Polyhydroxystearic acid is a chemical compound often used in cosmetics and personal care products, particularly in sunscreens. It serves as an emulsifier, stabilizer, and thickening agent in these products. Here's some more information about polyhydroxystearic acid:

Chemical Structure: Polyhydroxystearic acid is a fatty acid derived from stearic acid. It contains multiple hydroxyl (OH) groups along its hydrocarbon chain, which gives it its name.

Function: In cosmetics and sunscreens, polyhydroxystearic acid is primarily used as a dispersing agent. It helps evenly distribute pigments and other ingredients in the product, ensuring that it stays well-mixed and doesn't separate over time. This is particularly important in sunscreens, where even distribution of UV-blocking agents is crucial for effective sun protection.

Stabilizer: Polyhydroxystearic acid also acts as a stabilizer, helping to prevent the ingredients in a product from reacting with each other or breaking down when exposed to light, heat, or air.

Thickening Agent: It can function as a thickening agent in some cosmetic formulations, giving the product a desirable texture.

Sunscreen Applications: In sunscreens, polyhydroxystearic acid is often used in combination with other sunscreen actives, such as zinc oxide or titanium dioxide. These ingredients can be challenging to disperse evenly in a formula due to their mineral nature, so polyhydroxystearic acid helps maintain the stability and uniformity of the sunscreen.

Skin-Friendly: Polyhydroxystearic acid is generally considered safe for use in cosmetics and skincare products. It is often chosen for its compatibility with a wide range of skin types and its low potential for skin irritation.

Regulation: The use of polyhydroxystearic acid, like other cosmetic ingredients, is regulated by various government agencies, such as the U.S. Food and Drug Administration (FDA) and the European Commission. These agencies set guidelines and restrictions on its use in cosmetics to ensure consumer safety.

Other Uses: Apart from cosmetics, polyhydroxystearic acid can also find applications in the food industry as a food additive and in the pharmaceutical industry for drug formulations.

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