Ingredient review
Ethyl Guaiazulene Sulfonate
INCI: ETHYL GUAIAZULENE SULFONATE
A gentle, water-soluble blue pigment derived from chamomile that helps calm redness and irritation without staining the skin.
In plain English
Ethyl Guaiazulene Sulfonate is a modified version of a natural compound found in chamomile and other plants. It gives products a striking blue color but is water-soluble, so it won't leave a blue tint on your skin like oil-based azulene can. Its main job in skincare is to help calm irritated or red skin, making it a popular choice for sensitive skin formulas.
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
Ethyl Guaiazulene Sulfonate 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 Ethyl Guaiazulene Sulfonate.
- 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 semi-synthetic, water-soluble derivative of guaiazulene, which is a natural azulene compound found in chamomile and wormwood. It is created by adding a sulfonate group to improve water solubility and stability.
How it works
It works by inhibiting certain inflammatory pathways in the skin, reducing the production of pro-inflammatory molecules. This helps calm redness, soothe irritation, and provide a cooling sensation. Its blue color also offers a visual cue of soothing properties in the product.
Pros
Gentle soothing action
Helps calm redness and irritation without causing further sensitivity, making it ideal for reactive skin types.
No blue staining on skin
Unlike oil-based azulene, this water-soluble version won't leave a blue tint on your face, only on your product.
Cons and cautions
May stain fabrics
The blue color can transfer to towels or pillowcases if the product hasn't fully absorbed, so be careful with application.
Moderate research backing
While azulene compounds have been studied, specific research on ethyl guaiazulene sulfonate is less extensive than for ingredients like niacinamide.
Best for
- People with sensitive or reactive skin looking for a gentle soothing ingredient
- Those dealing with occasional redness or irritation from other skincare products
Use caution if
- Anyone with a known allergy to chamomile or related plants (Asteraceae family)
Usage tips
Safety summary
Considered safe for topical use at typical concentrations. Low irritation and comedogenic risk. Patch testing is recommended for those with chamomile allergies.
Research notes
Azulene derivatives have demonstrated anti-inflammatory activity in laboratory and some clinical studies. Specific data on ethyl guaiazulene sulfonate is limited but consistent with the broader azulene family.
Common label clues
- Typical concentration
- 0.01% to 0.5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions at typical use levels.
- Common uses
- Soothing serums, Anti-redness creams, Calming masks, Sensitive skin products
- Environmental note
- Semi-synthetic production reduces reliance on natural plant harvesting, but the environmental impact of sulfonation chemistry is not well-documented.
Good to know
- The blue color is natural and comes from the azulene molecule, not synthetic dyes.
- It is often used in 'cica' or calming product lines alongside other soothing ingredients.
Common questions
What is Ethyl Guaiazulene Sulfonate in beauty products?
Ethyl Guaiazulene Sulfonate is a modified version of a natural compound found in chamomile and other plants. It gives products a striking blue color but is water-soluble, so it won't leave a blue tint on your skin like oil-based azulene can. Its main job in skincare is to help calm irritated or red skin, making it a popular choice for sensitive skin formulas.
What does Ethyl Guaiazulene Sulfonate do in a beauty product?
It works by inhibiting certain inflammatory pathways in the skin, reducing the production of pro-inflammatory molecules. This helps calm redness, soothe irritation, and provide a cooling sensation. Its blue color also offers a visual cue of soothing properties in the product.
Is Ethyl Guaiazulene Sulfonate safe for most people?
Considered safe for topical use at typical concentrations. Low irritation and comedogenic risk. Patch testing is recommended for those with chamomile allergies.
Who should be careful with Ethyl Guaiazulene Sulfonate?
Anyone with a known allergy to chamomile or related plants (Asteraceae family)
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.