Disodium S-Phytyl Diglycoloylcysteine

Disodium S-phytyl diglycoloylcysteine is a synthetic ingredient derived from phytosterols—compounds naturally present in plant oils and seeds. It functions as a skin protectant in cosmetic formulations, helping to maintain the skin's natural defences.This ingredient works at a structural level to support the skin's protective barrier, the outermost layer responsible for retaining moisture and defending against environmental stressors.

The ingredient works by forming a protective layer on the skin's surface, similar to how natural oils and lipids function in the stratum corneum. This layer acts as a barrier, reducing the penetration of irritants and minimising water loss from the skin.By reinforcing the skin's own protective mechanisms, it helps maintain the conditions necessary for healthy skin function and resilience against environmental stressors.

This ingredient is typically found in moisturisers, serums, and barrier-repair products. It works well alongside other hydrating and protective ingredients such as ceramides and hyaluronic acid. For best results, apply to clean, damp skin and follow with a moisturiser to lock in hydration.

Generally well-tolerated in cosmetic formulations. Those with sensitivity to plant-derived ingredients should patch test first, though adverse reactions are uncommon at typical use concentrations.