A modern chemical compound developed in the 20th century. Created as the active ingredient in alkaline hair permanent waves and hair removal products to break down hair's disulfide bonds.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
EWG
4
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
1%
0%1%
Reg. Limit
EU regulatory limit: 1%. Source: EU Cosmetics Regulation (EC) 1223/2009, Annex III (Restricted Substances), Entry 24.