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From retinyl palmitate to tretinoin: potency, tolerance, and how to build up without irritation.
17 articles
New active making you break out? It might be purging — or it might be a reaction. The difference matters, because one means the product is working and the other means it needs to go.
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"Sensitive skin" gets used for two different situations that need opposite approaches — a lifelong trait you manage forever, and a temporary reaction you can actually resolve. Confusing the two means either giving up on products unnecessarily or under-treating something genuinely chronic.
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There's a real, physical logic to layering order — but most of the 'never combine these' rules floating around skincare content are stricter than the evidence actually requires.
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Bakuchiol is marketed as a gentler, plant-derived stand-in for retinol. The headline study behind that claim is smaller and more caveated than the marketing suggests — here's what the evidence actually supports.
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Skincare marketing rewards complexity, but the evidence for most benefit sits in three products, done consistently — everything past that is optional, not essential.
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"Hyperpigmentation" gets treated as one problem with one fix. It isn't — melasma, post-inflammatory marks and sun spots have different causes and different treatment ceilings, and mixing them up wastes months of a routine that was never going to work.
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Acne isn't one condition — it's a category. A blackhead, a papule and a cyst share a starting mechanism but need genuinely different treatment, and matching the wrong intensity to the wrong type is where most routines go wrong.
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Panthenol never trends, never headlines a product, and has genuinely good evidence behind it anyway — it just doesn't produce the kind of before-and-after that sells a serum.
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Retinoids and vitamin C get the headlines. Azelaic acid quietly does three jobs at once — acne, rosacea and pigmentation — with a gentler side-effect profile than most of the ingredients that outrank it in popularity.
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Most skincare advice assumes a barrier that works. Eczema-prone skin doesn't have one, which means the usual playbook — layer actives, try new things, optimise your routine — can actively make things worse.
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Stacking retinol, acids and everything else at once tends to end the same way — a barrier that can't tolerate any of them. Recovery is slower than the damage, and rushing it is how people end up back here.
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Slugging isn't the miracle TikTok made it out to be, and it isn't the pore-clogging disaster its critics warn about either — it's ordinary occlusion, with genuine upsides for some skin and real downsides for others.
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Not all retinoids are created equal. The term covers a family of vitamin A derivatives with vastly different potencies, evidence bases, and effects on skin.
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Growth factor serums can cost hundreds of pounds on the promise of cellular regeneration. They're not peptides — they're much larger proteins facing much bigger delivery problems, and the evidence hasn't caught up with the price tag.
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Of all the peptides sold on anti-ageing claims, copper peptides (GHK-Cu) have the strongest research behind them — genuine wound-healing evidence, and cosmetic trial data that's real but more modest than the marketing suggests.
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A serum, a cream and an oil containing the same active aren't the same product wearing different textures — they deliver different amounts, to different depths, on different timelines. The format is doing more work than the ingredient list lets on.
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'Apply thin to thick' is the standard layering advice, but it's really a proxy for something more specific: which ingredients dissolve in water and which dissolve in oil. Understanding solubility explains why routines pill, why some products don't absorb, and how to fix both.
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