Article last updated: October 15, 2024
PEG-8, also known as Polyethylene Glycol 8, is a synthetic compound derived from petroleum. It’s a member of the Polyethylene Glycol (PEG) family, a group of compounds that vary in molecular weight and properties depending on the number of ethylene glycol units they contain. In the case of PEG-8, it has an average of 8 ethylene glycol units, hence its name.
The history of PEG-8 in cosmetics dates back several decades. It was first introduced into the beauty industry for its unique properties as a humectant and solvent. As a humectant, it has the ability to attract and retain moisture, making it a key ingredient in many hydrating skincare products. As a solvent, it’s used to dissolve other ingredients, helping to create a smooth, even texture in products like creams and lotions.
The production of PEG-8 involves a process known as ethoxylation, where ethylene oxide is reacted with other substances to create a compound with the desired properties. In this case, the ethylene oxide is reacted with water to create PEG-8. This process is carefully controlled to ensure the final product is safe and effective for use in cosmetics.
In this section, we will delve into the officially recognized benefits and uses of PEG-8:
As a humectant, PEG-8 plays a crucial role in maintaining the moisture balance of the skin. It works by attracting water molecules from the surrounding environment and binding them to the skin. This helps to keep the skin hydrated, soft, and supple. In a cosmetic context, this means that products containing PEG-8 can help to prevent dryness and flaking, and can improve the overall appearance and feel of the skin.
PEG-8 also functions as a solvent in cosmetic formulations. This means it is used to dissolve or dilute other ingredients, making it easier to mix them together. In practical terms, this helps to ensure that the product has a smooth and even consistency, and that the active ingredients are evenly distributed throughout the product. This is particularly important in products such as creams and lotions, where a smooth texture is essential for easy application and absorption.
Note: the listed benefits above are exclusively based on the officially recognized and defined functions of the ingredient, as documented by the International Nomenclature of Cosmetic Ingredients (INCI).
PEG-8, also known as Poly(oxy-1,2-ethanediyl), .alpha.-hydro-.omega.-hydroxy-, (8 mol EO average molar ratio), is generally considered safe for use in cosmetics. However, like any ingredient, it may cause adverse reactions in some individuals. Its safety has been assessed by the Cosmetic Ingredient Review (CIR) Expert Panel, a group of independent scientists who evaluate the safety of cosmetic ingredients. They concluded that PEG-8 is safe as a cosmetic ingredient as long as it is used as intended.
Despite its general safety, there are potential side effects associated with the topical application of PEG-8. These include:
Regarding individuals who are pregnant or breastfeeding, there is currently insufficient data on the safety of topical use of products containing PEG-8. Therefore, it is recommended that these individuals consult a healthcare professional for further advice.
While adverse reactions to PEG-8 are not common, it is always a good idea to conduct a patch test before using a new product. This involves applying a small amount of the product to a discreet area of skin and waiting 24 hours to see if any adverse reactions occur.
As for its comedogenicity, PEG-8 is rated as a 1 on a scale of 0 to 5, with 0 being totally non-comedogenic and 5 being highly comedogenic. This means that it is unlikely to clog pores and cause acne or blemishes. However, everyone’s skin is different, and what works for one person may not work for another. Therefore, if you are prone to acne or breakouts, it is important to monitor your skin’s reaction to any new product containing PEG-8.
