What is PDRN?

PDRN stands for Polydeoxyribonucleotide. It's a DNA fragment - a chain of nucleotides derived from DNA - that signals skin cells to repair, renew, and regenerate themselves. Think of it as handing your skin a set of biological instructions: repair, rebuild, and renew.

Originally developed for use in clinical aesthetic medicine - where it was administered via injections - PDRN has now been adapted for topical skincare thanks to advances in low molecular weight formulation. The result? All the cellular renewal power of a clinical treatment, delivered through your daily serum.

What makes INKEY's version stand out is that it's 100% vegan. Traditional PDRN was derived from salmon sperm DNA, which raised ethical and sustainability concerns. INKEY's PDRN Serum uses INJIN Vegan PDRN, sourced from Artemisia capillaris - a resilient, healing plant - with no salmon, no compromise.

The Science Behind PDRN

PDRN works by activating adenosine A2A receptors on the surface of skin cells. This triggers a cascade of biological activity: fibroblasts (the cells responsible for producing collagen, elastin, and other structural proteins) are activated and multiply. The result is a measurable increase in the skin's own collagen and hyaluronic acid levels - not from adding these ingredients on top of the skin, but from stimulating the skin to produce them itself.

For optimal topical penetration, molecular weight matters. INKEY's PDRN Serum uses a low molecular weight formula, developed specifically to allow the ingredient to reach where it needs to work - beneath the skin's surface, where renewal begins.

Types of PDRN in Skincare

Not all PDRN is the same. Here's what you'll find on the market:

Animal-derived PDRN: Traditionally extracted from salmon sperm DNA. Effective, but raises ethical and sustainability concerns for many consumers.

Vegan PDRN (Plant-derived): Extracted from plant sources such as Artemisia capillaris. Clinically proven to match or outperform animal alternatives with a lower irritation profile - and kinder to the planet.

INJIN PDRN: The specific patented vegan PDRN ingredient used in INKEY's formula. Backed by clinical data from the ingredient supplier, and proven to outperform both animal-derived and other vegan alternatives in studies.*

*Based on clinical studies completed using 2% INJIN PDRN (Polydeoxyribonucleotide), ran by the ingredient supplier.

Skin Cell Renewal

PDRN activates your skin's natural regeneration cycle at a cellular level. By stimulating fibroblast proliferation and activating the skin's repair pathways, PDRN encourages the turnover of damaged cells and the production of fresh, healthy ones. The result? Visibly smoother skin texture, reduced appearance of fine lines, and a complexion that looks and feels renewed.

Unlike exfoliating acids that speed up surface cell shedding, PDRN works from within - stimulating biological renewal rather than physical removal. This makes it suitable for daily use without the sensitivity concerns associated with traditional exfoliants.

Boosts Collagen & Hyaluronic Acid

One of PDRN's most powerful properties is its ability to stimulate your skin's own production of collagen and hyaluronic acid - rather than simply applying these ingredients on top of the skin.

Collagen provides the structural scaffold that keeps skin firm, plump, and resilient. Hyaluronic acid keeps skin hydrated and volumised from within. As we age, our natural production of both declines - PDRN helps reverse this trend by giving skin the biological signal it needs to produce more. The effects are cumulative: the longer you use it, the more your skin's own infrastructure improves.

Clinical data using INJIN PDRN at 2% concentration shows a 25–35% increase in collagen synthesis over 8–12 weeks, with hydration levels improving by 45% after just 4 weeks.

Reduces Fine Lines & Wrinkles

By stimulating both collagen and hyaluronic acid production, PDRN helps restore skin volume and smooth surface lines from the inside out. Fine lines caused by dryness, loss of elasticity, and structural decline all become less visible with consistent use.

Unlike retinol - which achieves similar results through a different, more aggressive mechanism - PDRN delivers these anti-ageing benefits without a retinisation period, photosensitivity, or the need for a gradual introduction. It's suitable for use AM and PM from day one.

Suitable for All Skin Types

One of PDRN's great advantages is its compatibility across all skin types:

PDRN is a treatment serum, used as the active step in your routine on both cleansed skin in the morning and evening. Unlike hyaluronic acid, there's no need to apply to damp skin - simply apply after cleansing and before moisturiser.

Step-by-Step Application Guide

Morning Routine:

1. Cleanse with your preferred gentle cleanser
2. Apply one pump of PDRN Serum to face and neck
3. Follow with moisturiser
4. Finish with SPF 30+

Evening Routine:

1. Double cleanse to remove makeup and SPF
2. Apply one pump of PDRN Serum to face and neck
3. Follow with moisturiser or night cream

INKEY Tip: For an extra glow boost, apply Exosome Hydro-Glow Complex Serum first, then layer PDRN Serum on top for maximum renewal and radiance.

Heads Up: When adding new products to your routine, we always recommend patch-testing.

How Much to Use

One pump is enough for face and neck. The formula is concentrated and designed to spread evenly - less is genuinely more. Using more than one pump won't accelerate results, and a single pump ensures you get the most out of every bottle.

Morning vs Evening Use

The beauty of PDRN is that you can use it morning and evening from day one — there's no introduction period, no purging phase, and no photosensitivity to worry about.

PDRN vs Retinol

Both PDRN and retinol are powerful skin renewal ingredients - but they work via very different mechanisms, with very different side effect profiles.

➡ Want the full breakdown? Read our complete PDRN vs Retinol guide →

PDRN vs Hyaluronic Acid

Hyaluronic acid (HA) is a humectant - it draws moisture from the environment and deeper layers of skin to the surface for an instant plumping effect. PDRN takes a fundamentally different approach: it stimulates your skin to produce its own hyaluronic acid - a deeper-acting, longer-lasting approach to hydration and plumping.

Used together, these ingredients are complementary: HA delivers immediate moisture while PDRN builds the skin's capacity to produce and retain hyaluronic acid over time. Think of HA as filling the tank today; PDRN as building a bigger tank for tomorrow.

PDRN vs Exosomes

Both PDRN and exosomes are next-generation cell-communication ingredients working at the frontier of skincare science - but they operate differently. Exosomes are tiny vesicles that carry growth factors and biological signals between cells, triggering repair and renewal. PDRN provides the DNA building blocks that cells need to carry out that repair.

Together, they create a powerful regeneration stack. INKEY Tip: Layer Exosome Hydro-Glow Complex Serum first, then PDRN Serum on top for maximum renewal, glow, and skin-transforming results.

Comparison at a Glance

Can You Use PDRN with Other Actives?

PDRN is highly compatible with most skincare ingredients:

• With Retinol: An excellent pairing - full guide here →. Use PDRN in the AM, retinol in the PM.
• With Vitamin C: Great combination - PDRN renews and rebuilds; Vitamin C brightens and protects.
• With AHAs/BHAs: Apply exfoliating acids first, then PDRN Serum once absorbed.
• With Hyaluronic Acid: Apply HA to damp skin first for immediate moisture; follow with PDRN Serum.
• With Exosome Serum: Apply Exosome Serum first, PDRN on top for amplified renewal and glow.

Concentration Matters

The concentration of PDRN in a formula is one of the most important factors in whether it will deliver real results. It's measured in PPM (parts per million):

Vegan vs Animal-Derived PDRN

Traditional PDRN was derived from salmon sperm DNA. Vegan PDRN uses plant-derived sources - and in the case of INJIN PDRN, clinical studies show it matches or outperforms animal-derived alternatives. Always check the source and certifications. 

Molecular Weight

For topical skincare, low molecular weight PDRN is essential for effective skin penetration. Higher molecular weight fragments sit on the skin's surface without meaningfully reaching the fibroblasts and cellular processes they need to activate. 

Supporting Ingredients to Look For

The best PDRN products combine the active ingredient with complementary supporting ingredients:

• Emollients: Deliver immediate visible glow and smooth texture
• Glycerin: Supports optimal skin hydration
• Antioxidants: Protect skin from environmental damage

Avoid: High-alcohol formulations that disrupt skin pH and counteract the benefits of PDRN; heavy occlusive oils applied before PDRN has absorbed (these can block penetration).

Is PDRN Safe?

Vegan PDRN has a low irritation profile and is well-tolerated across all skin types. 

• Safe for use during pregnancy and breastfeeding
• Suitable for sensitive skin (patch test recommended)
• Free from fragrance
• Safe for use with most prescription skincare - consult your medical professional if unsure

As with any new skincare product, we always recommend patch-testing before incorporating into your full routine.

Potential Side Effects

PDRN is one of the most well-tolerated active ingredients in skincare. However:

• Mild sensitivity may occur if your skin barrier is compromised - introduce gradually if your skin is in a reactive state
• Those using prescription-strength actives (such as tretinoin) should consult their medical professional before introducing new actives
• Post-microneedling: Check with your aesthetician for appropriate pre- and aftercare advice before using PDRN around professional treatments

Who Should Take Extra Care

• Very sensitive or reactive skin - patch test first and introduce one product at a time
• Those on prescription skincare - check with your doctor or dermatologist
• Post-procedure skin - consult your aesthetician or clinician

Application Technique

• Apply to clean, dry skin - no need to apply to damp skin (unlike hyaluronic acid)
• One pump is enough for face and neck — distribute evenly with gentle pressing and patting motions
• Pat gently rather than rubbing to ensure even distribution without disrupting the emollient blend
• Layer thinnest to thickest in your routine

Common Mistakes to Avoid

• Skipping moisturiser: Always follow PDRN Serum with a moisturiser to seal in the benefits and support your skin barrier
• Inconsistent use: PDRN's long-term collagen and HA-boosting benefits are cumulative - consistency is everything
• Applying heavy oils before absorption: Wait for PDRN Serum to fully absorb before layering thicker products on top
• Expecting overnight transformation: The glow is instant - the deeper structural results build over time. Trust the process.

Layering Tips

• Maximum renewal stack: Exosome Hydro-Glow Complex Serum → PDRN Serum → Moisturiser
• Complete anti-ageing routine: PDRN Serum (AM) + Starter Retinol (PM) + Hyaluronic Acid Serum (AM or PM for extra hydration)
• Brightening routine: PDRN Serum + Vitamin C Serum (apply Vitamin C first, then PDRN)

Morning Renewal Routine

1. Gentle Cleanser - prepares skin for optimal absorption
2. PDRN Serum - instant glass glow + cell renewal
3. Moisturiser - seals in benefits, supports barrier
4. SPF 30+ - protects your skin and your results

Evening Renewal Routine

1. Double Cleanse - removes makeup, SPF, and the day's buildup
2. PDRN Serum - overnight cell renewal while your skin repairs
3. Moisturiser or Night Cream - nourishes and seals

Product Combinations That Work

• PDRN + Exosome Hydro-Glow Complex Serum: Next-level regeneration and maximum glow — our ultimate renewal stack. Apply Exosome first, PDRN on top.
• PDRN + Retinol: The complete anti-ageing routine. PDRN in the AM for renewal and glow; Starter Retinol in the PM for cell turnover and collagen. Full guide →
• PDRN + Vitamin C: Renewal and brightening. Apply Vitamin C first, then PDRN on top.
• PDRN + Hyaluronic Acid Serum: Cellular HA stimulation plus immediate surface hydration — for skin that's deeply and durably moisturised.

PDRN isn't just the next skincare trend - it's a clinically proven, DNA-based ingredient that works with your skin's own biology to deliver real, measurable results. From instant glass-skin glow to visibly smoother, bouncier skin in 4 weeks, INKEY's vegan PDRN Serum gives you clinical-strength power at an accessible price.

Made with 100% vegan, plant-derived PDRN sourced from Artemisia capillaris, it outperforms animal-derived alternatives without compromise. Suitable for all skin types. Safe during pregnancy and breastfeeding. Ready to use morning and evening from day one.

Your skin's renewal journey starts now.