Ingredient review
Stearyl Gallate
INCI: Stearyl Gallate
Stearyl Gallate is a synthetic antioxidant that helps keep oils fresh in skincare products, but it may cause skin sensitivity in rare cases.
In plain English
Stearyl Gallate is a man-made ingredient that prevents oils and fats in your moisturizer or serum from going bad. It works by stopping the chemical reaction that makes oils smell off or change texture. Think of it as a preservative helper that keeps your product stable and effective longer. While generally safe, a small number of people might experience irritation, especially if they have very 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
Stearyl Gallate 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 Stearyl Gallate.
- 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
Stearyl Gallate is the stearyl ester of gallic acid, a phenolic compound. It is a white to off-white powder that is oil-soluble and used primarily as an antioxidant in cosmetic formulations.
How it works
It donates hydrogen atoms to free radicals, neutralizing them before they can attack unsaturated fatty acids in oils. This prevents lipid peroxidation, which would otherwise cause rancidity, color changes, and unpleasant odors in the product.
Pros
Effective antioxidant
Stearyl Gallate is highly effective at preventing oil rancidity, which means your moisturizer stays fresh and effective longer.
Low usage level
Only a tiny amount is needed (0.01%–0.1%) to protect the formula, so it rarely causes issues for most skin types.
Cons and cautions
Potential sensitizer
In rare cases, especially at higher concentrations, it may cause allergic contact dermatitis or skin irritation.
Synthetic origin
It is not naturally derived, which may be a concern for those seeking exclusively natural or plant-based skincare.
Best for
- Anyone using oil-rich creams or serums
- People who want fresher, longer-lasting products
Use caution if
- Individuals with known sensitivity to gallate esters or phenolic antioxidants
Usage tips
Safety summary
Stearyl Gallate is considered safe for use in cosmetics at low concentrations. The Cosmetic Ingredient Review (CIR) panel has evaluated it and found it safe when formulated to be non-irritating. However, as with any antioxidant, rare allergic reactions are possible.
Research notes
Research on Stearyl Gallate is limited compared to more common antioxidants. Most evidence comes from its use as a food preservative, where it is effective at preventing oxidation. Topical safety data is primarily from industry reports and regulatory reviews.
Common label clues
- Typical concentration
- Typically used at 0.01% to 0.1%
- Regulatory status
- Approved for use in cosmetics in the EU (Annex V) and by the US FDA as a direct food additive, with concentration limits typically below 0.1% in leave-on products.
- Common uses
- Moisturizers, Anti-aging creams, Lip products, Sunscreens
- Environmental note
- As a synthetic compound, its environmental persistence is not well-studied, but it is used in very low concentrations, limiting potential ecological impact.
Good to know
- Stearyl Gallate is often used alongside other antioxidants like Tocopherol for a synergistic effect.
- It is approved for use in cosmetics in the EU and US within regulated concentration limits.
Common questions
What is Stearyl Gallate in beauty products?
Stearyl Gallate is a man-made ingredient that prevents oils and fats in your moisturizer or serum from going bad. It works by stopping the chemical reaction that makes oils smell off or change texture. Think of it as a preservative helper that keeps your product stable and effective longer. While generally safe, a small number of people might experience irritation, especially if they have very sensitive skin.
What does Stearyl Gallate do in a beauty product?
It donates hydrogen atoms to free radicals, neutralizing them before they can attack unsaturated fatty acids in oils. This prevents lipid peroxidation, which would otherwise cause rancidity, color changes, and unpleasant odors in the product.
Is Stearyl Gallate safe for most people?
Stearyl Gallate is considered safe for use in cosmetics at low concentrations. The Cosmetic Ingredient Review (CIR) panel has evaluated it and found it safe when formulated to be non-irritating. However, as with any antioxidant, rare allergic reactions are possible.
Who should be careful with Stearyl Gallate?
Individuals with known sensitivity to gallate esters or phenolic antioxidants
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.