Science
Mechanism of Action
As a serine protease, Trypsin precisely breaks down proteins into smaller peptides and amino acids by hydrolyzing peptide bonds, specifically targeting the carboxyl side of lysine and arginine residues. On the skin, this enzymatic action promotes the gentle removal of dead skin cells, leading to a smoother, brighter, and more even-toned complexion. Furthermore, it can improve the skin's permeability, potentially increasing the absorption of other co-applied skincare ingredients.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
Given its 'high' irritancy rating and the noted lack of sufficient scientific information to determine appropriate doses for general cosmetic use, trypsin's concentrations in products may vary without clear safety or efficacy guidelines. The observed epidermal hyperproliferation and inflammation in animal studies at certain topical doses highlight the critical need for precise concentration control.
The Formula
Formulation
Stability
Trypsin aqueous solutions exhibit optimal activity within a pH range of 7.0-9.0 and at approximately 37°C. While active at neutral to alkaline pH, its aqueous solutions are considerably stable at highly acidic pH (2-3) but unstable around pH 6. To prevent autolysis and preserve enzyme efficacy, trypsin should be stored at very cold temperatures (-20 to -80°C). Storage at pH 3 can also impede autolysis, with activity being restored upon pH adjustment to approximately 8. High temperatures can inactivate the enzyme.
Synergies
- Ingredients intended for enhanced transdermal absorption
Conflicts
- High temperatures (risk of inactivation/loss of efficacy)
- pH conditions outside optimal ranges for activity (pH 7-9) or stability (pH 2-3 for aqueous solutions)
- Protease inhibitors
Safety
Safety Profile
Trypsin has not been reviewed by the CIR for cosmetic use. It carries a 'high' irritancy potential, with some individuals, particularly those with sensitive skin or a history of allergic reactions, potentially experiencing irritation, redness, or itching. While used medically for wound cleaning, it can cause localized side effects such as pain and burning. Insufficient scientific information exists to establish a generally appropriate dose range for its widespread cosmetic application.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its potential as an enzymatic exfoliant and an enhancer for ingredient absorption, trypsin's 'high' irritancy risk, unreviewed CIR status, and lack of clear safe dosage information, coupled with animal study findings of potential hyperproliferation and inflammation, make its general cosmetic application questionable.
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