
it, and say nothing about what it will do for your skin.
How to read a peptide serum’s label
The INCI list is ordered by quantity down to a concentration of one per cent, after
which the order is free. Three things are worth checking:
How long is the list? A short list is not automatically better,
but it does make a product easier to judge — and easier to identify what you react to, if you
react to something.
but it does make a product easier to judge — and easier to identify what you react to, if you
react to something.
Where does the peptide sit? Peptides are typically used at low
concentrations, so they sit far down the list. That is normal, not a warning sign.
concentrations, so they sit far down the list. That is normal, not a warning sign.
What else is in there? Essential oils are fragrance. A product
can be free from preservatives and parabens and still be scented — the two are different
questions.
can be free from preservatives and parabens and still be scented — the two are different
questions.
A worked example
Our Epitalon
Serum has six ingredients: Pentravan, rose water, tocopherol (vitamin E), rose essential oil,
epitalon and glycerin. Epitalon is an ultra-short peptide and is the cosmetic active here; the rest
is carrier, antioxidant, humectant and fragrance. No preservatives, no parabens, no synthetic
additives — but, because of the rose essential oil, not fragrance-free.
That description tells you what you are buying. Whether it suits your skin is
something only your own use will answer.
Reasonable expectations
Skincare works on the surface, gradually and within limits. A serum is applied to
clean skin before a moisturiser, once or twice a day, and any assessment needs weeks rather than
days. Sun protection remains the single measure with the best-documented effect on how skin ages
— no serum replaces it.
Peptide products in our range
Three examples of how peptides appear in practice — one applied to the skin, two taken by mouth. Each product page lists the full composition.
Facial serum, 50 ml. Six ingredients, with epitalon as the cosmetic active. No preservatives, no parabens — scented with rose essential oil.
from €99
Epitalon Spray Advanced Peptide Bioregulator
A tetrapeptide complex as a 30 ml sublingual spray, manufactured by NANOPEP in Portugal. Taken by mouth, not applied to the skin.
from €89
PAN VILON ultra-short peptide bioregulator VILON®.
Ultra-short peptide bioregulator with VILON® peptides — the smallest sequence in the range.
from €36.50
Frequently asked questions
Are peptides in skincare the same as peptide supplements?
No. A cosmetic peptide is formulated to be applied to the skin and is regulated as a
cosmetic. A peptide food supplement is taken by mouth and is regulated as food. The words overlap,
the product categories do not.
How long should I use a peptide serum before judging it?
Give it four to six weeks of consistent use. Skin renews itself over weeks, and
day-to-day variation — sleep, weather, hydration — is larger than anything you would see
in a few days.
Can I use a peptide serum together with retinol or vitamin C?
Many people layer them, typically serum first on cleansed skin, then the other
product, then a moisturiser. If your skin is sensitive, introduce one new product at a time so you
can tell what causes what.
Does a higher peptide concentration make a product better?
Not by itself. Peptides are used at low concentrations by design, and a formulation
is a system — carrier, pH and stability matter as much as the headline number. A percentage on
the front of a bottle is a marketing decision, not a quality measure.
Is “peptide” a protected or standardised term?
No. It describes a class of molecules, not a quality standard. Two products can both
say “with peptides” and contain entirely different sequences at entirely different concentrations.
The INCI list is where you find out which.
Cosmetic products are intended for cleansing and caring for the skin. This
article is general information about an ingredient class and not advice on treating any condition.
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