Exosomes vs PDRN vs Growth Factors: What’s The Difference in Topical Skincare?
Author: Sarah-Jane Corfield-Smith
Published: 24th March 2026
It is easy to feel overwhelmed with skincare ingredients. Exosomes, PDRN, growth factors … They don’t exactly trip off the tongue. And how are you meant to know what they do, which ones to use and how to slot them in with the products you do understand? That’s what we’re here for, and by the time you’ve read this, you will know all there is to know about the individual ingredients, the realistic results to expect and how to use them without overcomplicating your routine or overloading your skin.
It’s important to clarify that all three of these ingredients are often mentioned in the framework of in-clinic treatments. Injectable versions cannot be compared with topical products that contain the ingredient; however, expertly formulated products containing the ingredients will support skin quality and generate genuine change in the skin, and are worthy of your time and attention.
Key Takeaways:
Exosomes, PDRN, and growth factors all support skin regeneration, but they work in different ways - and aren’t interchangeable.
In topical skincare, results depend heavily on formulation and stability.
You don’t need all three - choosing the right ingredient for your skin concern is far more effective than chasing trending ingredients.
Exosomes and growth factors work best for improving firmness and skin ageing, while PDRN supports repair and skin barrier recovery.
What are Exosomes?
Exosomes are naturally produced by all living cells. They are tiny bubble-like structures packed with regenerative molecules.
Mechanism:
Exosomes work by sending signals and messages to other cells. And it’s this cell-to-cell communication that makes them so important as they help support skin regeneration, calm inflammation, and encourage wound healing and cellular repair.
Topical skincare vs treatments:
Not all exosomes are the same. The types used in clinical treatments have a large molecular size, requiring a delivery mechanism to help them penetrate the skin, such as microneedling or fractional laser therapy.
The exosomes used in skincare have to have a smaller molecular size to be able to penetrate the skin without being pushed in by something else.
How they support the skin:
In topical skincare, exosomes are typically derived from plant-based (known as phyto exosomes), or lab-engineered sources and stabilised within formulations. They’re specifically chosen to support hydration, inflammation, and overall skin quality.
What is PDRN in Skincare?
PDRN, (also known as polydeoxyribonucleotide) is a type of polynucleotide, which are fragments of DNA that works to repair the skin at a cellular level. There has been a lot of noise around PDRN, originating from Korea.
Mechanism:
PDRN works by activating the A2A receptors in the skin, which are responsible for accelerating wound healing and collagen production, which is why PDRN is fast becoming the go-to ingredient to heal and soothe skin, especially after treatments such as microneedling.
Topical skincare vs treatments:
The type of polynucleotide used in aesthetic injectable treatments is commonly derived from salmon, as it is highly biocompatible with human skin cells. The salmon DNA undergoes rigorous levels of purification and filtering to make it suitable for clinical use, and the final polynucleotide chain contains no fish protein or allergens.
However, even though there is lots of buzz around PDRN right now, it is an ingredient that has been used in the medical world since the 1990s for wound-healing, thanks to its ability to increase cellular repair.
Increased research and development on using PDRN in topical skincare has now led to the introduction of plant-based PDRN.
How they support the skin:
PDRN helps regenerate skin cells, encourages healing and supports collagen production. It can help strengthen the skin barrier, especially after a wound or irritation.
What are Growth Factors?
Growth factors naturally occur in the skin and are signalling proteins that act as messengers in the skin to activate repair mechanisms.
Mechanism:
They encourage fibroblasts (the cells responsible for producing collagen and elastin) to increase production, helping improve skin firmness and elasticity. They also boost the activity of genes that produce collagen, helping the skin maintain its structure to become firmer and more elastic.
Topical skincare vs treatments:
Just like exosomes and PDRN, growth factors are commonly used in injectable aesthetic treatments. However, when it comes to applying them topically, full-size growth factors are too large to penetrate the skin.
That’s where our next-generation of growth factor, GF MiniProtein™ comes in. It is a more advanced version of traditional growth factors found in skincare (such as TGF, EGF and IGF) which, because of their large molecular size, are unable to penetrate deeply and can only work in the upper layer of the skin.
GF MiniProtein™ is 12 times smaller than traditional growth factors and can penetrate into the skin where it needs to go and activate the skin cells responsible for creating collagen, elastin and hyaluronic acid.
How they support the skin:
Growth factors encourage skin to behave like it did when it was younger. They send signals to the skin to make it produce more collagen and elastin, leading to skin that’s firmer, bouncier and stronger. As these levels increase, the skin can repair damage more effectively, strengthen its barrier, and improve overall texture.
Exosomes vs PDRN vs Growth Factors
Now that we’ve defined each ingredient, here’s how they compare side by side.
Which Should You Choose for Your Skin Concern?
Now you know more about each ingredient, let’s take a look at what works best for different skin concerns.
Barrier damage and irritation
Winner: PDRN
PDRN has the strongest credentials for this issue thanks to its heritage in medical wound healing. It is particularly well-suited to skin that needs structural repair, and it works by supporting the skin's own recovery processes, helping to rebuild a compromised barrier.
However, exosomes would also be a good choice and are particularly good for calming inflammation and regulating the signals that drive redness and sensitivity.
Redness and inflammation
Winner: Exosomes
Exosomes can modulate cellular communication, which means they can help regulate the inflammatory signals that cause persistent redness, not just smooth the surface. This makes them particularly valuable for conditions where the skin is caught in a cycle of reactivity.
However, PDRN is also excellent for supporting tissue recovery where chronic inflammation has caused underlying damage.
Texture and dullness
Winner: Growth factors
This is where growth factors really shine. Their ability to stimulate cell turnover and boost collagen production addresses the underlying reasons skin loses its smoothness and luminosity over time.
Top tip: When paired with complementary actives like retinoids, peptides, and antioxidants, they can amplify visible results.
Advanced sagging
Winner: Growth factors
No matter how well formulated a product is, there is a limit to how much a topical product can do to tighten and lift advanced sagging skin. However, within the boundaries of what skincare can achieve, growth factors are the ingredient to look for as they stimulate collagen and elastin production, both of which are lacking in sagging skin.
Hyperpigmentation and uneven skin tone
Winner: Complementary to other targeted actives
Neither exosomes, PDRN, nor growth factors directly act on hyperpigmentation. However, they complement the ingredients that do target pigmentation, such as vitamin C and retinoids and in some cases minimise any potential irritation they can cause.
Fine lines and ageing
Winner: Exosomes, growth factors, and PDRN
The most effective approach combines all three. Growth factors directly stimulate collagen and elastin production. PDRN supports the skin's repair mechanisms, helping to strengthen and support the skin. Exosomes help the skin's renewal processes more efficiently.
To address ageing from multiple angles simultaneously, it’s best to think of them as a team rather than competitors.
Do They Work in Topical Skincare?
It all depends on the formulation. They can work, but only under the right conditions. Ingredients like exosomes, PDRN, and growth factors are highly complex, and their performance is influenced by how they’re sourced, stabilised, and delivery mechanisms within a product.
In clinical settings, these technologies are often used at higher concentrations and delivered directly into the skin, which is where much of the existing evidence for their role in skin regeneration comes from.
The idea that all topical exosomes are ineffective due to freezing requirements is outdated. Liquid-based, non-stabilised exosomes degrade quickly and require immediate use - which is why they’re used in professional treatments. But modern formulation innovations have made it possible for topical exosomes to remain effective through stabilization technologies.
In topical skincare, they need to be carefully adapted. Shelf life stability, preservation methods, and delivery systems all play a critical role in determining whether the ingredient can remain active and reach the upper layers of the skin to have any effect. This is why formulation matters as much as the ingredient itself. Results are typically more supportive and gradual, rather than comparable to in-clinic treatments.
Exosomes
Are often stabilised using advanced formulation methods to help preserve their structure and maintain activity within a formulation.
Growth factors
Are typically weak when topically derived, unless using the MiniProtein form.
PDRN
Are typically too large to penetrate easily into the skin, with the exception of novel, bio-compatible low molecular weight fragments which ensure penetration and stability.
Can You Use Exosomes, PDRN and Growth Factors Together?
Yes. Exosomes, PDRN, and growth factors are all signalling ingredients that support skin regeneration and repair and work in synergy together. But more isn’t always better, so you might not need all of them all of the time.
They don’t need to be used individually; look for formulations that combine them. Not only will this streamline your routine, but prevent overloading the skin.
If you’re looking to include them in your routine, when introducing any new ingredient, it’s best to start slowly: choose one ingredient for 2 to 4 weeks, allowing your skin to adjust before adding another. This gradual approach ensures stability and reduces the risk of irritation.
And the good news is that if you’re already following our CSA Philosophy® they are easy to incorporate. We always advise to apply products in order of viscosity, starting with the lightest and finishing with the thickest.
Start with a gentle cleanser, then apply an exosome, PDRN or growth factor serum, or a combined product, followed by a vitamin C serum. Finish with a moisturiser and SPF in the morning and a vitamin A in the evening.
By sequencing thoughtfully and avoiding routine overload, you can enjoy the benefits of exosomes, PDRN, and growth factors without compromising skin health.
Exosomes vs PDRN: Is One More Advanced?
It’s wrong to think of one ingredient as more ‘advanced’ than the other. What’s more important is the skin goal you’re aiming for, as one may be more compatible than the other.
Exosomes have generated a lot of excitement in aesthetics because they represent a newer approach to cellular communication, signalling to skin cells in a way that feels cutting-edge. But novelty doesn't equal advancement.
PDRN, by contrast, has a longer track record in regenerative medicine and is well-regarded for its role in supporting the skin's repair processes and that depth of research and clinical history is its own form of advancement.
If you’re looking for an ingredient to help repair and regenerate the skin, PDRN has strong credentials. If you’re aiming for improved skin tone and reducing redness and inflammation, then exosomes have the edge.
Exosomes vs Growth Factors: Are They Interchangeable?
The short answer is no. They are often mentioned together because exosomes can contain growth factors within them.
Growth factors are individual signalling proteins, each with a specific job: stimulating collagen production and supporting cell renewal. They're very precise and focused.
Exosomes’ bubble-like structures contain multiple elements within - growth factors, peptides, genetic material and lipids - and work on a whole host of skin functions such as repair, rejuvenation and regeneration.
Substituting one for the other doesn’t serve a purpose; however, because they are immensely complementary to each other, combining them makes perfect sense.
Medik8’s Science-First Approach
Our GF MiniProteins™ are a prime example. They are bioengineered signalling proteins specifically designed at a smaller molecular size to penetrate the skin more effectively, they remain more stable in formulation, and deliver their signals where the skin can actually use them. Visibly improving the appearance of the skin structure by helping to support collagen, elastin and hyaluronic acid levels, for smoother, firmer-looking skin.
At Medik8, we don't believe in a fad or a trend-led approach to skincare. We pride ourselves on using clinically proven ingredients and harnessing the latest cutting-edge technology to deliver formulations that are stable, consistent, and effective.
Wrinkle reduction serum with 30% multi-peptide complex - proven to deliver results in as little as 10 minutes.¹
30ml / £79
Advanced Pro-Collagen+ Peptide Cream
Rejuvenating Anti-Wrinkle Moisturiser With GF MiniProteinTM & NAD+ Longevity Booster
50ml / £79
The same can be said of our plant-derived phytoexosomes:
Daniel Isaacs
Medik8’s Chief Product Officer
“
Our exosomes comprise a cocktail of natural bioactives encapsulated in a protective bubble, containing signalling molecules like peptides, nutrients, and other bioactives that can exert benefits on the skin. Due to their small size, the plant-sourced system delivers a handful of proteins, lipids and messenger molecules fast and effectively into the skin.
The Bottom Line
Exosomes, PDRN, and growth factors are frequently discussed together because they behave in similar ways. Each of them wants to encourage the skin to do more of what it already does, rather than making it do something different.
There is also a lot of buzz and hype around them. But excitement should come with context. The strongest clinical evidence for all three sits firmly in professional and medical applications, where concentrations, delivery methods, and conditions can be carefully controlled. And this data doesn’t directly correlate to how they behave in topical products.
It can be really easy to find all of this totally overwhelming. But it’s always important to remember that consistent use of well-formulated products will always outperform and deliver over chasing the newest ingredient.
Frequently Asked Questions
Yes! They complement each other really well. PDRN helps repair and regenerate skin cells, while growth factors encourage collagen and elastin production. Using both supports skin healing and improved skin texture.
Absolutely. PDRN can actually balance the potential irritation from retinoids. Vitamin C supports brightening and antioxidant protection, so together they can enhance overall skin renewal and resilience.
No. The exosomes found in Medik8 products have been expertly formulated to penetrate the skin without the need for mechanical intervention.
Growth factors and exosomes both support skin repair, but they work slightly differently. Growth factors are signalling proteins that tell skin cells to produce collagen and regenerate. Exosomes are tiny messenger vesicles that carry growth factors, peptides, and genetic signals between cells for healing and rejuvenation.
Yes. They complement each other well. PDRN focuses on supporting cellular repair and skin regeneration, while exosomes deliver powerful signalling molecules that help cells communicate and renew. Together, they can enhance healing, skin quality and support collagen production.
Yes, they can carry growth factors along with other things like proteins and lipids. And once they’ve carried and delivered them, this helps enhance cell repair and collagen production.