How cosmetic products are actually made: emulsification, pH, preservation, and the physics of skin.
HLB values, phase inversion temperatures, and the difference between O/W and W/O emulsions — the fundamentals that anyone evaluating a moisturiser needs to understand before they trust a label.
Parabens are among the most studied and safest preservative systems in cosmetics. The alternatives — phenoxyethanol, benzyl alcohol, essential oils — are not necessarily safer. The 'clean beauty' preservative narrative is based on a 2004 study that has been widely misrepresented.
Vitamin C requires a pH below 3.5 to be effective. AHAs need to be below 4.0. Retinol is most stable above 5.5. Most brands do not disclose their product pH. Here is why that matters — and how to find out.
SPF is measured using 2mg/cm² of product — roughly twice what most people apply. Under real-world application conditions, SPF 50 performs more like SPF 7–8.
Ceramides are expensive raw materials. A formulation with clinically meaningful ceramide concentrations (0.5–2% total ceramide complex) costs significantly more to produce than one with trace amounts.
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