INCI · active · CIR review pending · used in 1 products
Polylysine
Polylysine (CAS #25104-18-1) is a polymer of the amino acid lysine, formally described as poly(imino-(6-amino-1-oxo-2,1-hexanediyl), α-hydro-ω-hydroxy-. It is listed under CosIng with a hair conditioning function, though it appears in cosmetic formulations primarily in acne-targeting products. It is found as an ingredient across a range of serums, toners, and treatment products.
Evidence level
weakEWG score
—Comedogenic
—Category
active● Benefits
Polylysine is associated with anti-acne activity, with at least one study (Leignadier et al., 2023) investigating a lysine-dendrimer approach to rebalancing the microbiota of acne-prone skin. Evidence for its skin benefits is limited to early-stage research.
anti-acne
● Cautions
