
Slugging on damaged barrier vs occlusive layering: when each one helps
TL;DR: Slugging works for some damaged barriers and makes others worse. Occlusive layering is the gentler middle path that gets less attention…
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TL;DR: Slugging works for some damaged barriers and makes others worse. Occlusive layering is the gentler middle path that gets less attention…

TL;DR: I have spent eighteen months trying to find a regulatory or chemistry-based definition that distinguishes a serum from an ampoule from…

TL;DR: Probiotic skincare puts live or inactivated bacteria into a cream. Prebiotic skincare puts a sugar that feeds your existing bacteria into…

TL;DR: The yellowy spikes that come off a pore strip are not blackheads. Tanghetti 2014 and Jansen 2018 spelled this out at…

TL;DR: PDRN has reasonable clinical evidence as an injectable for wound healing and tissue repair. The topical PDRN serums that flooded Korean…

TL;DR: The FDA’s current position, last reaffirmed in their Cosmetics Constituent Guidance and the 2022 modernization rules, is that the parabens approved…

TL;DR: If your moisturizer pills, separates, or beads up after an essence layer, the cause is almost always an emulsion-destabilizing interaction at…

TL;DR: Most layering pairs in skincare are folklore. The niacinamide plus retinoid stack is one of the few combinations with published clinical…

TL;DR: Korean fermentation in skincare is a specific manufacturing tradition with measurable downstream effects on ingredient profile. Western brands have started using…

TL;DR: The standard pigmentation protocol was developed on Fitzpatrick II-III skin and routinely fails on V-VI. The active that works for a…