Ingredient review
Ditridecyl Thiodipropionate
INCI: DITRIDECYL THIODIPROPIONATE
A synthetic antioxidant that helps keep oils and butters fresh, but it's not a star active for skin benefits.
In plain English
Ditridecyl thiodipropionate is a man-made ingredient that acts like a preservative for oils and fats in your skincare products. It stops them from going rancid (developing an off smell or texture) by neutralizing the oxygen that can spoil them. You won't find it doing anything dramatic for your skin—it's more of a behind-the-scenes helper that keeps the formula stable and longer-lasting.
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
Ditridecyl 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 Ditridecyl 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 thiodipropionic acid and tridecyl alcohol, used primarily as an antioxidant and stabilizer in cosmetic formulations.
How it works
It works by donating electrons to neutralize free radicals that would otherwise attack and break down oils and fats in the product. This prevents oxidation, which can cause discoloration, off-odors, and texture changes. It does not significantly interact with skin cells.
Pros
Extends freshness
Helps prevent oils and butters in your moisturizer or lipstick from going rancid, so the product stays effective and pleasant to use longer.
Low irritation risk
Generally well-tolerated by most skin types, including sensitive skin, with very low reported irritation or allergic reactions.
Cons and cautions
No direct skin benefit
Unlike active antioxidants like vitamin C or E, this ingredient doesn't provide noticeable anti-aging or brightening effects on your skin.
Synthetic origin
It is a lab-made compound, which may be a turn-off if you prefer naturally derived or 'clean' cosmetic ingredients.
Best for
- Anyone using oil-rich products like face oils or balms
- People who want their products to stay fresh longer
Use caution if
- Those seeking ingredients with proven skin benefits
- Strict 'no synthetic additives' users
Usage tips
Safety summary
Ditridecyl thiodipropionate is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, and no significant health concerns have been identified by regulatory bodies.
Research notes
Research primarily focuses on its function as an antioxidant in formulations rather than skin benefits. It is well-documented as a stabilizer in cosmetic chemistry literature.
Common label clues
- Typical concentration
- Typically 0.1% to 1%
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng database) within typical concentrations.
- Common uses
- Moisturizers, Lipsticks, Sunscreens, Hair conditioners
- Environmental note
- As a synthetic compound, its biodegradability is limited; however, it is used in very low concentrations in products.
Good to know
- It is approved for use in cosmetics by the FDA and the EU Cosmetics Regulation.
- Often listed near the end of an ingredient list because it's used in small amounts.
Common questions
What is Ditridecyl Thiodipropionate in beauty products?
Ditridecyl thiodipropionate is a man-made ingredient that acts like a preservative for oils and fats in your skincare products. It stops them from going rancid (developing an off smell or texture) by neutralizing the oxygen that can spoil them. You won't find it doing anything dramatic for your skin—it's more of a behind-the-scenes helper that keeps the formula stable and longer-lasting.
What does Ditridecyl Thiodipropionate do in a beauty product?
It works by donating electrons to neutralize free radicals that would otherwise attack and break down oils and fats in the product. This prevents oxidation, which can cause discoloration, off-odors, and texture changes. It does not significantly interact with skin cells.
Is Ditridecyl Thiodipropionate safe for most people?
Ditridecyl thiodipropionate is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, and no significant health concerns have been identified by regulatory bodies.
Who should be careful with Ditridecyl Thiodipropionate?
Those seeking ingredients with proven skin benefits Strict 'no synthetic additives' users
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.