Science
Mechanism of Action
This ingredient functions as a targeted reducing agent that breaks the disulfide bonds (-S-S-) within the hair's keratin protein, converting them to cysteine. This reaction compromises the structural stability of the hair shaft, causing it to swell and soften to a jelly-like consistency that can be easily wiped away.
Research
Clinical Evidence
High confidence8%
Key findings
- 01 Clinical testing at an 8.0% concentration demonstrated the successful removal of coarse facial hair within approximately 6 minutes with no visible skin irritation.
- 02 Safety assessments by the SCCS confirm that 5.0% concentrations are effective and safe for non-daily, localized depilatory use.
Transparency
Dusting Analysis
As a functional chemical reactant, this ingredient is rarely 'dusted' because concentrations below 3-5% typically fail to provide sufficient hair-dissolving action, rendering the product's primary claim ineffective.
The Formula
Formulation
Stability
Highly susceptible to oxidation when exposed to heat (above 40°C) and air. Stability requires specialized packaging such as glass or high-density polyethylene (PE); polyolefin plastics must be avoided.
Synergies
- Alkaline agents
- Calcium hydroxide
- Soothing emollients
Conflicts
- Strong acids (produces toxic hydrogen sulfide gas)
- Strong oxidizing agents
- Certain polar natural oils
- Polyolefin packaging
Safety
Safety Profile
Safe for depilatory use at concentrations up to 10% (FDA) or 5% (EU) in non-irritating formulas. Extreme caution must be taken to avoid eye contact, as it can cause permanent corneal scarring.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A high-precision chemical tool for hair removal that is highly effective when formulated within its narrow pH and stability requirements, though it is unsuitable for sensitive skin types.
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References
Sources