Is PDRN Safe? Side Effects, Allergies and Who Should Avoid It

Short answer: For most adults, yes. PDRN has a strong safety record as a medicine, and topical PDRN products rarely cause problems beyond reactions to other ingredients. Take extra care if you have a fish allergy, are pregnant or breastfeeding, or are considering injections, where the practitioner and product matter most.

Is PDRN safe to put on your face? When an ingredient is marketed as "salmon DNA", it is a reasonable question. The good news is that PDRN has a longer safety history than most trending skincare ingredients, because it started life as a medicine. This guide explains what that history shows, the side effects to expect, and where caution is still sensible. For the benefits side of the story, see is PDRN good for skin.

Key takeaways

• Medical PDRN has trial and post-marketing safety data, including a five-year surveillance study of more than 300,000 prescriptions[1].

• Topical PDRN is low risk for most people. Reactions are more often due to fragrance or other ingredients.

• Injections are generally well tolerated in studies, with mostly mild, short-lived side effects[3,4].

• Avoid or seek advice first if you have a fish allergy, are pregnant or breastfeeding, or have very reactive skin.

The evidence behind PDRN's safety record

PDRN was developed as a medicine before it became a cosmetic, which gives us safety information you rarely get for a new skincare ingredient[1]:

• In a randomised trial of 216 people with diabetic foot ulcers treated for up to eight weeks, safety and tolerability were reported as excellent[2].

• Animal toxicity studies found no toxic effects on major organs at the doses tested[1].

• Five years of post-marketing surveillance, covering more than 300,000 prescriptions, confirmed a good safety profile[1].

Part of the reason is how it is made. Pharmaceutical PDRN is purified at high temperature, giving a product more than 95% pure with proteins and peptides inactivated, which lowers the risk of immune reactions[1]. The body then breaks it down with the same enzymes it uses for its own DNA.

Is topical PDRN safe?

PDRN serums, creams, toners and masks are cosmetics. In the UK, a cosmetic must have a safety assessment before it is sold, and a Responsible Person based in the UK must hold its safety information[5,6]. For most people these products are low risk because:

• PDRN is a large molecule, so little of it passes deep into intact skin[10].

• It does not exfoliate, sensitise skin to sunlight or speed up cell turnover the way retinoids and acids do.

• Reactions, when they happen, are more often linked to fragrance, essential oils or preservatives.

There is no long-term safety data specific to daily topical PDRN use, so the reassurance comes mainly from its medical history and the low expected absorption. Possible side effects with any new skincare product include mild stinging, redness, itching or small bumps. If they happen, stop using the product. If you are worried about breakouts specifically, read will PDRN cause acne.

Is injected PDRN safe?

In studies, PDRN and polynucleotide injections are generally well tolerated. A 2026 systematic review of seven randomised trials found no serious treatment-related adverse events, with local reactions mostly mild and short-lived, but noted that small samples and short follow-up limit the conclusions[4].

Expected effects include pain, swelling, redness, bruising and small bumps at the injection points, which usually settle within a few days. Rarer risks include infection, allergic reaction and longer-lasting lumps. Safety depends heavily on who performs the treatment and which product they use, which we cover in are PDRN injections safe.

PDRN safety at a glance

Who should avoid PDRN or get advice first?

• Fish or seafood allergy. Purification removes most proteins[1], but salmon PDRN is still a fish product, and injectable salmon DNA products list fish allergy as a contraindication[7]. For topical use, speak to a pharmacist or GP first, or choose a plant-based PDRN. See is PDRN vegan for alternatives.

• Pregnancy and breastfeeding. PDRN has not been studied here. See is PDRN safe in pregnancy.

• Broken or infected skin. Wait until it has healed, unless a clinician advises otherwise.

• Autoimmune conditions, bleeding disorders or blood thinners. These matter mostly for injections. Tell your practitioner about every condition and medicine.

• Eczema, rosacea or very reactive skin. Patch test first and choose fragrance-free formulas.

Pharmacist’s tip: A fish allergy is about proteins, and purified PDRN contains very little protein. But "very little" is not "none", and cosmetic-grade PDRN is not always purified to pharmaceutical standards. If your allergy is severe, choose a plant PDRN rather than taking the chance.

How to patch test a PDRN product

• Apply a small amount to the inside of your forearm or behind your ear.

• Repeat once or twice daily for three to five days.

• If there is no redness, itching or swelling, try a small area of your face, such as along the jawline.

• If you react at any stage, stop and rinse the area with water.

Safety red flags with PDRN products

• Grey-market imports and counterfeits. Cosmetics sold in Great Britain need a UK Responsible Person[6]. Products shipped directly from overseas sellers may not meet this, and fakes of popular Korean brands circulate. Buy from reputable retailers.

• Using serums for microneedling. Cosmetic serums are not sterile. Using them with dermarollers, microneedling pens or "injector" devices at home risks infection and persistent lumps.

• Unregistered injectors. Choose a registered healthcare professional who can tell you the exact product name and batch.

• Over-the-top claims. No topical product can do what an injection does. Be wary of anything claiming to "repair DNA".

What to do if you react to PDRN

For a mild reaction to a cosmetic, stop the product, rinse with lukewarm water and use a plain, fragrance-free moisturiser. Speak to a pharmacist if it does not settle within a few days. Seek urgent medical help for swelling of the face, lips or tongue, difficulty breathing or a widespread rash.

Report a reaction to a cosmetic to the brand or retailer. Serious reactions can be reported through Trading Standards (via the Citizens Advice consumer helpline), and these reports reach the Office for Product Safety and Standards[9]. For problems after an injection, contact your practitioner and report it through the MHRA Yellow Card scheme, which covers medicines and medical devices[8].

The bottom line

PDRN is one of the better-studied trending ingredients when it comes to safety, thanks to its history as a medicine. Topical products are low risk for most people. The real safety issues are fish allergy, pregnancy, poor-quality imports and injections done badly. Choose reputable products and qualified practitioners, patch test, and you will avoid most problems.

FAQs

Can PDRN cause an allergic reaction?

It is uncommon but possible, particularly in people with fish allergies or very reactive skin. Reactions to fragrance or preservatives in the same product are more common.

Is PDRN safe for sensitive skin?

Often, yes. PDRN is non-exfoliating and frequently used in products for sensitive skin. Choose fragrance-free formulas and patch test.

Is it safe to use PDRN with retinol or vitamin C?

Yes. PDRN has no known interactions with common actives. Introduce one new product at a time so you can tell what your skin is reacting to. See is PDRN retinol.

Does PDRN change your DNA?

No. PDRN fragments are broken down into building blocks by enzymes[1]. They do not alter your genes.

Is PDRN safe for teenagers?

Topical PDRN is generally low risk at any age, but teenagers with acne are better served by proven acne treatments. Some injectable products are not for use under 18.

Related reading

• Are PDRN Injections Safe? Side Effects and UK Rules

• Is PDRN Safe in Pregnancy? A Pharmacist's Honest Answer

• Will PDRN Cause Acne? Why You Might Break Out and What to Do

• Is PDRN Good for Skin? What the Evidence Really Shows

References

• Squadrito F, Bitto A, Irrera N, et al. Pharmacological activity and clinical use of PDRN. Frontiers in Pharmacology. 2017;8:224.

• Squadrito F, Bitto A, Altavilla D, et al. The effect of PDRN, an adenosine receptor A2A agonist, on the healing of chronic diabetic foot ulcers: results of a clinical trial. J Clin Endocrinol Metab. 2014;99(5):E746–E753.

• The effectiveness of polynucleotides in esthetic medicine: a systematic review. J Cosmet Dermatol. 2025;24(2):e16721.

• Alhussain AM, et al. Polynucleotides and polydeoxyribonucleotides for skin rejuvenation, postoperative scar prevention, and wound healing: a systematic review of randomized clinical trials. Cureus. 2026;18(7).

• Regulation (EC) No 1223/2009 on cosmetic products, as retained in UK law (UK Cosmetics Regulation). legislation.gov.uk, 2009.

• The Product Safety and Metrology etc. (Amendment etc.) (EU Exit) Regulations 2019, Schedule 34 (UK Responsible Person). legislation.gov.uk, 2019.

• Rejuran S (polynucleotide injectable) product listing including contraindications. Consentz product directory, accessed October 2026.

• MHRA. Yellow Card scheme. Accessed October 2026.

• Office for Product Safety and Standards. SUE and safeguarding notifications for cosmetics. GOV.UK, accessed October 2026.

• Park SJ, et al. Plasma-engineered PDRN: surface charge neutralization and nanosizing enhance uptake and regeneration potential. Pharmaceutics. 2025;17(9):1136.

This article is for general information only and is not a substitute for personalised advice from a pharmacist, GP or other qualified healthcare professional. If you have a reaction or a medical concern, seek professional advice.