Lithium Magnesium Sodium Silicate

Lithium magnesium sodium silicate is an inert inorganic clay/thickening and suspending agent used at low concentrations (typically <1–5%) to stabilize emulsions and provide slip/viscosity. It is generally non-sensitizing and shows low rates of irritation in cosmetic use, but as a particulate mineral can cause mild mechanical/occlusive irritation in highly compromised or eczematous skin, especially in leave-on products. Given the sensitive-skin safety focus, it fits best as very gentle rather than completely inert. Safety Notes: Lithium Magnesium Sodium Silicate (a synthetic hectorite-type smectite) is used as a rheology modifier/suspending agent in skincare; in many emulsions and serums it appears at low levels (~0.05–0.5%) to stabilize pigments, actives, or oil phases and improve slip. In consumer-available high-structure systems—especially clay/mud masks, paste cleansers, and thick gel-cream textures—total use levels can reach several percent, with observed OTC products/formulation targets commonly in the ~2–8% range for strong yield value and suspension; above this becomes increasingly paste-like and processing-limited. No specific EU/FDA concentration cap is set for this ingredient as used in cosmetics; practical upper limits are driven by aesthetics, stability, and skin feel, with rinse-off masks/cleansers more likely to sit at the high end than leave-on products.