What is the function of magnesium sulfate in cosmetics

          Magnesium sulfate has multiple functions in cosmetics, and its main benefits are as follows:
          one Stable emulsion system
          Magnesium sulfate is commonly used in water in oil (W/O) emulsions, such as liquid foundation, BB cream, CC cream and some sunscreen products. Its mechanism of action is as follows:
          Provide ions to enhance electrostatic repulsion: Magnesium sulfate dissolved in the internal aqueous phase dissociates into Mg ² ⁺ and SO ² ⁻ ions, significantly increasing the ionic strength of the aqueous phase.
          Compressing the double layer and resisting aggregation: These ions can effectively compress the charged layer (double layer) formed by the emulsifier wrapped on the surface of water droplets, strengthen the electrostatic repulsion between water droplets, prevent water droplet aggregation, and maintain the long-term stability of the emulsion.
          Synergistic effect with emulsifiers: Ionic environment can also optimize the performance of certain emulsifiers (especially ionic emulsifiers), making them more effectively anchored at the oil-water interface and reinforcing the protective film.
          two Oil control and pore tightening
          Magnesium sulfate performs well in oil control and skin toning products, especially for skin that is prone to oil and has large pores:
          Instant tightening sensation: Magnesium ions (Mg ² ⁺) act on the surface of the skin, gently causing slight temporary contraction of keratin on the skin surface, bringing an instant tightening sensation.
          Visual pore reduction: The contraction of surface proteins can make the opened pores appear more tight and delicate visually.
          Assist in regulating oil: Although it cannot fundamentally solve the problem of excessive sebum secretion, its astringent effect helps temporarily reduce the oiliness on the surface of the skin, creating a more refreshing and matte texture.

          three Moisturizing and Soothing
          Moisturizing effect: Magnesium sulfate can help the skin lock in moisture, prevent moisture loss, and keep the skin hydrated.
          Soothing effect: For sensitive or irritated skin, magnesium sulfate has a soothing and calming effect, reducing skin discomfort.
          four Cleaning and adjusting pH value
          Cleaning function: Magnesium sulfate helps to clean the dirt and oil in the pores of the skin, making the skin fresher and cleaner.
          Adjust pH value: Maintain the acid-base balance on the skin surface and create a stable environment for the skin.
          five Other functions
          Viscosity adjustment: As an electrolyte, magnesium sulfate can slightly affect the gel structure formed by water-soluble polymers (such as carbomer and xanthan gum), and fine adjust the viscosity of the product.
          Mineral supplement: among body milk, bath salt and foot care products that claim to contain "ocean essence" and "mineral nourishment", magnesium sulfate is an important source of magnesium.
          Process assistance: In some production processes, its salting out effect can be used to assist in the extraction or purification of active ingredients.
          Magnesium sulfate has various effects in cosmetics, such as stabilizing emulsifying systems, controlling oil and astringing pores, moisturizing and soothing, cleaning and adjusting pH values. It is a natural mineral with good safety and mildness, suitable for various types of cosmetics.