According to medium.com,
“1. Magnesium Stearate is an awesome ingredient for people who have oily skin because it absorbs oil and helps in keeping the products on skin.
2. It improves adhesion, slip, and texture of the cosmetic products.
3. Magnesium Stearate is especially useful in pressed powders as it is able in to stick to skin as well as it will reduce the glide, slip, and skin feels of your product.”
According to cosmeticsinfo.org,
“The Stearate salts are generally used for their lubricating properties. They also help to keep emulsions from separating into their oil and liquid components. The Stearate salts increase the thickness of the lipid (oil) portion of cosmetics and personal care products and reduce the clear or transparent appearance of finished products.”