Fed, Not Covered: Why Your Skin Needs What It's Actually Built From
Most routines cover the skin rather than supply it. What skin is structurally built from, why coverage routines fall short, and a three-step minimal routine.
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Formulation, clinical evidence and protocols, from the people who develop them.
Same Serum, Different Results: Why Delivery Determines Whether an Active Performs
Two clients, the same serum, different outcomes. The variable is usually not the active but the delivery system around it. Plus a five-question framework for evaluating...
Why Patients Don't Improve Between Visits — and What Home Care Has to Do With It
When a patient doesn't improve between visits the default assumption is non-compliance. Often the patient is compliant and the product is not delivering. What outcome-oriented home...
What Actually Changes in Your Skin After 50 (and What It Actually Needs)
Skin after 50 is not broken; its needs changed. What actually shifts in the barrier, in collagen synthesis and in turnover, and why more cream is...
A Stable Vitamin C Ester Is Not a Stable Serum
Tetrahexyldecyl ascorbate is sold across medical-grade skincare as the stable form of vitamin C. Under singlet oxygen it degraded completely in six minutes without a co-antioxidant....
Does Niacinamide Increase the Skin's Own Barrier Lipids?
In cultured human keratinocytes, nicotinamide at 1–30 µmol/L raised ceramide biosynthesis 4.1- to 5.5-fold over six days, together with free fatty acids and cholesterol, by upregulating...
Do Vitamin E and Ferulic Acid Actually Stabilise Topical Vitamin C?
Adding ferulic acid to a solution of 15% L-ascorbic acid and 1% alpha-tocopherol improved the chemical stability of both vitamins and doubled photoprotection of human skin,...
Why Isn't a Ceramide Cream Enough? The Lipid Ratio of the Stratum Corneum
Ceramides make up 30-40% of stratum corneum lipids, alongside cholesterol and free fatty acids in an approximate 1:1:1 ratio. But swapping one fatty acid shifts the...
Do Topical Peptides Increase Collagen? What Controlled Trials Show
A 12-week split-face trial (n = 93) found 3 ppm palmitoyl pentapeptide outperformed its own vehicle on fine lines. A 2026 meta-analysis of 19 randomised trials...
Why Must Retinol Convert to Retinoic Acid to Act on Skin?
Retinol does not bind the nuclear receptors: the cell must oxidise it in two steps to retinoic acid. This article sets out the enzymatic route, the...
What Determines Whether a Molecule Penetrates Skin? Molecular Weight and Lipophilicity
Two properties dominate percutaneous absorption: molecular size and lipophilicity. This article sets out what the 500-dalton rule (Bos & Meinardi, 2000) and the Potts–Guy equation actually...
Medical-Grade Skincare: A Glossary of Mechanism Terms
Fourteen terms used across professional skincare, defined so that each definition stands on its own. Includes what “medical-grade” does and does not mean in regulatory terms.