The ingredient & science library
We educate before we sell. Every entry distinguishes clinical-setting evidence from topical-cosmetic evidence, states the limits, and links to the products it applies to — never the other way round.
Start here
PDRN, explained: what salmon DNA actually does in skincare
What polydeoxyribonucleotide is, how it is thought to work, and an honest read on where the evidence sits — before you buy anything containing it.
Updated 2026-07-04How we grade the evidence (and why 'clinically studied' isn't 'proven')
The tier system behind every claim on this site — injectable vs topical studies, sample sizes, and the difference between mechanism and outcome.
Updated 2026-07-04The ingredient library
Every key ingredient in the catalogue, graded by the same standard. If we stock it, it earns an entry here.
Hyaluronic acid: the water-binding workhorse
A humectant your skin already makes. What molecular weight changes, what it genuinely does for hydration, and its limits.
Updated 2026-07-04Peptides: signals, carriers and marketing
Some peptides have real signalling evidence; plenty are label decoration. How to tell which is which on an INCI list.
Updated 2026-07-04Topical collagen: what it can and cannot do
Collagen molecules are too large to penetrate skin — so why is it in the tub? The honest case for (and against) topical collagen.
Updated 2026-07-04Vitamin C: brightening with a stability problem
Well-evidenced for tone and antioxidant defence — if the formulation keeps it stable. What the derivatives trade away, honestly.
Updated 2026-07-04Read enough? Build the routine.
The routine quiz turns this library into an honest four-question plan — only from products genuinely in stock.