A woman with long brown hair smiles with her eyes closed as sunlight filters through blinds, casting striped shadows on her face.

The Vitamin D You Can’t Get From a Pill

Most people know that sun exposure produces vitamin D. Fewer people know that vitamin D is only part of what it produces, and that the supplement industry has built an…

A bottle of Esse probiotic serum is surrounded by clear laboratory glassware, highlighting its role in combating the causes of accelerated ageing, with a beaker, petri dish, dropper, and graduated cylinder arranged on a white background.

The Uncomfortable Truth About ‘Probiotic’ Skincare

Most products labelled as probiotic skincare don’t contain live probiotics. They contain postbiotics, which are heat-killed bacteria or fermented extracts that lack the defining characteristic of a true probiotic: life.…