Ingredient review

PEG-5 Tristearyl Citrate

INCI: PEG-5 Tristearyl Citrate

A reliable, low-irritation emulsifier that helps create smooth, stable creams and lotions without clogging pores.

beautyskincareemulsifier

In plain English

PEG-5 Tristearyl Citrate is an ingredient that helps water and oil mix together in your skincare products, so you get a smooth, creamy texture instead of a watery mess. It's made from citric acid (found in citrus fruits) and fatty alcohols (from plant oils), and it's processed to be very gentle on skin. You'll find it in moisturizers, sunscreens, and lotions where it keeps the formula stable and easy to apply.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

PEG-5 Tristearyl Citrate 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging PEG-5 Tristearyl Citrate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A semi-synthetic emulsifier created by reacting citric acid with stearyl alcohol (a fatty alcohol from plant sources) and adding a short chain of polyethylene glycol (PEG) to improve water solubility. It belongs to the citrate ester family, known for mildness.

How it works

It sits at the boundary between oil and water droplets, reducing surface tension so they blend into a stable emulsion. This prevents your cream from separating into oily and watery layers, and helps the product spread evenly on your skin.

Pros

Very gentle on skin

PEG-5 Tristearyl Citrate has a low irritation risk, making it suitable for sensitive skin types and daily use in moisturizers and sunscreens.

Stable emulsions

It reliably prevents oil and water from separating, so your product stays smooth and effective from first use to last.

Cons and cautions

PEG-related purity concerns

As a PEG derivative, it may contain trace amounts of ethylene oxide or 1,4-dioxane if not properly purified, though reputable manufacturers follow strict safety standards.

Limited to emulsion formulas

This ingredient only works in products that contain both oil and water phases, so it's not used in anhydrous balms or powders.

Best for

  • Anyone looking for a gentle, non-irritating moisturizer or cream
  • People with sensitive or reactive skin who want stable formulas without harsh emulsifiers

Use caution if

  • Those who strictly avoid all PEG-derived ingredients due to personal preference

Usage tips

Use in the oil phase of your formulation and heat to around 70°C for proper incorporation.
Combine with a co-emulsifier like cetearyl alcohol for extra stability in thicker creams.

Safety summary

PEG-5 Tristearyl Citrate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. As with all PEGs, quality control during manufacturing is important to minimize impurities, but reputable brands ensure purity.

Research notes

Citrate esters like PEG-5 Tristearyl Citrate are well-studied as mild emulsifiers. Safety assessments by the Cosmetic Ingredient Review (CIR) panel have found PEG compounds safe for use in cosmetics when properly formulated. Specific studies on this exact ingredient are limited, but its chemical class is well understood.

Common label clues

Typical concentration
1–5%
Regulatory status
Approved for use in cosmetics in the EU, US, and many other regions. No specific restrictions beyond general cosmetic safety requirements.
Common uses
Moisturizers, Creams, Lotions, Sunscreens
Environmental note
PEG compounds are generally biodegradable, but their production involves petrochemical processing. Plant-derived fatty alcohols reduce the overall environmental footprint.

Good to know

  • PEG-5 Tristearyl Citrate is often used in 'natural' or 'gentle' skincare lines because of its citric acid origin and mild profile.
  • The number '5' refers to the average length of the PEG chain, which affects how water-loving the molecule is.

Common questions

What is PEG-5 Tristearyl Citrate in beauty products?

PEG-5 Tristearyl Citrate is an ingredient that helps water and oil mix together in your skincare products, so you get a smooth, creamy texture instead of a watery mess. It's made from citric acid (found in citrus fruits) and fatty alcohols (from plant oils), and it's processed to be very gentle on skin. You'll find it in moisturizers, sunscreens, and lotions where it keeps the formula stable and easy to apply.

What does PEG-5 Tristearyl Citrate do in a beauty product?

It sits at the boundary between oil and water droplets, reducing surface tension so they blend into a stable emulsion. This prevents your cream from separating into oily and watery layers, and helps the product spread evenly on your skin.

Is PEG-5 Tristearyl Citrate safe for most people?

PEG-5 Tristearyl Citrate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. As with all PEGs, quality control during manufacturing is important to minimize impurities, but reputable brands ensure purity.

Who should be careful with PEG-5 Tristearyl Citrate?

Those who strictly avoid all PEG-derived ingredients due to personal preference

Research sources

Cosmetic Ingredient Review (CIR) – Safety Assessment of PEGsOpenPubChem – PEG-5 Tristearyl CitrateOpenEuropean Commission – CosIng DatabaseOpen

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.