Ingredient review
Hydroxydimethyloctanal Distillate
INCI: 7-HYDROXY-3,7-DIMETHYL-OCTANAL DISTILLATES
A common floral fragrance ingredient that can cause skin irritation or allergies in sensitive individuals.
In plain English
This ingredient is a synthetic fragrance compound that smells like lily of the valley. It's made by modifying a natural compound found in citronella oil. While it adds a pleasant scent to products, it's also a known allergen that can cause contact dermatitis in some people, especially with repeated use.
Quick decision guide
Useful, but context matters
Hydroxydimethyloctanal Distillate can be useful, but watch for some irritation potential.
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 Hydroxydimethyloctanal Distillate.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
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 aldehyde compound produced by the distillation of hydroxycitronellal, which itself is derived from citronellal (a component of citronella and lemongrass oils). It is used exclusively as a fragrance ingredient.
How it works
It evaporates from the skin's surface, releasing a floral scent. It does not provide any skincare benefit beyond fragrance. In some individuals, it can penetrate the skin and trigger an immune response leading to allergic contact dermatitis.
Pros
Pleasant floral scent
Provides a classic lily-of-the-valley fragrance that is widely appreciated in perfumery and skincare.
Low comedogenic risk
Unlikely to clog pores, making it suitable for non-sensitive skin types concerned about breakouts.
Cons and cautions
Common allergen
Listed as a known allergen by the EU Cosmetics Regulation; can cause allergic contact dermatitis in sensitized individuals.
No skincare benefit
Serves only as a fragrance; adds no moisturizing, anti-aging, or protective properties to the product.
Best for
- Those who enjoy floral-scented products and have no known fragrance allergies
- People with resilient, non-sensitive skin
Use caution if
- Individuals with a known allergy to fragrance or hydroxycitronellal
- Those with sensitive, reactive, or eczema-prone skin
Usage tips
Safety summary
Generally safe for most people at low concentrations, but it is a recognized contact allergen. The Cosmetic Ingredient Review (CIR) panel has deemed it safe for use in cosmetics when formulated to be non-irritating. However, individuals with fragrance allergies should avoid it.
Research notes
Multiple studies confirm that hydroxycitronellal is a common cause of allergic contact dermatitis in patch-tested populations. Research also shows that oxidation over time can increase its allergenic potential. Regulatory bodies in the EU and Japan have set specific labeling requirements for this ingredient.
Common label clues
- Typical concentration
- Usually below 1% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. In the EU, it must be listed on the label when present above 0.001% in leave-on products or 0.01% in rinse-off products due to its allergenic potential.
- Common uses
- Fragranced creams, Lotions, Perfumes, Body washes
- Environmental note
- As a semi-synthetic compound, its production has a lower environmental footprint than harvesting rare natural floral extracts, but it is not biodegradable in all conditions.
Good to know
- This ingredient is often listed simply as 'fragrance' or 'parfum' on labels, but in the EU it must be declared separately if above certain levels.
- Hydroxycitronellal is one of 26 fragrance allergens that require special labeling in the European Union.
Common questions
What is Hydroxydimethyloctanal Distillate in beauty products?
This ingredient is a synthetic fragrance compound that smells like lily of the valley. It's made by modifying a natural compound found in citronella oil. While it adds a pleasant scent to products, it's also a known allergen that can cause contact dermatitis in some people, especially with repeated use.
What does Hydroxydimethyloctanal Distillate do in a beauty product?
It evaporates from the skin's surface, releasing a floral scent. It does not provide any skincare benefit beyond fragrance. In some individuals, it can penetrate the skin and trigger an immune response leading to allergic contact dermatitis.
Is Hydroxydimethyloctanal Distillate safe for most people?
Generally safe for most people at low concentrations, but it is a recognized contact allergen. The Cosmetic Ingredient Review (CIR) panel has deemed it safe for use in cosmetics when formulated to be non-irritating. However, individuals with fragrance allergies should avoid it.
Who should be careful with Hydroxydimethyloctanal Distillate?
Individuals with a known allergy to fragrance or hydroxycitronellal Those with sensitive, reactive, or eczema-prone skin
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.