So
Sodium Metabisulfite
Sodium MetabisulfiteAntioxidant
A reducing antioxidant salt used to protect easily-oxidized ingredients from discoloration.
What it does
Sodium metabisulfite is a sulfite salt used as a reducing antioxidant. It helps protect easily-oxidized ingredients — such as certain actives and dyes — from turning brown or losing potency by being oxidized itself first. It is a stability ingredient rather than a skin active.
Browse all 668 ingredients — grouped by what they do, each with whatever evidence we can cite.
This page is public so a shared ingredient card always has its sources behind it — and so you can check them without an account.
Want more like this?
Every evidence-based flag cites its source, Drop tells you when your routine is complete, and it helps you simplify — instead of selling you more. The app launches on iOS and Android in October 2026. Rate my routine works today at /rate — no sign-in.