Five ingredients worth knowing

We print concentrations on the front of every label because a name without a number is a mood, not a formula. But numbers invite a misconception of their own — that bigger must be better. For most actives there's a window: below it, nothing happens; above it, irritation happens. Here's where the windows sit for the five ingredients we're asked about most.

Niacinamide — the window is 4–10%

Vitamin B3 is skincare's utility player: it moderates oil, supports the barrier, and softens the marks blemishes leave behind. Research support is strongest between four and ten percent. The twenty-percent versions you'll see elsewhere mostly buy you a higher chance of flushing. Clarity Serum sits at eight.

Retinaldehyde — 0.05–0.1% is the working dose

Retinal converts to retinoic acid in one step — retinol takes two — which is why it moves faster at gentler doses. At 0.1% it's a serious, long-term texture-and-lines active. The honest caveats: it takes eight to twelve weeks, it demands morning SPF, and it's off the menu during pregnancy.

Vitamin C — form matters more than number

Pure L-ascorbic acid is the classic, but it's unstable and stings at the fifteen-to-twenty percent doses it needs. We use ethyl ascorbic acid, a stabilized derivative that stays potent in the bottle and works at twelve percent without the sting. If your vitamin C turns orange-brown, it has oxidised — retire it.

Ceramides — a ratio, not a race

Ceramides are the mortar between your skin cells, and topping them up genuinely helps a compromised barrier. But they work in company: skin's own lipid mix is roughly half ceramides, a quarter cholesterol, a quarter fatty acids. A cream that respects that ratio — as Quiet Cream does — outperforms one that simply shouts a bigger ceramide number.

PHA — exfoliation for people who hate exfoliation

Polyhydroxy acids like gluconolactone are the largest, slowest exfoliating molecules — which makes them the gentlest. At four percent, once a week, you get steady surface renewal with almost no sting, even on reactive skin. If glycolic acid has ever sent you pink for a day, start here instead.