Potassium Sulfite

INCI: POTASSIUM SULFITE

CAS Number
10117-38-1
Function
Antioxidant, hair waving/straightening, preservative, reducing agent
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status restricted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Sulfiting agents are FDA-regulated; GRAS in food up to limits; permitted in cosmetics with labeling

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
moderate
Sensitization
high

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Known allergen class. Must comply with EU concentration limits. Mandatory labeling for sulfite-containing products. Contraindicated for sulfite-sensitive consumers. Monitor residual SO2 levels in finished product.

โš ๏ธ
Concern Level: High

Regulatory Flags

potential-allergen preservative fda_food_additive

Frequently Asked Questions

Is Potassium Sulfite safe in cosmetics?

Known allergen class. Must comply with EU concentration limits. Mandatory labeling for sulfite-containing products. Contraindicated for sulfite-sensitive consumers. Monitor residual SO2 levels in finished product. The EU classifies Potassium Sulfite as "restricted". Safety rating: MODERATE.

Is Potassium Sulfite allowed in the EU?

Potassium Sulfite EU regulatory status: restricted. This is based on EU Regulation 1223/2009 and its amendments.

What does Potassium Sulfite do in cosmetics?

Potassium Sulfite functions as: Antioxidant, hair waving/straightening, preservative, reducing agent. It is classified as a cosmetic ingredient in our database. CAS number: 10117-38-1.

What is the Margin of Safety for Potassium Sulfite?

adequate The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

๐Ÿ“ฑ

Is Potassium Sulfite in Your Products?

Scan any product label with Piro โ€” our free ingredient scanner. Point your camera at the ingredients list and get instant safety scores for every ingredient.

Try Piro Free โ†’

Analyze Your Full Ingredient List

Paste any INCI list into the Decoder for instant safety analysis, or calculate the Margin of Safety for Potassium Sulfite in your formulation.