Your Cart is Empty
What they are, how they work, and why they matter for changing skin through peri and menopause.
You have probably noticed the word peptides appearing in more and more places: on product labels, in skincare articles, in conversations about what to do when your usual routine stops feeling adequate.
But understanding what peptides actually are, and whether they genuinely belong in your routine, requires a bit more than a product description.
This is Part 1 of a three-part series. It covers the science: what peptides are, the six distinct types and what each one does, and why the biological changes of perimenopause and menopause can make peptides specifically relevant to skin at this life stage.
Yes, and more specifically than for almost any other skin type. As oestrogen declines during perimenopause and menopause, fibroblast activity slows, collagen production falls, the skin barrier weakens, and melanocyte regulation becomes unstable.
Peptides address each of these changes through direct cell signalling.
Signal peptides tell fibroblasts to keep producing collagen. Barrier peptides support lipid synthesis and hydration. Brightening peptides regulate pigmentation.
Unlike retinoids, they carry no irritation risk, making daily use achievable for skin that has become sensitive.
The evidence base is strong and the mechanism is direct, not incidental to midlife skin.
What Are Peptides?
Peptides are short chains of amino acids, the same building blocks that make up larger proteins like collagen and elastin in the skin.
The distinction that makes peptides useful in skincare is their size. Full proteins are far too large to penetrate the skin barrier. Certain peptides are small enough to travel through it and reach the dermis, where they act as biological messengers, sending signals to cells that tell them to produce, protect, or regulate.
They are not the same as acids, which work primarily at the surface by accelerating cell turnover.
They are not the same as antioxidants, which work by neutralising free radical damage.
They are not the same as retinoids, which bind to specific receptors and drive cellular renewal.
Peptides communicate directly with the cells responsible for producing the structural proteins that give skin its firmness, elasticity, and integrity.
That distinction matters because it explains why peptides are particularly relevant during hormonal transition, when the production of those structural proteins is declining for reasons that have nothing to do with surface damage and everything to do with a shift in the skin's internal biology.
Peptides are not a single ingredient.
They are a category of ingredients, and different types work through entirely different mechanisms. Understanding which type does what is the foundation of using them intelligently and choosing the right product(s) for your specific priorities.
Signal peptides are the most extensively researched type. They work by mimicking the biological fragments that the body naturally produces during collagen breakdown, signalling to fibroblasts that repair is needed and that new collagen and hyaluronic acid should be produced.
The Matrixyl family, including Palmitoyl Pentapeptide-4 and Palmitoyl Tripeptide-1, are some of the most studied examples, with clinical evidence showing measurable improvements in skin density and wrinkle depth over consistent use.
For skin navigating the collagen loss of menopause, estimated at around 30% in the first five years following the transition, signal peptides address the mechanism directly: they can help to provide the instruction to the skin's receptors that declining oestrogen no longer supplies.
These peptides work by reducing the nerve signals responsible for the repeated muscle micro-contractions that, over time, deepen expression lines.
Argireline, Snap-8, and SYN-AKE are the most commonly used. They are site-specific: effective on dynamic lines such as forehead creases, crow's feet, and frown lines, but not relevant for the structural volume loss or surface texture changes that other peptide types address.
They are often marketed as topical alternatives to injectable neuromodulators - or so-called 'botox in a bottle'.
The analogy is imperfect, since topical application produces subtler and more gradual results, but the mechanism is related.
Carrier peptides do not signal cells directly. Instead, they act as delivery vehicles for trace elements that skin cells need for repair and synthesis.
GHK-Cu (copper peptide), the most researched example, and delivers copper to skin tissue. Copper is a cofactor in collagen and elastin synthesis and in the activity of the antioxidant enzyme superoxide dismutase. GHK-Cu levels in skin decline with age, and restoring them topically has been shown to help support wound healing, reduce inflammation, and improve tissue remodelling.
GHK-Cu has also attracted significant attention in the longevity research space for its broader gene expression effects, making it one of the most scientifically interesting ingredients in cosmetic skincare.
Collagen and elastin in the dermis are continuously being produced and degraded. The enzymes responsible for degradation are called matrix metalloproteinases (MMPs).
As oestrogen declines, MMP activity increases relative to synthesis, meaning the balance tips toward breakdown. Enzyme inhibitor peptides work by blocking MMP activity, effectively protecting the structural proteins that signal peptides are simultaneously working to rebuild.
Used together with signal peptides, they address both sides of the collagen balance: increasing production and reducing degradation at the same time.
Brightening peptides regulate the production and distribution of melanin within the skin. Unlike traditional brightening ingredients such as kojic acid, which typically target a single enzyme (tyrosinase) in the melanin production pathway, advanced brightening peptides intervene at multiple points in the cascade simultaneously.
Tetrapeptide-30, developed by Evonik under the trade name Tego Pep 4, is one of the most clinically evidenced brightening peptides currently available. It has demonstrated efficacy across different skin tones with no irritation, making it particularly well suited to skin that has become sensitised during hormonal transition.
Tego Pep 4 is included in the Beauty by Ané Exfoliating Acid Toner at an active concentration, formulated specifically for the hormonal pigmentation changes that accompany the perimenopause and menopause transition.
Barrier peptides stimulate the synthesis of ceramides and support the integrity of the skin's lipid bilayer. The lipid content of the skin barrier declines as oestrogen levels fall, which is why chronic dehydration is one of the most commonly reported skin concerns during hormonal transition. Barrier peptides address this at a structural level rather than simply adding surface moisture.
Oestrogen has receptor sites in skin tissue and has been actively supporting several key skin functions throughout adult life. When its levels decline, the consequences are specific and measurable.
The result is that each of the six peptide types corresponds directly to one of the specific biological consequences of oestrogen decline. This is not a demographic marketing decision. It is a mechanism-level alignment.
Yes, I believe they can be when the product is well formulated.
The mechanism is directly relevant: signal peptides address declining fibroblast activity; barrier peptides respond to chronic dehydration; brightening peptides target melanocyte instability.
These are not general 'anti-ageing' benefits - they are specific biological responses to skin going through various changes.
The safety profile of peptides makes consistent daily use achievable for skin that can no longer tolerate aggressive actives. They can be a good alternative for someone whose skin doesn't tolerate retinoids well, or for those who are looking for a retinoid alternative.
And as we always say - it is consistent use that delivers results.
Part 2 of this series covers the practical decisions:how peptides compare to retinoids, how topical peptides relate to collagen supplements, whether they work for hair thinning, and how to know whether a product is genuinely worth the price.
Part 3 covers the most frequently asked questions about peptides in skincare, as well as ingestible collagen peptides.
Part 3 of our Estrogen-Depleted Skin Series tackles a frequently asked question: does HRT actually help your skin?
In this piece, I share my own decade-long journey navigating conflicting HRT advice, a hysterectomy with no follow-up care, and the experience of being caught between doctors who disagreed.
I also break down the science: what estrogen was doing in your skin, why women lose approximately 30% of their collagen in the first five years after menopause, what the clinical evidence says about HRT and skin, the truth about topical estrogen face creams (including the unregulated ones you can buy on Amazon), and what to do if HRT is not part of your picture.
