Saccharomyces/Calcium Ferment

Saccharomyces/Calcium Ferment is a yeast-derived ferment used primarily as a skin-conditioning/humectant component, typically included at low concentrations in leave-on products. Clinical experience with similar ferments suggests they are generally well-tolerated, but in highly reactive or eczematous skin there is a small risk of stinging or flare due to complex bio-derived residues and individual sensitivity. Given this low-but-real potential in compromised skin while remaining broadly gentle for most users, a 0.2 score best reflects patient-safety expectations. Safety Notes: In commercial skincare, Saccharomyces/Calcium Ferment is typically used as a bio-ferment/skin-conditioning active at very low levels (around 0.01–0.1%) in multi-ingredient essences, toners, creams, and rinse-off cleansers where it functions mainly as a supportive conditioning component. Higher-strength consumer products marketed around “ferments” (leave-on essences/serums and some sheet mask essences) commonly place it in the ~1–3% range, with a practical top end around ~5% in OTC leave-on formulas due to odor/color, stability, and preservative/bioburden constraints typical of ferment-derived materials.