Saccharomyces/Manganese Ferment

Saccharomyces/Manganese Ferment is a yeast-ferment trace mineral complex used at low levels mainly for antioxidant/skin-conditioning benefits, and ferments are generally well-tolerated in most leave-on products. However, fermented extracts can contain biologically active byproducts and residual proteins that occasionally trigger stinging or dermatitis in highly reactive or eczema-prone skin, so I do not consider it “very gentle” across compromised barriers. In real-world routines it is typically a low contributor to irritation, but patch testing is prudent for patients with severe sensitivities. Safety Notes: In commercial skincare, Saccharomyces/Manganese Ferment is typically supplied as a dilute aqueous/glycerin ferment filtrate and is most often used at very low levels in leave-on serums/creams (trace levels around 0.0005–0.05%) as an antioxidant/skin-conditioning support. More prominent “ferment complex” positioning in consumer-available essences and ampoule-style products commonly places it around ~0.1–1%. High-strength consumer products that center on ferments (while still OTC) can reach ~2–5% of the ferment ingredient as-supplied, with higher use levels mainly limited by odor/color, tackiness, and overall formula stability rather than specific regulatory concentration caps.