Ingredient review
PEG-35 Soy Glycerides
INCI: PEG-35 SOY GLYCERIDES
A reliable, low-irritation emulsifier that helps create smooth, stable creams and lotions without clogging pores.
In plain English
PEG-35 Soy Glycerides is a helper ingredient that allows oil and water to mix together in your skincare products. It is made by attaching a chain of ethylene glycol (the 'PEG' part) to glycerides from soybean oil. This makes it a gentle emulsifier that creates a smooth, even texture in creams and lotions. It also has mild skin-conditioning properties, meaning it can leave your skin feeling soft without being greasy.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
PEG-35 Soy Glycerides is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging PEG-35 Soy Glycerides.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A semi-synthetic emulsifier produced by reacting soybean oil glycerides with polyethylene glycol (PEG). The '35' refers to the average number of ethylene oxide units in the PEG chain, which determines its water-loving properties.
How it works
In a cosmetic formula, PEG-35 Soy Glycerides sits at the boundary between oil and water droplets, reducing surface tension so they can blend into a stable emulsion. This prevents your cream or lotion from separating into watery and oily layers. It also forms a thin film on the skin that helps retain moisture and gives a smooth feel.
Pros
Gentle on skin
PEG-35 Soy Glycerides has a very low irritation risk, making it suitable for sensitive skin types and daily use in moisturizers and cleansers.
Non-comedogenic
Unlike some heavier emulsifiers, this ingredient is unlikely to clog pores, so it works well in products for acne-prone or oily skin.
Cons and cautions
Manufacturing purity concerns
PEG compounds can contain trace impurities like 1,4-dioxane if not properly purified. Reputable brands ensure their suppliers follow strict purification processes.
Not fully biodegradable
The PEG chain can persist in the environment, which may be a concern for eco-conscious consumers looking for fully biodegradable ingredients.
Best for
- Anyone looking for a gentle, non-irritating moisturizer or cleanser
- People with sensitive or acne-prone skin who want a lightweight, non-clogging formula
Use caution if
- Those who prefer to avoid all PEG-derived ingredients due to personal or environmental concerns
Usage tips
Safety summary
PEG-35 Soy Glycerides is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers and brands ensure purification to meet safety standards. It has low irritation and comedogenic potential.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated PEG compounds and concluded they are safe for cosmetic use when formulated to be non-irritating and free of harmful impurities. Individual studies on PEG-35 Soy Glycerides are limited, but its safety profile is supported by the broader class of PEG derivatives.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has reviewed PEG compounds and found them safe when formulated to minimize impurities.
- Common uses
- Moisturizers, Cleansers, Serums, Sunscreens
- Environmental note
- PEG derivatives are not readily biodegradable in all environments. However, they are used in low concentrations and are generally considered low-risk in rinse-off products.
Good to know
- The '35' in the name indicates the PEG chain length, which affects how water-loving the ingredient is.
- PEG-35 Soy Glycerides is often used in combination with other emulsifiers to create a more stable and elegant product texture.
Common questions
What is PEG-35 Soy Glycerides in beauty products?
PEG-35 Soy Glycerides is a helper ingredient that allows oil and water to mix together in your skincare products. It is made by attaching a chain of ethylene glycol (the 'PEG' part) to glycerides from soybean oil. This makes it a gentle emulsifier that creates a smooth, even texture in creams and lotions. It also has mild skin-conditioning properties, meaning it can leave your skin feeling soft without being greasy.
What does PEG-35 Soy Glycerides do in a beauty product?
In a cosmetic formula, PEG-35 Soy Glycerides sits at the boundary between oil and water droplets, reducing surface tension so they can blend into a stable emulsion. This prevents your cream or lotion from separating into watery and oily layers. It also forms a thin film on the skin that helps retain moisture and gives a smooth feel.
Is PEG-35 Soy Glycerides safe for most people?
PEG-35 Soy Glycerides is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers and brands ensure purification to meet safety standards. It has low irritation and comedogenic potential.
Who should be careful with PEG-35 Soy Glycerides?
Those who prefer to avoid all PEG-derived ingredients due to personal or environmental concerns
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.