Ingredient review
PEG-20 Myristate
INCI: PEG-20 Myristate
A reliable synthetic emulsifier that helps products feel smooth and stable, but may not suit those avoiding PEGs.
In plain English
PEG-20 Myristate is a lab-made ingredient that helps oil and water mix together in your skincare products. Think of it as a peacekeeper that stops your lotion or cleanser from separating into a watery mess. It also helps the product spread easily on your skin and leaves a light, non-greasy feel. PEG stands for polyethylene glycol, and the number 20 refers to how many ethylene glycol units are attached to myristic acid (a fatty acid). It's a common, well-tested ingredient found in many everyday cosmetics.
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
PEG-20 Myristate 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-20 Myristate.
- 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
PEG-20 Myristate is a synthetic compound created by reacting myristic acid (a fatty acid found naturally in coconut oil and palm oil) with ethylene oxide to form a polyethylene glycol chain of 20 units. It belongs to the PEG family of emulsifiers and surfactants.
How it works
In a cosmetic product, PEG-20 Myristate sits at the boundary between oil and water droplets. Its water-loving (hydrophilic) PEG chain pulls toward water, while its oil-loving (lipophilic) myristate tail pulls toward oil. This reduces surface tension and allows the two phases to form a stable, uniform mixture. It also helps the product spread evenly and can improve the feel of the formula on skin.
Pros
Stable emulsions
PEG-20 Myristate reliably prevents oil and water from separating, so your product stays consistent from first use to last.
Light skin feel
Unlike some heavier emulsifiers, it leaves a non-greasy, smooth finish that works well in lightweight lotions and serums.
Cons and cautions
Synthetic origin
It is lab-made from petrochemicals, which may be a turn-off for those seeking natural or plant-based alternatives.
Potential trace impurities
During manufacturing, trace amounts of 1,4-dioxane (a possible contaminant) can form, though reputable brands keep levels well below safety limits set by regulators.
Best for
- Anyone using standard moisturizers or cleansers who wants a stable, well-textured product
- People with normal to combination skin looking for a lightweight emulsifier
Use caution if
- Those who strictly avoid PEGs or synthetic ingredients in their skincare routine
Usage tips
Safety summary
PEG-20 Myristate is considered safe for use in cosmetics at typical concentrations. Regulatory bodies like the CIR and EU SCCS have reviewed PEG compounds and found them safe when formulated properly. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers control this through purification processes.
Research notes
Research on PEG-20 Myristate specifically is limited, but the broader PEG family has been extensively studied. The Cosmetic Ingredient Review (CIR) panel has reviewed PEGs and concluded they are safe for cosmetic use. Studies show low skin irritation and sensitization potential at typical use levels.
Common label clues
- Typical concentration
- 1–5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has evaluated PEG compounds and deemed them safe at typical usage levels.
- Common uses
- Cleansers, Moisturizers, Lotions, Creams
- Environmental note
- PEG-20 Myristate is synthetic and not readily biodegradable. Its production involves ethylene oxide, which is derived from fossil fuels.
Good to know
- PEG-20 Myristate is considered safe by major regulatory bodies when used as directed.
- It is not typically used in high concentrations, so its impact on the formula is mostly textural.
Common questions
What is PEG-20 Myristate in beauty products?
PEG-20 Myristate is a lab-made ingredient that helps oil and water mix together in your skincare products. Think of it as a peacekeeper that stops your lotion or cleanser from separating into a watery mess. It also helps the product spread easily on your skin and leaves a light, non-greasy feel. PEG stands for polyethylene glycol, and the number 20 refers to how many ethylene glycol units are attached to myristic acid (a fatty acid). It's a common, well-tested ingredient found in many everyday cosmetics.
What does PEG-20 Myristate do in a beauty product?
In a cosmetic product, PEG-20 Myristate sits at the boundary between oil and water droplets. Its water-loving (hydrophilic) PEG chain pulls toward water, while its oil-loving (lipophilic) myristate tail pulls toward oil. This reduces surface tension and allows the two phases to form a stable, uniform mixture. It also helps the product spread evenly and can improve the feel of the formula on skin.
Is PEG-20 Myristate safe for most people?
PEG-20 Myristate is considered safe for use in cosmetics at typical concentrations. Regulatory bodies like the CIR and EU SCCS have reviewed PEG compounds and found them safe when formulated properly. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers control this through purification processes.
Who should be careful with PEG-20 Myristate?
Those who strictly avoid PEGs or synthetic ingredients in their skincare routine
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.