Sodium Magnesium Silicate is a synthetic silicate clay, comprised mainly of magnesium and sodium silicate.
- It is used as a binder and bulking agent in cosmetics and personal care products, in part because of its ability to absorb water (CosmeticsInfo.org). It is also used in the creation of concrete.
- According to a patent filed for a skin-whitening cream, Sodium Magnesium Silicate is effective in slowing the decomposition of formulas, and can “prevent premature darkening of the cosmetic composition and to prevent premature development of a foul odor.” The research done for this patent found that skin-whitening agents susceptible to oxidation have longer shelf lives if those cosmetic compositions also contain Sodium Magnesium Silicate, so it may be considered a preservative in some cases as well.
- Sodium Magnesium Silicate is considered a low hazard ingredient by the Cosmetics Database, and has been found to be non-irritating and not significantly toxic in oral acute or short-term oral or injection toxicity studies (CosmeticsInfo.org). However, because Sodium Magnesium Silicate has large particles, it may be irritating to the eyes.
Source: TruthinAging, https://www.truthinaging.com/ingredients/sodium-magnesium-silicate