#Skin Barrier & Ph

Why showering with hot water destroys the lipid barrier in 7 minutes

I went through a phase a few years ago where I genuinely could not understand why my forearms got itchier the more…

Trans-epidermal water loss: the metric your skin shows you before any product can claim a result

A reader sent me a photo of her cheek next to a moisturiser bottle and asked whether she should switch brands. Her…

pH 5.5 Isn’t Sacred: What the Real Skin pH Range Actually Looks Like

TL;DR: The number 5.5 became gospel because one cosmetic company put it on a bottle in the 1980s. The actual range of…