Ingredient review
Dimyristyl Thiodipropionate
INCI: DIMYRISTYL THIODIPROPIONATE
A gentle synthetic antioxidant that helps keep oils and butters in your skincare products fresh and stable.
In plain English
Dimyristyl thiodipropionate is a man-made ingredient that acts like a bodyguard for the oils and fats in your skincare products. It stops them from going bad (oxidizing) when exposed to air or light, which can make products smell off or lose effectiveness. It also has a mild softening effect on the 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
Dimyristyl Thiodipropionate 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 Dimyristyl Thiodipropionate.
- 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 diester of myristyl alcohol and thiodipropionic acid. It belongs to a family of thioester antioxidants commonly used to protect oils and fats in cosmetics.
How it works
It works by donating electrons to neutralize free radicals that would otherwise attack and break down oils and butters in the formula. This extends the shelf life of the product and helps maintain its texture and performance. On skin, it provides a light emollient feel without greasiness.
Pros
Extends product shelf life
Helps prevent oils and butters from turning rancid, so your moisturizer stays effective and smells fresh longer.
Very gentle on skin
Has a low irritation and comedogenic risk, making it suitable even for sensitive or acne-prone skin types.
Cons and cautions
Synthetic origin
Not derived from natural sources, which may be a drawback for those preferring plant-based or naturally derived ingredients.
Limited direct skin benefit
Its primary role is formula preservation rather than providing active antioxidant protection to the skin itself.
Best for
- Anyone using oil-rich creams or serums
- People with normal to dry skin looking for gentle preservation
Use caution if
- Those seeking exclusively natural or plant-based ingredients
- Individuals with known sensitivity to thioester compounds (rare)
Usage tips
Safety summary
Dimyristyl thiodipropionate is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential. No significant safety concerns have been raised by regulatory bodies.
Research notes
Research primarily focuses on its efficacy as an antioxidant in cosmetic formulations. It is well-documented as a stabilizer for oils and fats. Direct studies on skin absorption or long-term effects are limited, but existing safety assessments support its use.
Common label clues
- Typical concentration
- 0.1% to 1%
- Regulatory status
- Approved for use in cosmetics in the EU, USA, and many other regions. Generally recognized as safe at typical use levels.
- Common uses
- Moisturizers, Sunscreens, Lip products, Anti-aging creams
- Environmental note
- As a synthetic compound, its biodegradability is limited compared to natural antioxidants. However, it is used in very small amounts.
Good to know
- Often used alongside other antioxidants to create a more robust preservation system.
- Approved for use in cosmetics globally, including by the EU and FDA.
Common questions
What is Dimyristyl Thiodipropionate in beauty products?
Dimyristyl thiodipropionate is a man-made ingredient that acts like a bodyguard for the oils and fats in your skincare products. It stops them from going bad (oxidizing) when exposed to air or light, which can make products smell off or lose effectiveness. It also has a mild softening effect on the skin.
What does Dimyristyl Thiodipropionate do in a beauty product?
It works by donating electrons to neutralize free radicals that would otherwise attack and break down oils and butters in the formula. This extends the shelf life of the product and helps maintain its texture and performance. On skin, it provides a light emollient feel without greasiness.
Is Dimyristyl Thiodipropionate safe for most people?
Dimyristyl thiodipropionate is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential. No significant safety concerns have been raised by regulatory bodies.
Who should be careful with Dimyristyl Thiodipropionate?
Those seeking exclusively natural or plant-based ingredients Individuals with known sensitivity to thioester compounds (rare)
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.