# Kosas Chemistry AHA Serum Deodorant, Fragrance Free

> AHA-based deodorant that uses mandelic acid to lower underarm pH and prevent odor-causing bacteria. No aluminum, no baking soda, no synthetic fragrance.

- Brand: [Kosas](https://nontoxicnook.com/brands/kosas)
- Price tier: $
- Canonical: https://nontoxicnook.com/products/kosas-chemistry-aha-deodorant-fragrance-free

## Why we chose it

Kosas takes a skincare-first approach: the active ingredient is mandelic acid (an AHA), which lowers underarm pH to inhibit odor-causing bacteria without baking soda or aluminum. The fragrance-free variant has no scenting agents at all. The full ingredient list is published on the brand site and reads like a serum, not a traditional deodorant.

## Specs

- material: Mandelic acid (AHA), niacinamide, shea butter, vitamin E
- format: Serum stick, 2.1 oz
- scent: Fragrance free
- image:source-url: https://kosas.com/products/chemistry-deodorant
- image:credit: Kosas, used with permission
- source:ingredients: https://kosas.com/products/chemistry-deodorant

## Where to buy

- [Amazon](https://www.amazon.com/dp/B0927XMY4M)
- [Kosas](https://kosas.com/products/chemistry-deodorant)

Prices are deliberately omitted from this mirror — they go stale. Current prices and stock: https://nontoxicnook.com/products/kosas-chemistry-aha-deodorant-fragrance-free

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Nontoxic Nook lists only products that cleared the published criteria at https://nontoxicnook.com/our-promise. Affiliate disclosure: https://nontoxicnook.com/affiliate-disclosure.