Side by side
Comparisons
Editorial comparisons of Korean skincare products and ingredients. To compare specific products yourself, use the comparison tool.
How comparisons work
Each comparison sets out what the options actually do differently, who each one suits and where the published evidence stops. We do not declare a single winner when the honest answer depends on skin type or routine.
What we compare
Mechanism, evidence strength, irritation and barrier risk, routine compatibility, texture and finish, transparency of the ingredient list, and UK availability.
Start here
Read the PDRN ingredient guide or the retinoid guide before choosing between actives.
PDRN vs Salmon Sperm Facial: Topical Skincare vs In-Clinic Polynucleotides
A detailed comparison between topical PDRN skincare and in-clinic salmon DNA treatments, detailing key differences in molecular weight, delivery, and skin hydration benefits.
PDRN vs Retinol: Which Is Better for Your Skin?
A plain-English answer: what retinol and PDRN each do, how strong the evidence is, and whether you can use them together.
How to read a comparison
A comparison is useful when two reasonable options do genuinely different things and the right choice depends on your skin rather than on a ranking. These pages set out the mechanism behind each option, the strength of the evidence for it, the tolerability trade-off and the practical routine consequences. Where the honest conclusion is 'it depends', we say so and explain what it depends on rather than manufacturing a winner.
What each comparison examines
- Mechanism:
- What each option is understood to do in the skin, stated at the level the research supports.
- Evidence strength:
- Whether the support is in vivo human studies, in vitro work, or manufacturer material — and how much weight that deserves.
- Irritation and barrier risk:
- Who typically tolerates each option, and the signs you have introduced it too quickly.
- Routine compatibility:
- What each option should and should not be layered with, and whether it belongs in a morning or evening routine.
- UK availability:
- Whether the products are reliably purchasable in the UK, and where the listing was last checked.
Comparison versus comparison tool
- Editorial comparisons answer category-level questions such as which active to prioritise.
- The comparison tool puts up to four specific products side by side on formulation and routine fit.
- Use the guide first if you have not yet settled on the ingredient category.
To compare specific products yourself, open the comparison tool. For the reasoning behind each verdict, see the review methodology.