Ingredient
PEG-40 Stearate
What is PEG-40 Stearate?
PEG-40 Stearate is a synthetic ester derived from the combination of stearic acid, a fatty acid, and polyethylene glycol (PEG). Its production involves chemical processing to bond these components, resulting in a surfactant with dual affinity for water and oil, making it effective in mixing or stabilizing emulsions.
It is commonly used in cosmetics and personal care products for its ability to help blend ingredients and improve the texture and spreadability of formulations. Health assessments typically consider PEG-40 Stearate safe for use on the skin, though there can be concerns about potential impurities like ethylene oxide or 1,4-dioxane from the manufacturing process.
When you see PEG-40 Stearate on a label, it's mainly functioning to keep components evenly dispersed. There's minimal evidence of systemic absorption when used in topical applications, but those with highly sensitive skin might want to patch-test new products.
Commonly found in: body lotions, creams, cleansers, hair conditioners, moisturizers
What to watch
- Potential contaminants from synthesis, like 1,4-dioxane, can be concerning if not properly removed.
The FDA considers PEG compounds safe for use in cosmetics, although they regulate the levels of impurities like 1,4-dioxane.
Research indicates PEG compounds are generally safe for topical use, but impurities from the manufacturing process warrant a cautious approach.
PEG-40 Stearate is typically plant-derived and suitable for vegan products, though sourcing can vary.
Sources: Cosmetic Ingredient Review · Hazard Assessment of Polyethylene Glycol and its Derivatives
Scout's take
PEG-40 stearate is used as an emulsifier and surfactant in cosmetics. It helps to stabilize and thicken formulations. It is generally considered safe for use in skincare.
The case against
There are minimal risks, though it may cause irritation in sensitive individuals.
from the analysis of Palmer's Cocoa Butter Formula® with Vitamin E Daily Body Lotion Tahitian VanillaThe case for
It helps to maintain the structure and consistency of the lotion.
from the analysis of Palmer's Cocoa Butter Formula® with Vitamin E Daily Body Lotion Tahitian VanillaFound in 1 product
Scan any product to see every ingredient explained — and healthier swaps.
Download on theApp Store GET IT ONGoogle Play