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Retinol.bio is an independent, research-based education site about retinol, retinal and tretinoin. Our goal is simple: explain vitamin A skincare in clear language, grounded in evidence – not marketing.
We focus on what retinoids can realistically do, how to start safely, and when it makes sense to talk to a dermatologist instead of self-experimenting.
Retinol.bio is operated by ronarn AS, an independent digital health and technology company based in Norway. We run a small portfolio of niche health and skincare websites with a focus on:
Retinol.bio does not sell skincare products and is not owned or controlled by any beauty brand.
All educational content is based on ingredient science, dermatology guidelines and published research where available. We always encourage readers to talk to their own doctor or dermatologist for personalised advice.
Retinol.bio is an education-first site. When you are ready to compare actual products, we send you to our separate comparison hub:
Retynol.com – Independent retinol product comparison
Retynol.com focuses on side-by-side comparisons of popular retinol serums and treatments, including price-per-ml, texture, strength and ingredient profiles.
Retinol.bio itself is an information site. Some links from Retinol.bio point to Retynol.com, which in turn uses affiliate links to retailers like Amazon.
If you end up buying a product through those links, ronarn AS may earn a small commission – at no extra cost to you. This helps support the time and research that goes into creating and maintaining our content.
Commissions do not change the educational content on Retinol.bio or the topics we choose to cover.
If you have corrections, questions, or feedback about the content on Retinol.bio, you can contact us at:
Please note: we cannot give individual medical advice. If you are concerned about your skin or medication, speak to your own doctor or dermatologist.