Overview
What it is
Lip plumper with 18 ingredients
Cool Features
It is vegan, cruelty-free, and reef safe
Suited For
It has ingredients that are good for sensitive skin
Free From
It doesn't contain any harsh alcohols, parabens, silicones or sulfates
Fun facts
Kosas is from United States.
We independently verify ingredients and our claims are backed by peer-reviewed research. Does this product need an update? Let us know.
What's inside
Ingredients List
Polybutene
Hydrogenated Polyisobutene
EmollientOctyldodecyl Stearoyl Stearate
EmollientTridecyl Trimellitate
EmollientDextrin Palmitate
EmulsifyingDextrin Palmitate/Ethylhexanoate
EmulsifyingMenthyl Nicotinate
HumectantHelianthus Annuus Seed Oil Unsaponifiables
EmollientMenthyl Lactate
MaskingMethyl Nicotinate
SoothingPentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate
AntioxidantVanillyl Butyl Ether
MaskingCanola Oil
EmollientCapsicum Frutescens Fruit Extract
Skin ConditioningZingiber Officinale Root Oil
MaskingMenthol
MaskingVanillin
MaskingParfum
MaskingPolybutene, Hydrogenated Polyisobutene, Octyldodecyl Stearoyl Stearate, Tridecyl Trimellitate, Dextrin Palmitate, Dextrin Palmitate/Ethylhexanoate, Menthyl Nicotinate, Helianthus Annuus Seed Oil Unsaponifiables, Menthyl Lactate, Methyl Nicotinate, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate, Vanillyl Butyl Ether, Canola Oil, Capsicum Frutescens Fruit Extract, Zingiber Officinale Root Oil, Menthol, Vanillin, Parfum
Key Ingredients
Benefits
Concerns
Ingredients Explained
Polybutene is used to help control the viscosity of a product. This just means it helps adjusts the texture.
It is a polymer and does not get absorbed into the skin due to its large size.
Studies found this ingredient did not irritate skin in concentrations below 15%.
Learn more about PolybuteneHydrogenated Polyisobutene is a synthetic polymer. Polymers are compounds with high molecular weight. Hydrogenated Polyisobutene is an emollient and texture enhancer.
In one study, Hydrogenated Polyisobutene showed better skin hydration levels than Caprylic/Capric Triglyceride. As an emollient, it helps keep your skin soft and hydrated by trapping moisture in.
Hydrogenated Polyisobutene is often used as a mineral oil replacement.
Learn more about Hydrogenated PolyisobuteneOctyldodecyl Stearoyl Stearate is an emollient ester that mostly shows up in color cosmetics.
Functionally, it works as a skin-conditioning agent and a viscosity-increasing agent. This just means it helps soften skin while also thickening water-free formulas (like powders).
Despite being a "stearate", it has a lightweight, cushiony, and non-greasy slip.
This ingredient has shown no adverse effects in testing and is deemed safe in cosmetics at current use levels.
Typical concentrations range from 0.7-23%.
Because it is made of C-18 fatty acids (like stearic acid), this ingredient may not be fungal acne safe.
Learn more about Octyldodecyl Stearoyl StearateTridecyl Trimellitate is a synthetic ingredient with emollient and skin conditioning properties. It also acts as a texture enhancer and helps products spread easily without feeling greasy.
As an emollient, it forms a light layer on the skin that keeps moisture in and improves water resistance. This is why you'll often find this ingredient in eye creams and other rich treatments.
This ingredient is seen as the elegant alternative to mineral oil.
Learn more about Tridecyl TrimellitateDextrin Palmitate is an oil-loving texture helper made by bonding palmitic acid onto Dextrin. It's main roles are to turn liquid oils into spreadable gels and prevent ingredients from separating.
It also lends a silky, non-greasy slip that makes products feel more elegant.
Typical use concentrations range from 0.5-5%, but can go up to 10% depending on how firm the gel is.
Because it's an ester built on a fatty acid, it may not be fungal acne safe.
Learn more about Dextrin PalmitateThis ingredient is an emulsifier. It helps enhance the texture and stability of formulas.
The only manufacturer of this ingredient is in Japan. According to them, this ingredient reduces the tackiness and greasiness of products.
Dextrin Palmitate/Ethylhexanoate is created by reacting dextrin with a mixture of palmitoyl chloride and hexyldecanoic acid chloride.
Learn more about Dextrin Palmitate/EthylhexanoateWe don't have a description for Menthyl Nicotinate yet.
This ingredient is the small fraction of sunflower seed oil (~1.5-2% of the whole oil) that cannot be turned into soap.
This concentrated fraction is rich in skin-nourishing compounds like free fatty acids, tocopherols, and phytosterols. Linoleic acid makes up about 48-74% of its composition.
Unsaponifiables have high antioxidant potential due to the tocopherols, carotenoids, and phenolic acids that help protect skin from free radical damage. On the other hand, linoleic acid supports the skin's barrier by replenishing ceramides and reducing transepidermal water loss.
A manufacturer-sponsored clinical study found that a cream with 2% of this ingredient increased skin moisturization by 48.6% after 1 hour and 34.2% after 24 hours.
Using this cream twice-daily for 4 weeks showed meaningful improvement in dryness, roughness, and desquamation (the shedding of dead skin cells).
Keep in mind this is a small, industry-funded study so it'd be great to see independent replication. However, the mechanism is consistent with well-establish linoleic and phytosterol research.
While this ingredient is generally considered safe, those with an Asteraceae/Compositae plant allergy should patch test this ingredient.
Fungal acne: this ingredient is not considered safe for fungal acne because the Malassezia yeast preferentially metabolizes in the C11-24 range. Linoleic acid falls into this range at C18.
Learn more about Helianthus Annuus Seed Oil UnsaponifiablesMenthyl lactate is an ester of menthol and lactic acid. It is often used as a cooling agent and fragrance.
When applied topically, this ingredient leaves a refreshing sensation like menthol, but is less irritating.
We don't have a description for Methyl Nicotinate yet.
Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate (long name, huh?) is a synthetic antioxidant.
It is used to help stabilize other antioxidants or prevent the color from changing in a product.
As an antioxidant, it helps fight free-radical molecules. Free-radical molecules are capable of damaging our cells and other genetic material. Thus, antioxidants may reduce the signs of aging.
This ingredient is oil-soluble.
Learn more about Pentaerythrityl Tetra-Di-T-Butyl HydroxyhydrocinnamateWe don't have a description for Vanillyl Butyl Ether yet.
Canola Oil is a plant-oil and low-erucic-acid variety of rapeseed. Like other seed oils, it functions as an emollient that softens skin and slows water loss.
Its fatty acid profile is mostly linoleic acid (55-65%) with some oleic, palmitic, and stearic acids. There are also some small amounts of vitamin E and plant sterols.
The sterol content is pretty interesting:
In a controlled human study, a single application of canola oil and especially its sterol-enriched fraction reduced visible irritation, redness, and water loss caused by SLS. Plain canola oil and most other tested oils did little on healthy, un-irritated skin.
It's pretty much just a calm, moisturizing oil that helps with soothing if your skin is already irritated.
Since canola oil is made up of C18 fatty acids, it may not be fungal acne safe. The Malassezia yeast feeds on chain lengths C11-24.
Fun fact: Canadian growers bred the low-erucic variety in the 1970's, and the name stands for "Canadian oil, Low Acid").
Learn more about Canola OilCapsicum Frutescens is a type of wild chili pepper. Some varieties of this pepper include Tabasco pepper, Malagueta pepper, and Piri Piri pepper.
Though this ingredient is normally associated with food, it has antidandruff, antifungal, antimicrobial, and antioxidant properties.
Studies show low concentrations of this ingredient did not cause skin irritation:
Raw peppers may have a rubefacient effect, or mild local skin irritation resulting in vasodilation. Vasodilation is the widening of blood vessels. Due to this, peppers can provide a lip plumping effect. However, it is most likely not going to have a rubefacient effect, or cause skin irritation, in your cosmetics.
The antioxidant activity comes from its flavonoid, polyphenol, and sterol content.
This ingredient is water-soluble.
Learn more about Capsicum Frutescens Fruit ExtractZingiber Officinale is more commonly known as ginger.
Studies show the ginger root has antioxidant, anti-inflammation, and antimicrobial properties.
The antioxidant properties help protect your body from free-radicals. Free-radicals are molecules that may damage your skin cells. As a result, ginger may help slow down signs of aging such as hyperpigmentation and wrinkles.
Ginger originates from Southeast Asia but has spread throughout the world. It is now a common spice used in many cultures.
Learn more about Zingiber Officinale Root OilMenthol is a compound found in mint plants, such as peppermint. In its pure form, it is a clear crystalline substance.
Menthol is known for its cooling sensation; however, the cooling is actually from your skin being sensitized. Menthol can worsen rosacea. We recommend speaking with a professional if you have concerns.
Menthol also has antimicrobial properties.
Learn more about MentholVanillin is the main compound of the vanilla bean. It is naturally occuring but can also be artificially created.
This ingredient exhibits antioxidant properties but is also a known skin-irritant.
Vanillism is the term of contact-dermatitis associated with the vanilla plant. The sap of the vanilla plant triggers skin irritation, swelling, and redness.
Learn more about VanillinParfum is a catch-all term for an ingredient or more that is used to give a scent to products.
Also called "fragrance", this ingredient can be a blend of hundreds of chemicals or plant oils. This means every product with "fragrance" or "parfum" in the ingredients list is a different mixture.
For instance, Habanolide is a proprietary trade name for a specific aroma chemical. When used as a fragrance ingredient in cosmetics, most aroma chemicals fall under the broad labeling category of “FRAGRANCE” or “PARFUM” according to EU and US regulations.
The term 'parfum' or 'fragrance' is not regulated in many countries. In many cases, it is up to the brand to define this term.
For instance, many brands choose to label themselves as "fragrance-free" because they are not using synthetic fragrances. However, their products may still contain ingredients such as essential oils that are considered a fragrance by INCI standards.
One example is Calendula flower extract. Calendula is an essential oil that still imparts a scent or 'fragrance'.
Depending on the blend, the ingredients in the mixture can cause allergies and sensitivities on the skin. Some ingredients that are known EU allergens include linalool and citronellol.
Parfum can also be used to mask or cover an unpleasant scent.
The bottom line is: not all fragrances/parfum/ingredients are created equally. If you are worried about fragrances, we recommend taking a closer look at an ingredient. And of course, we always recommend speaking with a professional.
Learn more about ParfumReviews
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Where it's from
Kosas is a American brand
We're dedicated to providing you with the most up-to-date and science-backed ingredient info out there.
The data we've presented on this page has been verified by a member of the SkinSort Team.
Read more about us· Updated April 9, 2026 • Added by sarahburton2