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Plump + Juicy Lip Booster Buttery Treatment

A buttery treatment packed with concentrated fatty acids and lip-boosting actives for your smoothest, most cushiony lips ever.

15 g

Why you'll love it

  • Visibly reduces the look of fine lines for a soft, cushiony pout
  • Smooth, buttery texture feels like a dream — never sticky or waxy
  • Restores lips and promotes moisture retention

About this brand

Kosas quite simply takes our breath away. It’s a gold standard for luxe, hydrating, better-for-you ingredients combined with a sense of color and beauty that only an artist could dream up.

Sheena Yaitanes, a painter who studied biology, chemistry, and art history, founded this exquisite brand (pronounced ko-shas) in 2015. She uses a color-mixing technique favored by master artists to create what she describes as “elevated color cosmetics.” Her painting background guides what pigments to use and how to match skin tones to the right products.

  • Luscious products, especially lipsticks and blushes
  • Shades picked artfully to match either warm or cool skin tones
  • Designed for women on-the-go – can be applied in the back of a Lyft
  • Free of parabens, phthalates, BHA/BHT, mineral oil, propylene glycol, polyethylene glycol, phenoxyethanol, fragrance, petrolatum, vitamin A, retinoids, and retinoid derivatives
  • Name “Kosas” reflects the five interconnected layers, or “kosas,” of the self: the physical, energetic, mental, intellectual, and soul
  • Based in Los Angeles, California

From Kosas:

“We source ingredients for two reasons: extreme nourishment and supreme luxury. We choose only the ones that deliver both.”

All Kosas products are:

  • Gluten-, egg-, nut-, and soy-free
  • Leaping Bunny certified cruelty-free
  • Botanically-rich makeup that acts as skincare too

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Key ingredients


Visibly firm and smooth the appearance of lips

Plump Oléoactif

Plumps and strengthens

Hyaluronic acid

Locks in hydration for a softer pout


Bis-Diglyceryl Polyacyladipate-2, Ricinus Communis (Castor) Seed Oil, Butyrospermum Parkii (Shea) Butter, Polyhydroxystearic Acid, dl-alpha Tocopheryl Nicotinate, Ethylhexyl Palmitate, Simmondsia Chinensis (Jojoba) Seed Oil, Jojoba Esters, Tribehenin, Helianthus Annuus (Sunflower) Seed Wax, Punica Granatum Flower Extract; Butyrospermum Parkii (Shea Butter) Unsaponifiables, Ricinus Communis (Castor) Seed Oil, Octyldodecanol, Acacia Decurrens Flower Wax, Sodium Hyaluronate, Glucomannan, Polyglycerin-3, Sorbitan Isostearate, Trihydroxystearin, Polyglyceryl-3 Diisostearate, Foeniculum Vulgare Fruit Oil, Palmitoyl Tripeptide-1, Helianthus Annuus Seed Oil, Ethylhexylglycerin, Rosmarinus Officinalis Leaf Oil, Vanillin, Citrus Aurantium Dulcis (Orange) Peel Oil, Tocopherol [May Contain (+/-): Titanium Dioxide CI 77891, Red 28 Lake CI 45410]

Allergen info

Formulated without gluten-derived ingredients; may have been produced in a facility that also processes gluten-derived ingredients

How to use

  1. Wear this lip treatment day or night for your smoothest, fullest, most cushiony lips
  2. If layering with lip color, blot excess before applying
How to use Plump + Juicy Lip Booster Buttery Treatment by Kosas
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Free returns

Customer Reviews

Based on 148 reviews
So moisturizing!

I love this stuff! It’s so thin yet moisturizing and it doesn’t have a weird smell. Highly recommend!

Unknown via kosas.com
The best

This is by far my favorite product from Kosas! I have very dry skin and lips. When they say a true hydration, they were not lying! It leaves my lips so hydrated and it feels like my lips are getting a drink of water when I apply it! It smells like orange Julius which makes me thirsty! Because it does have concentrated fatty acids etc, it almost breaks down your lip product if you apply it on top of lipsticks etc. so it’s definitely meant to apply on your bare lips. I would recommend applying this at night for a night treatment and before you apply any other lip product. This is my go to when I have really bad lip days, before a big event. The packaging is also adorable. The color gradient they chose for this product was perfect because of the flavor they chose for it as well. Beautiful product, a must have in your kit!

SSVH via Sephora

My name is Shannon and I am addicted tolip treatments. I have them in my purse, on my bedside table, in my makeup drawer... you get the idea. Therefore, I was more than happy to review the Kosas Plump & Juicy Lip Booster Buttery Lip Buttery Treatment.As a professional makeup artist, I am already very familiar with the brand and their stellar products. I’m happy to report that this Lip Treatment was no exception.I happen to be extremely picky when it comes to the texture of lip products. I’m actually one of those people that prefers a thicker consistency. (For example, lip oils are not my thing.) I was so pleased with the texture of this Kosas product. It feels thick enough to stay put, but not sticky enough to get caught in your hair in a windstorm.Moreover, it instantly feels like a treatment product vs. a lipgloss. It’s kind of a hybrid actually; like a glossy conditioning treatment. Hard to explain, but trust me, it’s awesome.As for the claims that it will turn my lips into ones that rival Angelina Jolie...I’m not sure just yet. I can definitely see an improvement in texture; my lips are smoother, and the lines are less pronounced. I would so far as to say that they do seem a bit fuller, enough that I intend to use this product until it’s empty. I can easily update my review at that time.

GabysWorld101 via Sephora

I am a huge fan of lip balms and treatments. As an esthetician, I find that lip care is just as important as skincare, overall they are all together. I love products that really hydrate the lips, plumps and smoothes. I also love products that contain ingredients that are beneficial to the lips. Kosas is one of the cleanest brands out there and their product really do impress. This product contains concentrated fatty acids and lip boosting actives, it is recommended to use at night, which is my preferred choice. It also works under other lip products if you want to use it during the day but I’d suggest to use it as an overnight treatment to ensure full benefits. If you do use it during the day under other lip products, it is suggested to remove any access product before applying other products on top. Again, I prefer using it at night, I feel like I woke up with plump, smooth lips the next day. The packaging is cute and easy to use. Highly recommend.

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