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BO-Fighting AHA Serum
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Your pits need an AHA moment
A clean stain-free serum deodorant with a unique blend of AHAs for the ultimate BO-fighting treatment. Bonus points: soothes skin, visibly brightens, and helps with ingrown hairs. No aluminum. No baking soda. Only pit-nourishing ingredients allowed.
- Shikimic Acid
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Natural deodorizer
- Mandelic Acid
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Helps address dullness and discoloration
- Lactic Acid
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Exfoliates and holds in moisture
- Pure Aloe Vera Juice
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Moisturizes + soothes
- Hyaluronic Acid
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Hydrates, softens + smoothes skin
- Highly Bioactive Peptide
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skin-conditioning + firming
Aqua, Aloe Barbadensis Leaf Juice, Glycerin, Mandelic Acid, Polyglyceryl-4 Cocoate, Sodium Hydroxide, Shikimic Acid, Lactic Acid, Palmitoyl Tripeptide-5, Hyaluronic Acid, Citric Acid, Tartaric Acid, Xanthan Gum, Potassium Sorbate, Sodium Benzoate, Cananga Odorata Flower (Ylang Ylang) Oil, Citrus Aurantium Amara (Bitter Orange) Flower Oil, Citrus Paradisi Peel Oil, Simmondsia Chinensis Seed (Jojoba) Oil, Benzyl Benzoate, Limonene, Linalool
Size: 70 ml/ 2.4 fl oz
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Use it everyday - just shake, roll, and go. Gently squeeze for more serum.
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Maximum benefits kick in after one week of use.
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Pair it with super hydrating Lipfuel, also made for the made-for-action Kosasport collection.
97% of consumers said the product made them feel fresh
94% of consumers said their body odor was neutralized
92% of consumers said the product lasted through workouts
*based on a consumer study of 33 women after 1 day of use
Clinically Tested. Allergy Tested.
Non-irritating. Safe for sensitive skin.
TotalBeauty Awards (2022)
Into the Gloss Top 25 list (2022)
Into the Gloss Top 25 list (2021)
ELLE Future of Beauty Awards (2020)
Refinery29 Beauty Innovator Awards (2020)
Pairs Best With
Different Approach To BO
We want to treat BO where it starts. Our blend of AHAs (Alpha Hydroxy Acids) helps lower the pH in your pit so it’s harder for odor-causing bacteria to live there. Less bacteria = less smell.




Deodorant For Skincare Freaks
The AHA blend also brightens and exfoliates to help prevent uncomfy ingrown hairs. Additional skincare ingredients work to moisturize and soothe the sensitive skin of your pit too.
Clean Deodorant That Isn’t Annoying
The lightweight serum dries quickly and doesn’t leave a residue or stain on your clothes. The cooling roller ball is also super easy and feels sooo good going on your skin.


Kosas Clean
Vegan, cruelty-free, and gluten-free. Formulated without: aluminum, baking soda, mineral oil, talc, silicones, fragrance, parabens, sulfates, and phthalates.
Check out our Kosas Clean page for the full list.


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- CCynthiaVerified ReviewerAge Range 45 - 54Astrology Fire — Aries; Leo; SagittariusHair Color BlondSkin Tone LightSkin Type NormalRecommend Yes -1000%5 days agoAge Range 45 - 54Astrology Fire — Aries; Leo; SagittariusHair Color BlondSkin Tone LightSkin Type NormalRecommend Yes -1000%Rated 5 out of 5 starsThe only deodorant that works all day!!
I'm a dental hygienist, so I work all day with my armpits very close to people's faces. This is the only deodorant that works for me all day long, even through stress sweat! Natural deodorants worked well for me for decades, but then I got into perimenopause and they weren't enough. I'd have to reapply at lunch time and I'd still be concerned about smelling. One other popular (and odd smelling) chemistry deodorant worked well for 2 months, then just stopped. I've used this deodorant only for over 2 years now and it never lets me down. It also doesn't give me a rash and doesn't leave oily stains or white marks on my clothes. The only bummer is that the price keeps creeping up. I can't believe I'm spending almost $20 for deodorant.
Was this helpful? - LHLaura H.Verified BuyerAge Range 45 - 54Astrology Fire — Aries; Leo; SagittariusHair Color RedSkin Tone FairSkin Type OilyRecommend Yes -1000%1 week agoAge Range 45 - 54Astrology Fire — Aries; Leo; SagittariusHair Color RedSkin Tone FairSkin Type OilyRecommend Yes -1000%Rated 5 out of 5 starsHands up! The BEST DEODORANT EVER.
I am the stinky kid. About 15 yrs ago I stopped using anti-perspirant, b/c it was staining my armpits and causing all kinds of rashes and irritation. Since then it's been a fight to find something that works consistently to eliminate odor, even when I sweat hard, and to last a whole day. Chemistry Deodorant WORKS. It has further "lightened" my pits, no itching, no irritation. I don't even worry when I shave my armpits now :)
Was this helpful?KCKosas Cosmetics1 week agoHi Laura! We love to hear this! So happy Chemistry has helped 💚
- AMAlexis M.Verified BuyerAge Range 25 - 34Astrology Air — Gemini; Libra; AquariusHair Color BrownSkin Tone FairSkin Type CombinationRecommend Yes -1000%1 week agoAge Range 25 - 34Astrology Air — Gemini; Libra; AquariusHair Color BrownSkin Tone FairSkin Type CombinationRecommend Yes -1000%Rated 5 out of 5 starsYou have to try this deodorant!
I have been using natural deodorant for years and nothing ever really worked for me. I’m so glad I gave this deodorant a try because it really works! I have sensitive skin and had no issues with it. I 100% recommend this product, it is amazing!
Was this helpful? - MCMadai C.Verified BuyerRecommend Yes -1000%3 weeks agoRecommend Yes -1000%Rated 5 out of 5 starsBest product ever
You’ll be able to see the results from the first time. Compare to other product, this is the best I’ve ever had.
Was this helpful? - MGMichelle G.Verified BuyerAge Range 45 - 54Astrology Water — Cancer; Scorpio; PiscesHair Color BlackSkin Tone MediumSkin Type NormalRecommend Yes -1000%1 month agoAge Range 45 - 54Astrology Water — Cancer; Scorpio; PiscesHair Color BlackSkin Tone MediumSkin Type NormalRecommend Yes -1000%Rated 5 out of 5 starsKosas Chemistry Deodorant
Every since I had my daughter antiperspirants quit working. I tried every natural one. Finally found Salt of the earth only one that works. It's in UK so expensive and hard to get. I decided to try Kosas , and they did not disappoint works for days. I'm totally switching.
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