Saccharomyces/Rehmannia Glutinosa Root Ferment Extract

Saccharomyces/Rehmannia Glutinosa Root Ferment Extract is a dual-origin ingredient created by fermenting Rehmannia glutinosa root—a plant used traditionally in East Asian skincare—with Saccharomyces, a beneficial yeast. The fermentation process breaks down the plant material into smaller, more bioavailable compounds.This ingredient functions primarily as an antioxidant and emollient, meaning it helps protect skin from oxidative stress whilst also supporting hydration and skin softness. The fermented nature of the extract may enhance its absorption and efficacy compared to the raw plant mate…

The fermentation process breaks down complex plant molecules in Rehmannia root into simpler compounds that skin can more readily absorb. This makes the antioxidants and beneficial constituents more bioavailable than non-fermented versions of the same plant material.Once absorbed, the antioxidants work by neutralising free radicals—unstable molecules that can damage skin cells and contribute to visible ageing. The emollient properties help seal hydration into the skin, creating a conditioning effect.

This ingredient is typically found in serums, essences, and moisturisers at lower concentrations. It works well in layered routines and can be used daily. Because it is generally gentle, it can be combined with most other skincare actives, though as always, introduce new products gradually to assess compatibility with your skin.

This ingredient is generally well-tolerated and considered safe for cosmetic use. Those with yeast sensitivities should exercise caution, though topical exposure differs from ingestion.