Ingredient review
Tetrasodium Disuccinoyl Cystine
INCI: TETRASODIUM DISUCCINOYL CYSTINE
A mild, amino-acid-based surfactant that cleanses without stripping the skin barrier.
In plain English
Tetrasodium disuccinoyl cystine is a gentle cleansing ingredient made from the amino acid cystine. It helps remove dirt, oil, and makeup while being much less harsh than traditional sulfates. Because it's derived from a natural building block of skin, it tends to be kind to sensitive or dry skin types.
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
Tetrasodium Disuccinoyl Cystine 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 Tetrasodium Disuccinoyl Cystine.
- 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 surfactant derived from the amino acid cystine, modified with succinic acid to create a mild cleansing molecule.
How it works
It works by lowering the surface tension of water, allowing oils and dirt to be lifted away from the skin and rinsed off. Its large molecular structure makes it less penetrating and less irritating than smaller, harsher surfactants.
Pros
Very gentle on skin
Its large molecular structure means it's less likely to penetrate and irritate the skin, making it ideal for sensitive or compromised barriers.
Helps maintain moisture
Unlike harsh sulfates, it cleanses without stripping natural oils, helping the skin retain hydration after washing.
Cons and cautions
Low foam
It produces a creamy, low-lather texture, which may not satisfy those who prefer a rich, bubbly foam in their cleanser.
Can be drying alone
When used as the sole surfactant at high levels, it may still cause some dryness; it's often blended with other mild surfactants for balance.
Best for
- People with dry or sensitive skin
- Those looking for a sulfate-free cleanser
Use caution if
- Individuals seeking a high-foam, bubbly cleanser experience
Usage tips
Safety summary
Tetrasodium disuccinoyl cystine is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, and no significant safety concerns have been reported in regulatory reviews.
Research notes
Amino-acid-based surfactants like this one are well-documented in cosmetic science for their mildness and compatibility with skin. While specific studies on tetrasodium disuccinoyl cystine are limited, the broader class is supported by dermatological literature as gentle alternatives to sulfates.
Common label clues
- Typical concentration
- 1–10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most major markets. No known restrictions.
- Common uses
- Facial cleansers, Body washes, Shampoos, Micellar waters
- Environmental note
- Derived from renewable amino acids and considered biodegradable, making it a more eco-friendly surfactant choice.
Good to know
- Often listed near the middle or end of an ingredient list, indicating moderate concentration.
- Works well in both clear and creamy cleanser formulations.
Common questions
What is Tetrasodium Disuccinoyl Cystine in beauty products?
Tetrasodium disuccinoyl cystine is a gentle cleansing ingredient made from the amino acid cystine. It helps remove dirt, oil, and makeup while being much less harsh than traditional sulfates. Because it's derived from a natural building block of skin, it tends to be kind to sensitive or dry skin types.
What does Tetrasodium Disuccinoyl Cystine do in a beauty product?
It works by lowering the surface tension of water, allowing oils and dirt to be lifted away from the skin and rinsed off. Its large molecular structure makes it less penetrating and less irritating than smaller, harsher surfactants.
Is Tetrasodium Disuccinoyl Cystine safe for most people?
Tetrasodium disuccinoyl cystine is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, and no significant safety concerns have been reported in regulatory reviews.
Who should be careful with Tetrasodium Disuccinoyl Cystine?
Individuals seeking a high-foam, bubbly cleanser experience
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.