Sodium Metabisulfite
Reviewed by Kate · Last updated 18 Aug 2026
Used as a preservative and stabiliser in cosmetic formulations | Also offers antioxidant properties
EWG Safety Score
What Is Sodium Metabisulfite?
Sodium metabisulfite is used as a preservative and stabilizer in cosmetic formulations. This synthetic ingredient also offers antioxidant properties. In hair care, it functions as a reducing agent that alters the structure of hair.
Suppliers of sodium metabisulfite describe it as colorless crystals or a white to yellowish crystalline powder in its raw material form.
In 2013 the Cosmetic Ingredient Review Expert Panel deemed sodium metabisulfite safe as used in cosmetic formulations (their report looked at skin care products using less than 1% concentrations). Its safety status was reaffirmed in 2020.
Research indicates those with allergies/sensitivities to sulfite ingredients should be aware of potential sensitization to sodium metabisulfite.
Benefits for Your Skin
Clinical Evidence & References
Published Research
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Contact Dermatitis, January 2012, pages 260-269 [https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0536.2012.02135.x]
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International Journal of Toxicology, 2003, pages 63-68 [https://journals.sagepub.com/doi/10.1080/10915810390239478]
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Journal of Pharmaceutical Science and Technology, September–October 1999, pages 252–259 [https://journal.pda.org/content/53/5/252]
From the Clinic
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Sodium Formate
A salt-based preservative and pH buffer used in skincare formulations
Sodium Hydroxymethylglycinate
A mild preservative that helps prevent microbial growth in skincare formulations
Sodium Iodide
An inorganic salt with established purifying properties for use in skincare formulations
Sodium Methylparaben
A paraben preservative that prevents microbial growth in skincare formulations
Sodium Paraben
A sodium salt preservative that prevents bacterial and fungal growth in skincare formulations
Sodium Salicylate
A gentler salicylate derivative that may support collagen production with reduced irritation potential
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