Polylysine
What is Polylysine?
Polylysine, or ε-poly-L-lysine, is a cationic homopolymer consisting of repeated L-lysine units linked via peptide bonds. It originates from the bacterial fermentation of Streptomyces albulus, making it a renewable, biodegradable ingredient. Commonly found in skincare serums, creams, masks, and hair treatments, it acts as a multifunctional agent. As a film former, it deposits a sheer, flexible layer on the skin or hair surface, aiding in moisture retention and product performance. This mechanism supports temporary tightening sensations and smoother texture. In hair products, it reduces static and tangles for better comb-through. Its positive charge enables binding to negatively charged surfaces like skin proteins or hair cuticles, enhancing conditioning without greasiness. Derived naturally, it aligns with clean beauty preferences in modern formulations.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Contributes to a lifting sensation via lightweight film on skin.
Supports elasticity improvement through protective surface layer.
Aids moisturizing by helping seal in hydration.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| Individuals interested in anti-aging skincare routines. | Users with rare allergies to lysine-based compounds. |
| People seeking better hair manageability and shine. | Those sensitive to polypeptide preservatives. |
| Those desiring anticellulite firming effects from topical products. | People preferring strictly preservative-free formulations. |
Safety Notes
- Rated low hazard (EWG score 1) with minimal concerns.
- Non-comedogenic (rating 0), unlikely to clog pores.
Frequently Asked Questions about Polylysine
What is polylysine derived from?
It comes from fermenting Streptomyces albulus bacteria, yielding a chain of lysine amino acids.
How does polylysine function in products?
It forms a breathable film to enhance moisture retention, lift, and conditioning on skin or hair.
Is polylysine safe for daily use?
Yes, it carries a low safety rating from evaluators like EWG, suitable for most users.