100% Saw Longer, Thicker, Lusher Lashes
Get max volume and separation with the cleanest ingredients. Biodegradable plant-based sugars replace traditionally used microplastics for a longwearing formula + big, fluffy, lash-extension impact.
Big Lash Energy
Natural body-building ingredients and pure, intense pigments deliver a big lash vibe. The oversized curved brush (like a rainbow) has flexible-yet-firm spiraled bristles that volumize, lengthen, separate, and curl lashes all the way up.
Powerful Hair Care Serum For Clinically Proven Results
The active formula nourishes and protects to support stronger, healthier lashes over time. Every swipe helps lash hairs reach their full growth potential.
See It In Action
A few before & afters of The Big Clean. Your lashes, but bigger.
Cruelty-free and gluten-free. Formulated without: carbon black, acrylates, mineral oil, talc, silicones, fragrance, parabens, sulfates, and phthalates.
Check out our Kosas Clean page for the full list.
Clinically Proven Results
87% did not experience smudging
Long wearing for 12 hours
After 2 weeks:
100% saw longer, thicker, lusher lashes*
*Based on a consumer study with 33 women after using The Big Clean for 2 weeks
Clinically tested. Ophthalmology tested.
Safe for sensitive eyes. Non-irritating. Hypoallergenic.
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- MMagicalgurlAstrology Air — Gemini; Libra; AquariusSkin Type Dry1 week agoAstrology Air — Gemini; Libra; AquariusSkin Type DryRated 5 starsBest Lash Care Mascara
I love the finished look of this mascara. It gives my lashes a more extended appearance and makes them look full-bodied.
The Kosas Big Clean Mascara has been the only mascara I have used for over a year, and I wear it daily. As a result, my lashes are healthier after using this mascara. In addition, it doesn't flake or irritate my sensitive eyes.
I hope Kosas will continue to make this clean + lash care mascara and never change the formula because it is perfect.Was this helpful?
- PMPaula M.Verified BuyerAstrology Fire — Aries; Leo; SagittariusSkin Type Combination1 week agoAstrology Fire — Aries; Leo; SagittariusSkin Type CombinationRated 5 starsI really like this mascara.
I really like this mascara. My lashes are very straight and this helps keep them in place after using my lash curler and lash primer.Was this helpful?
- TMTracy M.Verified BuyerAstrology Air — Gemini; Libra; AquariusSkin Type Dry2 weeks agoAstrology Air — Gemini; Libra; AquariusSkin Type DryRated 4 starsLove the application and length
Love the application and length I got but it transferredWas this helpful?
- ABAnya B.Skin Type Combination1 month agoSkin Type CombinationRated 2 starsNot the best
I love the brand Kosas. I have a lot of their products and have been buying from Kosas since 2017. The mascara really surprised me but not in a good way. Sure, it creates a lot of volume but it’s really messy and clumpy volume. Also, I like when my mascara washes off easily so I’m not damaging my own eyelashes and pulling them out. This mascara is REALLY hard to wash off and even with make up remover it still doesn’t come off well. Because of that I can’t use this. Hopefully a new formula is in the works because I see this product has an average rating of 3.5 which seems really bad for a brand (or for any brand) like Kosas.Was this helpful?
- KKcAstrology Water — Cancer; Scorpio; PiscesSkin Type Combination1 month agoAstrology Water — Cancer; Scorpio; PiscesSkin Type CombinationRated 5 starsThe best clean mascara
I’m a mascara junkie and this is by far my favorite clean mascara. Trust me I’ve tried them all. This is just effortless perfection. No I didn’t get this for free. I’ve actually spent money on this product again and again.Was this helpful?