Ingredient review
Magnesium Myreth Sulfate
INCI: Magnesium Myreth Sulfate
A milder sulfate surfactant that cleanses effectively but may still be too drying for very sensitive or dry skin.
In plain English
Magnesium Myreth Sulfate is a cleansing ingredient, similar to sodium lauryl sulfate but considered gentler because it is bound to magnesium instead of sodium. It helps create foam and lift away dirt, oil, and makeup from the skin and hair. While it is less irritating than some other sulfates, it can still strip natural oils if used too frequently, especially for those with dry or sensitive skin.
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
Magnesium Myreth Sulfate 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 Magnesium Myreth Sulfate.
- 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 anionic surfactant derived from myreth (a fatty alcohol from coconut or palm oil) combined with magnesium sulfate. It is part of the sulfate family but formulated to be milder.
How it works
It reduces the surface tension between water and oil, allowing impurities to be rinsed away. Its magnesium salt form makes it less aggressive on the skin barrier compared to sodium-based sulfates.
Pros
Gentler than harsher sulfates
Compared to sodium lauryl sulfate, magnesium myreth sulfate is less likely to cause immediate stinging or tightness, making it a better choice for daily cleansing.
Effective foaming cleanser
It produces a satisfying lather that helps spread the product easily, giving a thorough clean without needing to scrub hard.
Cons and cautions
Still potentially drying
Even though it is milder, regular use can strip the skin's natural moisture barrier, leading to dryness or irritation over time, especially in cold or dry climates.
Synthetic and environmental concerns
As a synthetic sulfate, it may not be fully biodegradable in all water systems, and its production relies on petrochemical or palm oil derivatives, raising sustainability questions.
Best for
- People with normal to oily skin
- Those looking for a sulfate that is gentler than SLS
Use caution if
- Individuals with very dry or compromised skin
- Those with known sulfate sensitivity or eczema
Usage tips
Safety summary
Generally recognized as safe for topical use in rinse-off products at typical concentrations. Mild irritation possible for sensitive individuals; not associated with serious health risks.
Research notes
Limited peer-reviewed studies specifically on magnesium myreth sulfate, but it is structurally similar to other alkyl sulfates. Evidence from surfactant research suggests lower irritation potential compared to sodium lauryl sulfate, but more human trials are needed.
Common label clues
- Typical concentration
- 1–15% in rinse-off products
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database at typical concentrations. No specific restrictions beyond general safety requirements.
- Common uses
- Shampoos, Body washes, Facial cleansers, Bubble baths
- Environmental note
- Synthetic surfactant; may have moderate biodegradability. Some manufacturers source palm-derived myreth, which can contribute to deforestation if not certified sustainable.
Good to know
- Magnesium myreth sulfate is often found in 'sulfate-free' labeled products? Actually, it is a sulfate, so check labels carefully if you are avoiding all sulfates.
- It is sometimes used in combination with other mild surfactants to balance cleansing power and gentleness.
Common questions
What is Magnesium Myreth Sulfate in beauty products?
Magnesium Myreth Sulfate is a cleansing ingredient, similar to sodium lauryl sulfate but considered gentler because it is bound to magnesium instead of sodium. It helps create foam and lift away dirt, oil, and makeup from the skin and hair. While it is less irritating than some other sulfates, it can still strip natural oils if used too frequently, especially for those with dry or sensitive skin.
What does Magnesium Myreth Sulfate do in a beauty product?
It reduces the surface tension between water and oil, allowing impurities to be rinsed away. Its magnesium salt form makes it less aggressive on the skin barrier compared to sodium-based sulfates.
Is Magnesium Myreth Sulfate safe for most people?
Generally recognized as safe for topical use in rinse-off products at typical concentrations. Mild irritation possible for sensitive individuals; not associated with serious health risks.
Who should be careful with Magnesium Myreth Sulfate?
Individuals with very dry or compromised skin Those with known sulfate sensitivity or eczema
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.