The Skin Formulary
Ingredient guides, routine advice, and the science behind skincare — written for curious, discerning readers.
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Sensitive skin doesn't need an empty routine, it needs the right one. The ingredients that genuinely help are barrier-repairing lipids, humectants, and a small group of well-tolerated soothers like niacinamide, ceramides, centella, and azelaic acid. Here is what to look for, what to leave out, and why 'avoid every active' is more cautious than it needs to be.
Recent articles
Sensitive skin calms down faster on a short, well-chosen routine than on an empty one. Here is the gentle morning and evening structure that works, the order things go on, and the slow, careful way to add a single active once the barrier is stable.
Oily skin gets worse when it is treated like an enemy to be conquered. The routines that actually work are the ones that regulate sebum production at the gland — niacinamide, BHA, zinc, and retinol — rather than scrubbing harder. Here is what the evidence says, and the short list of habits to drop.
Bakuchiol is real, gentle, and modestly effective — and it's also one of the most overstated ingredients in skincare. Here's what the split-face research actually shows, where bakuchiol earns its place, and where the marketing has run ahead of the evidence.
Dry skin improves faster than any other type when the routine is right — and worsens faster than any other type when it isn't. Here is the morning and evening structure that works, the order things go on, and the small adjustments that make the difference.
Peptides are real, useful, and over-marketed. Here's what each major family does, what the evidence actually shows, and how to tell a serious peptide product from a bottle of expensive water.
Vitamin C and sunscreen are designed to work together — vitamin C neutralises the free radicals that slip past UV filters, and SPF stops most of the radiation that would otherwise destroy the vitamin C. Here's how to layer them, why the pairing is more effective than either alone, and what most morning routines get wrong.
Dry skin needs three things working together: humectants to draw water in, lipids to repair the barrier, and occlusives to hold the result in place. Here's which ingredients actually do each job, and why the distinction between dry and dehydrated skin changes what to reach for.
Azelaic acid treats acne, fades hyperpigmentation, calms rosacea, and helps with melasma — all without compromising the skin barrier. It's also pregnancy-safe. Here's why it deserves a place in more routines than it currently occupies.
Dark spots are among the most treatable skin concerns — and among the slowest. Here's what actually fades hyperpigmentation, how long to expect it to take, and why your SPF is doing more work than your brightening serum.
The only BHA used in skincare, salicylic acid works inside pores rather than on the surface. Here's what that actually means, who it's for, and how to use it without wrecking your skin barrier.
Some ingredient combinations genuinely don't work well together — and some "rules" you've heard are outdated myths. Here's a clear guide to which pairings to avoid, which to separate, and which are fine despite their reputation.
Niacinamide and salicylic acid are two of the most popular actives for acne-prone skin — and they work remarkably well together. Here's why, how to layer them, and what to watch out for.
Azelaic acid and retinol are two of the most versatile actives in skincare — and they work surprisingly well together. Here's how to combine them safely, who benefits most, and when to be cautious.
The conventional wisdom says never. The evidence says it depends on the form, the timing, and your skin. Here’s what actually matters.
AHAs exfoliate the surface. BHAs clear out pores. Using both sounds like a good idea — and it can be, if you understand the ground rules.
The myth that niacinamide and vitamin C cancel each other out has been circulating for over a decade. The science disagrees — and the answer is more useful than the debate.
Both brands made affordable skincare credible. But they have different philosophies, different strengths, and different ideal customers. Here's an honest comparison based on the formulas.
The internet will tell you they cancel each other out. The science says something more nuanced, and more useful.
From plumping serums to weightless gels, hyaluronic acid is everywhere. But what does molecular weight actually mean for your skin, and how much do you actually need?
Not all acne is the same, and not all acne ingredients work the same way. Here's what the evidence says, and how to build a routine that actually addresses the cause.
L-ascorbic acid vs. ascorbyl glucoside vs. sodium ascorbyl phosphate: the Vitamin C family is vast and confusing. Here's how to decode the labels.
Most people start with too much. Four well-chosen products will do more for your skin than a ten-step routine you don't understand.
Pore-minimising, oil-controlling, barrier-repairing, brightening: niacinamide is one ingredient that genuinely does it all. But is 10% always better than 5%?
The advice online ranges from alarmist to dangerously vague. We went through the safety data for every ingredient in our database so you don't have to.
Tretinoin, retinaldehyde, retinol, retinyl palmitate: the vitamin A spectrum is vast. Understanding the conversion chain changes how you shop for anti-ageing.
Fragrance is the leading cause of cosmetic contact dermatitis. Here's what it actually is, why it's in so many products, and how to avoid it if your skin needs you to.
Mixing actives is where routines go wrong. A simple pH and function framework cuts through the confusion, and it actually works.
Both exfoliate. Both brighten. But glycolic acid and lactic acid work very differently on skin, and choosing the wrong one is one of the most common mistakes in an active routine.
If your skin is persistently dry, reactive, or sensitised, ceramides might be the one ingredient class you are systematically overlooking.