Propylene glycol is a commonly used ingredient in various products, including cosmetics, vapes, and food products. It is a clear, odorless liquid that serves as a humectant, solvent, and preservative. This synthetic compound is derived from petroleum and has a variety of uses in different industries.

Propylene glycol is a popular ingredient in cosmetic products due to its ability to act as a humectant. Humectants are ingredients that help retain moisture in the skin. This makes propylene glycol an ideal ingredient for moisturizing lotions, creams, and other skincare products. It is also used as a solvent in cosmetics to help other ingredients dissolve and mix more easily, creating a stable and effective formula.

Another advantage of using propylene glycol in cosmetic products is that it can act as a preservative, helping to extend the shelf life of products by preventing the growth of bacteria and fungi. This makes it a valuable ingredient in products likely to be exposed to air, such as lotions, creams, and serums.

The Cosmetic Ingredient Review Expert Panel has evaluated the safety of propylene glycol and determined that it is generally safe for use in concentrations up to 50%. This means that it can be used in cosmetic formulations at a concentration of up to 50% without causing any harm to the user. However, it is essential to note that some people with sensitive skin may experience irritation or allergic reactions to this ingredient. Therefore, patch-test products containing propylene glycol before using them all over the face or body is always a good idea.

In addition to its use in cosmetics, propylene glycol is used in food products as a humectant, flavoring agent, and preservative. It is an ingredient in many processed foods, such as salad dressings, baked goods, and soft drinks.

It is worth noting that there have been concerns about the safety of propylene glycol due to its association with petroleum. However, it is essential to understand that propylene glycol is a highly purified compound that has been extensively tested for safety. The World Health Organization (WHO) and the United States Food and Drug Administration (FDA) have approved propylene glycol in various products, including cosmetics.

In conclusion, propylene glycol is a versatile ingredient commonly used in cosmetics because it acts as a humectant, solvent, and preservative. It is generally considered safe for use in concentrations up to 50% and is non-comedogenic, making it unlikely to clog pores and cause acne or other skin irritations. However, individuals with sensitive skin may experience irritation or allergic reactions, so it is essential to batch-test products containing this ingredient before using them all over the face or body. Overall, propylene glycol is an effective and safe ingredient that can improve the stability and effectiveness of cosmetic formulations.