Ingredients
Niacinamide is the least dramatic active on the shelf, which is why it stayed
It does several small things reasonably well rather than one thing spectacularly. That profile makes it unusually easy to fit into…
Ingredients
What an active actually does, at what strength, and how long it takes.
21 articles · updated August 11, 2026 · page 1 of 2
Ingredients
How to read an INCI list, and where the order stops meaning anything
Ingredients are listed by descending concentration until one per cent, after which the formulator can arrange them freely. That rule explains most label confusion.
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Ingredients
Vitamin C is three different molecules wearing the same name
L-ascorbic acid, its derivatives and the marketing term are not interchangeable. The differences in stability and pH explain why…
Ingredients
Retinoids are a family, and the ladder matters more than the brand
Retinyl esters, retinol, retinaldehyde and prescription forms all end at the same receptor by different numbers of steps. That…
Ingredients
Hyaluronic acid is a sponge, and a sponge needs somewhere to keep the water
It holds a remarkable amount of water for its weight, which is only useful if the water has somewhere to stay. In dry air, an…
Ingredients
AHAs and BHAs differ by solubility, and that decides where they can reach
One family dissolves in water and works across the surface; the other dissolves in oil and can get into a pore. That single…
Ingredients
Why pH decides whether an acid does anything at all
The same percentage of the same acid behaves completely differently at pH three and pH five. Formulators know this, and labels…
Ingredients
Ceramides, cholesterol and fatty acids are the mortar, not a bonus ingredient
The lipid matrix between skin cells has a rough composition, and products that mimic it are doing something structural rather than…
Ingredients
Peptides are messengers, and the marketing runs ahead of the evidence
Short chains of amino acids that signal within skin are a genuinely interesting idea. The gap between that idea and a finished…
Ingredients
Azelaic acid sits awkwardly between the shelf and the prescription pad
The same molecule appears in cosmetic products at one strength and as a prescribed medicine at another. That split tells you a lot…
Ingredients
Benzoyl peroxide bleaches towels for the same reason it works on skin
It releases oxygen, which is both the mechanism and the reason your pillowcase has pale patches. Strength matters less than most…
Ingredients
Squalane is not squalene, and the missing letter is the entire point
One is a natural component of sebum that oxidises readily. The other is its hydrogenated cousin, which is why it sits on a shelf…