Ingredient review
PPG-23 Steareth-34
INCI: PPG-23 Steareth-34
A reliable synthetic emulsifier that stabilizes formulas but offers no direct skin benefit.
In plain English
PPG-23 Steareth-34 is a man-made ingredient that helps oil and water mix together in products like lotions and cleansers. Without it, many creams would separate into watery and oily layers. It doesn't actively moisturize or treat the skin, but it makes the texture smooth and consistent so the product feels nice to use.
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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
PPG-23 Steareth-34 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 PPG-23 Steareth-34.
- 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 synthetic polymer made by combining propylene glycol (PPG) and a fatty alcohol derivative (Steareth). It belongs to a class of ingredients called emulsifiers, which are essential for creating stable oil-in-water or water-in-oil mixtures.
How it works
Its molecule has both water-loving (hydrophilic) and oil-loving (lipophilic) parts. When added to a formula, it positions itself at the boundary between oil and water droplets, reducing surface tension so they stay blended. This prevents separation and gives the product a uniform, creamy texture.
Pros
Effective stabilizer
Keeps oil and water mixed so your product stays smooth and doesn't separate, even after months on the shelf.
Low irritation potential
Generally well-tolerated by most skin types, including sensitive skin, when used at typical concentrations.
Cons and cautions
No active benefit
It doesn't hydrate, soothe, or protect the skin — its only job is to improve the formula's texture and stability.
Synthetic and non-biodegradable
As a PEG-based polymer, it is not biodegradable and may raise environmental concerns for eco-conscious consumers.
Best for
- Anyone using conventional creams, lotions, or cleansers (it's already in most)
- People who prefer stable, consistent product textures
Use caution if
- Those strictly avoiding all synthetic ingredients or PEG compounds
Usage tips
Safety summary
PPG-23 Steareth-34 is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential. However, as a PEG derivative, some consumers prefer to avoid it due to concerns about potential impurities (e.g., ethylene oxide or 1,4-dioxane), though these are tightly regulated and typically present only in trace amounts in well-manufactured ingredients.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that PPG and PEG alkyl ethers are safe in cosmetics when formulated to minimize impurities. No specific studies on PPG-23 Steareth-34 alone were found, but its chemical class is well-characterized and considered low-risk.
Common label clues
- Typical concentration
- Usually 1–5% in rinse-off products, lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and many other regions. No specific restrictions at typical use levels.
- Common uses
- Cleansers, Moisturizers, Lotions, Creams
- Environmental note
- As a synthetic polymer, it is not readily biodegradable. Its environmental impact is considered low due to typical low concentrations in rinse-off products.
Good to know
- PPG stands for polypropylene glycol, a common building block in many cosmetic emulsifiers.
- Steareth-34 indicates it's derived from stearyl alcohol, a fatty alcohol from plant or synthetic sources.
Common questions
What is PPG-23 Steareth-34 in beauty products?
PPG-23 Steareth-34 is a man-made ingredient that helps oil and water mix together in products like lotions and cleansers. Without it, many creams would separate into watery and oily layers. It doesn't actively moisturize or treat the skin, but it makes the texture smooth and consistent so the product feels nice to use.
What does PPG-23 Steareth-34 do in a beauty product?
Its molecule has both water-loving (hydrophilic) and oil-loving (lipophilic) parts. When added to a formula, it positions itself at the boundary between oil and water droplets, reducing surface tension so they stay blended. This prevents separation and gives the product a uniform, creamy texture.
Is PPG-23 Steareth-34 safe for most people?
PPG-23 Steareth-34 is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential. However, as a PEG derivative, some consumers prefer to avoid it due to concerns about potential impurities (e.g., ethylene oxide or 1,4-dioxane), though these are tightly regulated and typically present only in trace amounts in well-manufactured ingredients.
Who should be careful with PPG-23 Steareth-34?
Those strictly avoiding all synthetic ingredients or PEG compounds
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.