Pseudoalteromonas Ferment Extract

Pseudoalteromonas ferment extracts are used at low levels as skin-conditioning/soothing bioferments (often in the ~0.1–2% range) and are generally well tolerated in clinical use. However, as a complex marine-derived ferment containing multiple biomolecules, it carries a small but real risk of irritation or sensitization in highly reactive or eczema-prone patients (especially when skin barrier is compromised). Given that unpredictability typical of ferments, I rate it as gentle but not “very gentle.” Safety Notes: In commercial skincare, Pseudoalteromonas Ferment Extract is typically supplied as an aqueous/glycolic vendor blend and is often dosed at very low levels (around 0.001–0.05%) in mass-market moisturizers/serums where it appears low on the INCI list, especially in leave-on anti-aging/soothing products. Many supplier technical recommendations and common prestige formulations cluster around ~0.1–1% active blend addition, while a smaller set of high-strength consumer-available serums/ampoules and post-procedure-style barrier products push into the ~2–5% range (generally leave-on; rinse-off products tend to sit at the low end due to contact time and cost). There is no specific FDA/EU concentration cap for this INCI, so the upper end is practically limited by supplier blend composition, stability/viscosity/odor, and cost rather than regulation.