Ingredient review
Methyl Hydroxystearate
INCI: Methyl Hydroxystearate
A gentle, non-greasy emollient that helps soften and smooth the skin with a low risk of irritation or clogged pores.
In plain English
Methyl Hydroxystearate is a waxy ingredient made from castor oil. It helps moisturizers and makeup feel silky and spread easily on the skin without leaving a heavy or sticky residue. Think of it as a skin-friendly lubricant that makes products feel nicer to apply.
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
Methyl Hydroxystearate 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 Methyl Hydroxystearate.
- 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
Methyl Hydroxystearate is an ester formed by reacting hydroxystearic acid (derived from castor oil) with methanol. It appears as a waxy solid at room temperature and is used to improve the texture and feel of cosmetic products.
How it works
It sits on the surface of the skin, forming a thin, breathable film that reduces water loss (trans-epidermal water loss, or TEWL) and makes the skin feel softer and smoother. It also helps other ingredients spread evenly and gives products a luxurious, non-greasy finish.
Pros
Gentle on skin
Methyl Hydroxystearate has a very low irritation and comedogenic rating, making it suitable for sensitive and acne-prone skin types.
Improves product feel
It gives creams and lotions a silky, smooth texture that glides on easily without feeling sticky or greasy.
Cons and cautions
May not suit very oily skin
While lightweight, it is still an emollient and could feel slightly heavy for those with extremely oily skin who prefer water-only products.
Limited standalone benefits
It works best as a texture enhancer and mild moisturizer; it does not provide active anti-aging or brightening effects on its own.
Best for
- People with dry or normal skin looking for a gentle emollient
- Anyone who prefers lightweight, non-greasy moisturizers
Use caution if
- Those with known allergies to castor oil derivatives
- Individuals seeking purely water-based, oil-free formulations
Usage tips
Safety summary
Methyl Hydroxystearate is considered safe for cosmetic use with very low irritation and sensitization potential. It is non-comedogenic and well-tolerated by most skin types.
Research notes
Studies confirm its role as a safe emollient and skin conditioner. The Cosmetic Ingredient Review (CIR) panel has evaluated similar esters and found them safe for use in cosmetics at typical concentrations.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. Generally recognized as safe when used as directed.
- Common uses
- Moisturizers, Lipsticks, Creams, Lotions, Makeup
- Environmental note
- Derived from castor oil, a renewable plant source. The esterification process is relatively low-impact, but the ingredient is not biodegradable in all environments.
Good to know
- Methyl Hydroxystearate is often used in lip products because it provides a smooth, non-tacky feel.
- It is considered a 'green' ingredient as it is derived from renewable castor oil.
Common questions
What is Methyl Hydroxystearate in beauty products?
Methyl Hydroxystearate is a waxy ingredient made from castor oil. It helps moisturizers and makeup feel silky and spread easily on the skin without leaving a heavy or sticky residue. Think of it as a skin-friendly lubricant that makes products feel nicer to apply.
What does Methyl Hydroxystearate do in a beauty product?
It sits on the surface of the skin, forming a thin, breathable film that reduces water loss (trans-epidermal water loss, or TEWL) and makes the skin feel softer and smoother. It also helps other ingredients spread evenly and gives products a luxurious, non-greasy finish.
Is Methyl Hydroxystearate safe for most people?
Methyl Hydroxystearate is considered safe for cosmetic use with very low irritation and sensitization potential. It is non-comedogenic and well-tolerated by most skin types.
Who should be careful with Methyl Hydroxystearate?
Those with known allergies to castor oil derivatives Individuals seeking purely water-based, oil-free formulations
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.