Ingredient review
Sucrose Acetate Isobutyrate
INCI: SUCROSE ACETATE ISOBUTYRATE
A sugar-based film-former that helps makeup and skincare last longer without feeling heavy or sticky.
In plain English
Sucrose Acetate Isobutyrate (SAIB) is a modified sugar molecule that forms a flexible, invisible film on your skin or lips. Think of it like a gentle, breathable glue that helps your makeup stay put and your skincare ingredients stay where you put them. It's commonly found in long-wear lipsticks, mascaras, and eyeliners because it resists smudging and fading. Despite its chemical-sounding name, it's derived from sugar and is generally considered very safe for cosmetic use.
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
Sucrose Acetate Isobutyrate 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 Sucrose Acetate Isobutyrate.
- 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
Sucrose Acetate Isobutyrate is a semi-synthetic compound made by chemically modifying sucrose (table sugar) with acetic and isobutyric acids. The result is a viscous, clear liquid that acts as a film-former and fixative in cosmetics.
How it works
When applied to the skin or lips, SAIB dries down to form a thin, flexible film that locks in pigments and other ingredients. This film is water-resistant but not completely waterproof, and it helps prevent transfer and fading. It also improves the spreadability and feel of products, making them glide on smoothly.
Pros
Long-lasting wear
Helps lipsticks, eyeliners, and foundations stay in place for hours without frequent touch-ups.
Lightweight feel
Unlike some heavy waxes or oils, SAIB forms a thin, flexible film that doesn't feel sticky or greasy on the skin.
Cons and cautions
Potential tightness on lips
Some users report a slight tightening sensation when using lip products with SAIB, which may be uncomfortable for those with dry lips.
Limited water resistance
While it resists water better than many alternatives, it is not fully waterproof and may break down with heavy sweating or swimming.
Best for
- Anyone looking for long-wearing makeup that stays put through the day
- People who prefer lightweight, non-greasy lip and eye products
Use caution if
- Those with extremely sensitive or reactive skin who prefer minimal ingredient lists
Usage tips
Safety summary
Sucrose Acetate Isobutyrate is considered safe for cosmetic use at typical concentrations. It has low irritation and comedogenic potential, and no significant toxicity concerns have been identified in standard safety assessments.
Research notes
Safety evaluations by the Cosmetic Ingredient Review (CIR) panel and the FDA support its use in cosmetics. Studies indicate it is not a skin sensitizer or irritant at typical use levels. Research on its film-forming properties is well-established in the cosmetics industry.
Common label clues
- Typical concentration
- Usually 1–10% in leave-on formulas
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has deemed it safe as used in cosmetics.
- Common uses
- Lip products, Mascara, Eyeliners, Long-wear foundations
- Environmental note
- Derived from sugar cane or sugar beets, which are renewable resources. However, the chemical modification process involves solvents and energy, so its overall eco-footprint is moderate.
Good to know
- SAIB is also used as a food additive (E444) in small amounts, but cosmetic use is well below any safety concern.
- It is often combined with other film-formers to balance flexibility and durability.
Common questions
What is Sucrose Acetate Isobutyrate in beauty products?
Sucrose Acetate Isobutyrate (SAIB) is a modified sugar molecule that forms a flexible, invisible film on your skin or lips. Think of it like a gentle, breathable glue that helps your makeup stay put and your skincare ingredients stay where you put them. It's commonly found in long-wear lipsticks, mascaras, and eyeliners because it resists smudging and fading. Despite its chemical-sounding name, it's derived from sugar and is generally considered very safe for cosmetic use.
What does Sucrose Acetate Isobutyrate do in a beauty product?
When applied to the skin or lips, SAIB dries down to form a thin, flexible film that locks in pigments and other ingredients. This film is water-resistant but not completely waterproof, and it helps prevent transfer and fading. It also improves the spreadability and feel of products, making them glide on smoothly.
Is Sucrose Acetate Isobutyrate safe for most people?
Sucrose Acetate Isobutyrate is considered safe for cosmetic use at typical concentrations. It has low irritation and comedogenic potential, and no significant toxicity concerns have been identified in standard safety assessments.
Who should be careful with Sucrose Acetate Isobutyrate?
Those with extremely sensitive or reactive skin who prefer minimal ingredient lists
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.