Saccharomyces/Magnesium Ferment

Saccharomyces/Magnesium Ferment is a bioferment used mainly as a skin-conditioning/humectant and mineral-delivery component, typically present at low percentages in leave-on products and generally considered well-tolerated. However, ferment-derived mixtures can contain residual proteins/organic acids and variable byproducts that occasionally trigger stinging or flare reactions in highly reactive or eczematous skin, so it is not truly “inert.” Given the overall low but non-zero irritation risk in sensitive populations and routine layering with other actives, a gentle-but-cautious score is appropriate. Safety Notes: In commercial skincare, Saccharomyces/Magnesium Ferment is typically supplied as a dilute ferment filtrate or solution and is most often used at low inclusion levels (~0.05–0.5%) in leave-on serums/creams and some rinse-off cleansers where it functions as a skin-conditioning/mineral/ferment-derived bioactive. Higher-strength consumer products (mainly leave-on essences/ampoules marketed around “ferments/minerals”) can reach ~2–5% active addition, with levels above this uncommon due to raw material solids load, odor/color, and stability/sensory constraints; there is no specific EU/FDA maximum, so the practical upper limit is formulation-driven.