Overview
What it is
Lip plumper with 23 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
AntioxidantPentaerythrityl Tetraisostearate
EmollientVanillyl Butyl Ether
MaskingCanola Oil
EmollientCapsicum Frutescens Fruit Extract
Skin ConditioningZingiber Officinale Root Oil
MaskingMenthol
MaskingVanillin
MaskingParfum
MaskingCI 19140
Cosmetic ColorantCI 42090
Cosmetic ColorantCI 45410
Cosmetic ColorantIron Oxides
Polybutene, 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, Pentaerythrityl Tetraisostearate, Vanillyl Butyl Ether, Canola Oil, Capsicum Frutescens Fruit Extract, Zingiber Officinale Root Oil, Menthol, Vanillin, Parfum
May Contain:
CI 19140, CI 42090, CI 45410, Iron Oxides
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 created from stearic acid.
It is an emollient and thickens the lipid (oil) portion of a product. Due to its emollient properties, it may not be fungal-acne safe.
Tridecyl 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 comes from the palmitic acid ester of Dextrin. It is used as an emulsifier and texture enhancer.
Emulsifiers help keep ingredients together. According to a manufacturer, dextrin palmitate helps create a low-viscosity gel texture.
Due to its fatty acid base, this ingredient is not 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.
Sunflower seed oil unsaponifiables comes from the the small part of sunflower seed oil that does not convert into soap during the saponification process.
This ingredient is rich in vitamin E, fatty acids (like linoleic acid), and other lipophilic compounds, making it a great emollient. Emollients help keep the skin hydrated and soft.
Due to its rich fatty acid content, this ingredient may not be Malassezia folliculitis safe.
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 HydroxyhydrocinnamatePentaerythrityl Tetraisostearate is derived from isostearic acid. It is an emollient and emulsifier.
The highest concentration of this ingredient is found in lipsticks.
This ingredient is minimally water soluble and may not be Malassezia folliculitis, or fungal-acne safe.
Learn more about Pentaerythrityl TetraisostearateWe don't have a description for Vanillyl Butyl Ether yet.
Canola Oil is Rapeseed oil with low amounts of erucic acid. It is an emollient and helps hydrate the skin. Emollients help hydrate and soften your skin by trapping moisture.
The comedogenic rating of canola oil is 4.
Canola oil contains Vitamin E, Vitamin K, and fatty acids such as linoleic 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 āFRAGRANCEā or āPARFUMā 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 ParfumCI 19140 is also known as Tartrazine. Tartrazine is a synthetic dye used in cosmetics, foods, and medicine to add a yellow color.
Tartrazine is created from petroleum and is water-soluble.
Some people may experience allergies from this dye, especially asthmatics and those with an aspirin intolerance.
Learn more about CI 19140Ci 42090 is a synthetic dye created from petroleum. It is used to give a bright blue color to cosmetics, medicine, and food.
CI 45410 is a synthetic red-pigment and dye.
It often goes by both Red 28 or Red 27; manufacturers label both ingredients as CI 45410.
This dye is commonly found in makeup because it imparts a vivid color. Some types of this dye change color based on pH level and interaction with moisture:
Your skin has a natural pH of around 4.5 - 5.5.
According to the FDA, CI 45410 is not permitted for use in eye products.
Red 27 is a flourescein dye and commonly used as a fluorescent tracer in medicine.
Learn more about CI 45410This ingredient is a combination of red, black, and yellow iron oxide pigments. This combination of colors is usually found in foundation, because it results in a "skin" color.
The EU typically uses CI numbers for colorants when applicable, such as CI 77489. In the US, iron oxides are regulated as color additives and "iron oxides" is the most commonly used name in US cosmetic practice.
A 2021 paper looked at skincare formulations containing iron oxides and found that they reduced transmission of blue light when measured optically. In simple terms, the pigment particles helped block or scatter part of the visible light spectrum in lab testing and the authors suggest this could translate into better protection against blue-light-related skin effects.
There is also clinical and experimental research showing that tinted products containing iron oxides can reduce visible light-induced pigmentation:
Please note, whether a product reduces visible or blue light depends on things like:
In the EU's CosIng database, iron oxides are only listed as a colorant. CosIng groups ingredients by their main cosmetic role, such as colorant, preservative, or UV filter.
Though studies say iron oxides can "attenuate blue light", they're describing an optical property and not an officially recognized cosmetic function.
So CosIng isnāt contradicting the research. Itās just classifying iron oxides by what they officially are: pigments that add color.
Learn more about Iron OxidesReviews
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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 usĀ· Updated April 9, 2026 • Added by sarahburton2