Saccharomyces Ferment Lysate Filtrate

Saccharomyces Ferment Lysate Filtrate is a yeast-derived ferment used primarily for barrier support and soothing/hydration, typically at low percentages (often ~0.5–5%) in leave-on products. Clinical experience and patch-testing data generally show low irritation potential, but as a bio-ferment mixture it can occasionally provoke stinging or reactions in highly reactive or eczema-prone patients due to residual metabolites/impurities. In real-world routines (often layered with acids/retinoids), I score it as gentle rather than very gentle to reflect that small but meaningful risk in compromised skin. Safety Notes: In commercial skincare, Saccharomyces Ferment Lysate Filtrate is commonly used as a bio-ferment/skin-conditioning active at low supportive levels (~0.1–1%) in moisturizers, toners, and cleansers (rinse-off formulas often sit toward the low end due to wash-off and cost). Higher-strength consumer-available essences/ampoules and “ferment-focused” serums are frequently positioned with ferment filtrates/lysates as major formula components, and market examples support levels in the ~5–20% range when supplied as diluted trade ingredients intended for direct addition. Above ~20% is uncommon in OTC because many supplier materials are aqueous blends with formulation constraints (preservation, odor/color, and stability), and products typically achieve higher impact by combining multiple ferments rather than pushing a single filtrate higher.