Ingredient review
Glyceryl Isostearate/Myristate
INCI: Glyceryl Isostearate/Myristate
A gentle emollient and emulsifier that helps soften skin and stabilize formulas, generally well-tolerated by most skin types.
In plain English
Glyceryl Isostearate/Myristate is a mixture of fatty compounds derived from glycerin and fatty acids. In skincare, it acts as an emollient, meaning it helps soften and smooth the skin by filling in the gaps between skin cells. It also works as an emulsifier, helping water and oil ingredients blend together in a stable cream or lotion. Because it is derived from natural fatty acids and is generally non-irritating, it is a common choice for gentle, everyday moisturizers.
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
Glyceryl Isostearate/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 Glyceryl Isostearate/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
A semi-synthetic ester blend created by combining glycerin with isostearic and myristic acids (both naturally occurring fatty acids). It appears as a waxy or oily substance and is used to improve the texture and feel of skincare products.
How it works
As an emollient, it forms a thin, protective layer on the skin's surface that reduces water loss and leaves skin feeling soft. As an emulsifier, it helps keep oil and water phases mixed together, preventing separation and ensuring a consistent product texture.
Pros
Gentle on skin
Glyceryl Isostearate/Myristate has a low irritation risk, making it a safe choice for sensitive skin types and daily use.
Improves product feel
As an emulsifier, it helps create smooth, stable creams and lotions that spread easily and feel luxurious on the skin.
Cons and cautions
Potential for clogging pores
While generally low-comedogenic, some individuals with very oily or acne-prone skin may find it slightly pore-clogging in high concentrations.
Less studied than alternatives
Compared to common emollients like glycerin or squalane, there is less independent research on this specific blend, though it is considered safe based on related ingredients.
Best for
- People with dry or normal skin looking for gentle hydration
- Those with sensitive skin who need a low-irritation emollient
Use caution if
- Individuals with very oily or acne-prone skin may prefer lighter, non-comedogenic alternatives
Usage tips
Safety summary
Glyceryl Isostearate/Myristate is considered safe for cosmetic use with low irritation and comedogenic potential. It is well-tolerated by most skin types, though those with very oily or acne-prone skin should monitor their individual response.
Research notes
While specific studies on this exact blend are limited, the individual fatty acids and glycerin esters have a long history of safe use in cosmetics. Expert panels (e.g., CIR) have reviewed similar esters and found them safe at typical concentrations.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and most major markets. Generally recognized as safe when used as directed.
- Common uses
- Moisturizers, Creams, Lotions, Cleansers, Makeup
- Environmental note
- Derived from plant-based fatty acids and glycerin, it is biodegradable and has a relatively low environmental impact compared to some petroleum-based emollients.
Good to know
- This ingredient is often used in combination with other emulsifiers to achieve the perfect texture.
- It is considered biodegradable and is derived from renewable plant-based fatty acids.
Common questions
What is Glyceryl Isostearate/Myristate in beauty products?
Glyceryl Isostearate/Myristate is a mixture of fatty compounds derived from glycerin and fatty acids. In skincare, it acts as an emollient, meaning it helps soften and smooth the skin by filling in the gaps between skin cells. It also works as an emulsifier, helping water and oil ingredients blend together in a stable cream or lotion. Because it is derived from natural fatty acids and is generally non-irritating, it is a common choice for gentle, everyday moisturizers.
What does Glyceryl Isostearate/Myristate do in a beauty product?
As an emollient, it forms a thin, protective layer on the skin's surface that reduces water loss and leaves skin feeling soft. As an emulsifier, it helps keep oil and water phases mixed together, preventing separation and ensuring a consistent product texture.
Is Glyceryl Isostearate/Myristate safe for most people?
Glyceryl Isostearate/Myristate is considered safe for cosmetic use with low irritation and comedogenic potential. It is well-tolerated by most skin types, though those with very oily or acne-prone skin should monitor their individual response.
Who should be careful with Glyceryl Isostearate/Myristate?
Individuals with very oily or acne-prone skin may prefer lighter, non-comedogenic alternatives
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.