Ingredient

Growth Factors

Large signalling proteins sold as the most advanced anti-aging option. Gentle, very expensive, and resting on small studies with open questions.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
Five growth factor serums lined up on white, including MUMUK, DRMTLGY, PEPFACTOR, E.G.F. and Allies of Skin

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Growth factors are the most expensive thing on most skincare shelves, and the hardest to justify. They are large proteins, the skin barrier is built to keep large proteins out, and nobody has shown how much gets through. The studies are small, often uncontrolled, usually funded by the seller, and there is no long-term safety data. They make sense after a procedure, or as a gentle extra if you cannot use retinoids — not ahead of a retinoid and daily sunscreen, and not before a conversation if you have had skin cancer.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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Also calledEGF, epidermal growth factor, TGF-beta, FGF, human growth factor serum, conditioned media
TypeSignalling proteins, sold as cosmetics for aging skin
Strengths soldNot disclosed. There is no standard unit and no way to check potency
UseOnce or twice a day, before moisturizer
Time to workThe published studies ran about 3 to 6 months
Prescription neededNo

What It Is

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Growth factors are proteins the body makes to tell cells what to do — divide, move, build collagen, close a wound. They are the messages behind healing, and skincare uses copies. They are much larger than peptides. A peptide has a handful of amino acids; a growth factor is a folded protein of dozens or hundreds. Labels use abbreviations: EGF for epidermal growth factor, TGF-beta for transforming growth factor beta, plus FGF, VEGF and IGF. Sources vary. Some are made by growing human cells and collecting the fluid they release, listed as conditioned media. Some come from engineered bacteria, yeast or barley. Some products call plant- or snail-derived ingredients growth factors; those are not the human proteins. All of it is sold as a cosmetic. Nothing here is approved as a drug for wrinkles, and if one of these genuinely changed the structure of the skin, that classification would be hard to defend.

How It Works

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In the body a growth factor binds a receptor on a cell and switches on a program inside it. Bind the right receptor on a fibroblast and it makes more collagen. That is how wounds heal.

Skincare claims that applying these proteins sends the same message to aging skin, which has fewer active fibroblasts and makes less collagen. A repair signal is a reasonable thing to want.

The unresolved step is delivery. These are large, water-loving proteins, and the outer layer of skin is a compact oily barrier built to stop exactly that. Manufacturers point to carriers like liposomes, and to older or damaged skin letting more through. Independent measurement of how much reaches the dermis is scarce, and any benefit may come from growth factors acting on the outermost cells — a much smaller claim than the one sold.

Stability is the second problem. Proteins are fragile; heat, light, air and time break them down. That is why these come in airless pumps, and why you cannot tell whether what is in the bottle is still active.

Here is where Growth Factors acts in the skin, and what the others do instead.

About Growth Factors
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Skin basics
BARRIEREPIDERMISDERMISCOLLAGENTELLS THE SKIN TO BUILD COLLAGENHARD TO GET INPROTECTS FROM NEW DAMAGE

Collagen is the framework in the dermis that keeps skin firm. Growth Factors signals the cells that make it, the fibroblasts, to build more. It is slow work — months, not weeks — because the framework is rebuilt from the inside. The idea is sound and the products vary enormously.

Growth factors are proteins, hundreds of times larger than the molecules that cross skin easily. Essentially none of an intact one gets through, which is why they are usually paired with microneedling.

Ultraviolet light and pollution create unstable molecules that damage cell structures and collagen. An antioxidant neutralises them. That is protection against new damage rather than repair of old damage, which is why it belongs alongside sunscreen and not instead of it.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

What It Treats

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No strong evidence for any condition.

Not the Best For

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Wrinkles and Fine Lines

Wrinkles and Fine Lines

Weak evidence

Among the most heavily marketed and most expensive serums in this category, often sold alongside exosomes. Independent human evidence for wrinkle improvement is limited, and most trials are funded by the companies selling them. If the budget is fixed, sunscreen and a retinoid come first.

Forms

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The label tells you less here than anywhere else. What matters is where the proteins came from and how it is packaged.

The original approach
Human cell conditioned media
The fluid collected from cultured human fibroblasts, containing a mixture of growth factors and other proteins. The form behind most of the older studies.
Named and defined
Bioengineered single growth factors
One or a few specific proteins, such as EGF, made in yeast, bacteria or barley. At least you know what is in the bottle.
A different thing
Plant-derived growth factors
Plant proteins and extracts sold under the same word. They are not human growth factors, and their evidence is separate and weaker.
A related claim
Snail secretion filtrate
Sold partly on its growth factor content. Cheap, pleasant, and studied far less than the price gap between categories suggests.
A row of Growth Factors products sold as post-procedure serums, photographed on white.
Provider-supplied
Post-procedure serums
Intended for use after lasers or microneedling, when the barrier is temporarily open. This is where the strongest rationale sits.

Strengths

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No growth factor product states a strength you can compare. There is no standard unit and no way to test potency. What varies is how much of the formula is built around the proteins.

WeakestStrongest
A moisturizer that names a growth factorA dedicated serum in an airless pumpA physician-dispensed or post-procedure serum
Lowest
A moisturizer that names a growth factor
A small addition to a cream already doing its own job. Unlikely to be why it works.
The usual form
A dedicated serum in an airless pump
Built around the proteins and packaged to protect them. What the published studies used.
Highest
A physician-dispensed or post-procedure serum
The most concentrated products, sold through a provider for skin that has just been treated. A setting where a clinician should be involved.

Basics

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When to Apply
On clean skin, before moisturizer and sunscreen, once or twice a day. They do not make skin sensitive to sunlight. Store as the label says and use it within the stated time — these proteins degrade.
How to Start
Daily from the start; no build-up phase. Take a photograph in consistent light first, because the claimed changes are too small for memory to judge.
If It Irritates
Uncommon, and usually a preservative, fragrance or another active rather than the proteins. Persistent redness, itching or bumps mean stop. Cultured-cell products are complex mixtures, so allergy is possible.
If It’s Not Working
Give it three to six months, the length of the published studies. If there is no difference, a retinoid for lines and texture and daily sunscreen for prevention have stronger evidence at a fraction of the cost.

Sample Routine

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Here is where Growth Factors sits in a day, and what goes around it. Pick what you are treating and what your skin is like, and the rest of the routine changes to suit.

What to Expect

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Weeks 1 to 2Weeks 4 to 12After 6 months
Adjusting
Weeks 1 to 2
Nothing to adjust to. Skin looks better hydrated, which is the serum base, not the proteins.
Working
Weeks 4 to 12
Any real change starts here and is gradual. Texture and smoothness first, if anything.
Judge it here
After 6 months
The far end of the published studies. Compare photographs in the same light, not impressions.

What to Avoid

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  • No chemical conflicts The cautions are about how you use growth factors and what you are paying for.
  • Applying them in the same layer as acids or a retinoid. Not a hazard, but low pH is unfriendly to proteins. Give them their own layer.
  • Microneedling a product in at home Home devices push a non-sterile cosmetic through the barrier. These serums are not made to go inside the skin, and doing it yourself invites infection.
  • Leaving the bottle open, warm or in daylight. Proteins degrade. The packaging is part of what you paid for.
  • Buying on the words stem cell Those products contain the same conditioned media, and the phrase adds nothing.
  • Assuming price means strength Nothing on the label is comparable between brands.
  • The folklore growth factors are called cancer-causing about as often as they are called perfectly safe. Neither is established. No harm has been shown from use on the skin, and there is no long-term data, which is why dermatologists advise caution over skin with a history of skin cancer or precancerous change.

If You Stop

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Nothing rebounds. Growth factors do not suppress anything, so stopping does not cause a flare. The hydration and finish from the serum base go within a few days. Whatever slow change it added fades over months as the skin turns over. Given the cost, stopping for a few months and comparing photographs is a fair way to find out whether it did anything.

Ask Your Doctor

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If you have a history of skin cancer or precancerous spots: No harm has been shown, but there is no long-term data. Worth a conversation.
If you are planning to use one after a laser, peel or microneedling: The provider chooses the product and the timing.
If you develop redness, itching or swelling: These are complex protein mixtures and allergy is possible.
If you are pregnant or breastfeeding
Ask the doctor managing your pregnancy first.
If you have eczema, psoriasis or similar
A repair signal on actively inflamed skin has not been studied.
If it is replacing sunscreen or treatment
Using one instead of sunscreen or a prescribed treatment is not supported.

How It Compares

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Retinoids

Better

Decades of independent trials for lines, texture and pigment, at a small fraction of the cost. Growth factors are gentler and far more expensive.

Sunscreen

Different job

The only proven way to prevent the changes growth factors are sold to reverse.

Four peptide serum bottles on white: two droppers, a pink glass bottle and a white pump bottle16:9 hero for Peptides. Never cropped: the tone strip and the corner logo depend on the full frame.

Peptides

Better

Smaller molecules with a better chance of getting in and a similar shortage of independent proof. Much cheaper.

Five blue-toned peptide serum bottles on white, including PD2, COSRX, Seraphime GHK-Cu 2%, The Ordinary and Aifufand16:9 hero for Copper Peptides. Never cropped: the tone strip and the corner logo depend on the full frame.

Copper peptides

Better

Deeper laboratory support, a smaller molecule and a lower price, with the same open question about delivery.

Lasers and microneedling in a clinic

Better

Moderate to strong evidence depending on the device. They reach the dermis directly rather than hoping to. Higher cost per session and some downtime, with results topicals do not match.

Myths

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  • "Growth factors rebuild collagen the way an injectable does." A protein spread on the surface and a treatment delivered into the dermis are different things. The topical evidence is small studies with modest effects.
  • "They are stem cells for your face." These contain the fluid cells were grown in, not living cells. No cosmetic contains working stem cells.
  • "Growth factors cause cancer." Not shown in people using them on the skin. The concern is theoretical, based on what growth factors do inside the body — a reason to ask your dermatologist if you have had skin cancer, not a reason for alarm.
  • "Plant growth factors work like human ones." Different proteins, weaker evidence. The word on the label is doing the work.
  • "The price reflects the science." It does not. The most expensive category in skincare, and one of the least studied independently.
  • "They are safe in pregnancy because they are natural." No skincare product should be described that way. Ask the doctor managing your pregnancy.

Questions Patients Ask

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Do growth factor serums actually work?

Some studies report modest improvement in fine lines and texture over three to six months. Most were small, many uncontrolled, and most funded by the companies selling the product. A weaker foundation than the price suggests.

Can a protein that large get into skin?

That is the central question, and it is not settled. The barrier is built to keep large proteins out. Manufacturers argue that carriers and damaged skin let more through; independent measurement is scarce. Some of any benefit may be at the surface.

Are growth factors safe?

Nothing harmful has been reported from cosmetic use. There is also no long-term data, and because these are signals that tell cells to divide, dermatologists suggest anyone with a history of skin cancer discuss them first.

Are they better than retinol?

Not on the evidence. They are gentler and far more expensive. If you tolerate a retinoid, it is better supported.

Is EGF the same as human growth hormone?

No. Epidermal growth factor is a local signaling protein applied to the skin. Growth hormone acts throughout the body. They share a word, nothing more.

Should I use one after microneedling or a laser?

The best rationale in the category, because the barrier is open for a while. Arrange it with the provider doing the procedure, using a product they supply.

References

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