What Is Ethylhexylbicycloheptene Dicarboximide?
Ethylhexylbicycloheptene Dicarboximide is a lab made compound created from a bicyclic backbone called norbornene that is reacted with an ethylhexyl side chain and two carboximide groups. The finished ingredient looks like a clear to pale yellow liquid that blends easily with oils and many common cosmetic solvents. It was first developed in the 1970s for use in household insect repellents because the structure helps active materials last longer on skin. Formulators later noticed its ability to curb the growth of unwanted microbes in personal care products, so it gradually moved into the cosmetic world as a helper preservative.
Manufacturing starts with a Diels-Alder reaction that builds the bicycloheptene ring system, followed by careful addition of the ethylhexyl group and formation of the twin imide rings. Each step is carried out under controlled temperature and pressure, then the ingredient is purified and quality tested to meet cosmetic grade standards.
Today you can find Ethylhexylbicycloheptene Dicarboximide in oil based serums, sunscreens, anti-aging creams, balms and some wash-off masks. It is usually present at low levels, working behind the scenes to keep formulas fresh without altering texture or scent.
Ethylhexylbicycloheptene Dicarboximide’s Cosmetic Benefits/Uses
This ingredient’s main role in beauty products is antimicrobial protection. By slowing the growth of bacteria, mold and yeast it helps extend a product’s shelf life and keeps the formula safe to use. Because it is oil soluble it works especially well in rich creams and sunscreens where water based preservatives struggle.
Who Can Use Ethylhexylbicycloheptene Dicarboximide
Because it is used at very low concentrations and does not add oiliness or dryness, this preservative is generally considered suitable for all skin types including dry, oily, combination and sensitive. The molecule is lightweight and non occlusive so it will not clog pores or leave a heavy film that might bother acne-prone skin. There are no specific skin types that need to avoid it, though anyone with a known sensitivity to imide or norbornene derivatives should exercise caution.
Ethylhexylbicycloheptene Dicarboximide is synthetically produced without animal-derived raw materials, making it appropriate for both vegans and vegetarians. It is not tested on animals by most reputable suppliers that follow modern cosmetic regulations, though checking brand policy is always wise for those following cruelty-free guidelines.
No published data suggest that the ingredient poses a particular risk during pregnancy or while breastfeeding. Still, this is not medical advice and women who are pregnant or nursing should discuss any skincare routine with a qualified healthcare professional before use.
The compound itself is not known to cause photosensitivity, so it will not make skin more prone to sunburn. It also has no recorded interaction with common actives such as retinoids, vitamin C or alpha hydroxy acids, allowing it to sit comfortably in multi-step routines.
Potential Side Effects/Adverse Reactions
Individual responses to topical Ethylhexylbicycloheptene Dicarboximide can vary. The points below describe potential side effects that have been reported, yet most people will not encounter them when the ingredient is used at the low levels found in finished products.
- Mild skin irritation such as itching or stinging
- Transient redness, especially on very sensitive or compromised skin
- Contact dermatitis in those allergic to imide structures
- Eye irritation if the product accidentally gets into the eyes
- Rare cross-reaction with other repellents or pesticides applied simultaneously
If any discomfort or visible reaction occurs, discontinue use immediately and seek professional medical advice if symptoms persist or worsen.
Comedogenic Rating
Rating: 1 out of 5. Ethylhexylbicycloheptene Dicarboximide is a light, non-occlusive liquid used at very low levels so it sits on the skin without forming a thick film that could trap oil or debris in pores. Its main job is microbial control, not emolliency, which keeps its pore-clogging potential minimal.
Because of this low rating it is generally suitable for acne-prone or breakout-prone skin.
Like most preservatives the final formula matters more than the single ingredient. A rich balm loaded with heavy butters may still feel comedogenic even if this preservative alone is not.
Summary
Ethylhexylbicycloheptene Dicarboximide is chiefly valued as an antimicrobial helper that slows the growth of bacteria, mold and yeast so cosmetics stay fresh and safe longer. Its oil-soluble nature lets it patrol the creamy or oily parts of a formula where water-based preservatives struggle, giving broader protection with only tiny amounts.
While once better known in insect repellents it now shows up quietly in sunscreens, serums and balms. It is not a headline active so its popularity is modest, yet formulators appreciate the extra layer of preservation it offers without altering texture or scent.
Safety data rate it as low risk at the concentrations used in skincare. Most users tolerate it well but everyone’s skin is unique so it is smart to patch test any new product that contains it.