The short answer: if baking soda deodorant leaves you red, itchy or raw, look for one that controls odor with magnesium hydroxide or zinc ricinoleate instead, ideally both, with an unscented option and a short ingredient list.
Why baking soda bothers so many people
Healthy skin is mildly acidic. Baking soda is strongly alkaline. Rubbed into thin underarm skin every day, it can wear down the skin's barrier. The result for some people is redness, stinging, a rash or darkened patches, often weeks after they start.
What to look for instead
| Ingredient | What it does | Good to know |
|---|---|---|
| Magnesium hydroxide | Neutralizes odor acids | Gentler than baking soda because it barely dissolves |
| Zinc ricinoleate | Traps odor molecules | Made from castor oil; less common, worth seeking out |
| Arrowroot, tapioca or kaolin | Absorb moisture | Help you feel drier; they don't stop sweat |
| Magnesium carbonate | Neutralizes odor | Milder than baking soda, but still alkaline |
What to check on the label
- Baking soda by any name: sodium bicarbonate. Check the whole list; some "sensitive" sticks still include a little.
- Fragrance: "fragrance" or "parfum" is a common cause of reactions. Choose unscented, or a brand that lists every essential oil.
- Alcohol and acids: they can sting on freshly shaved skin.
- Short list: fewer ingredients means fewer things to react to and an easier time finding the culprit if you do.
How to switch without irritation
- Patch test on your inner arm for 24 hours.
- Apply to clean, dry skin, never right after shaving.
- Two or three light swipes. More product means more to react to.
- Give it a week or two. You'll notice sweat if you're coming off antiperspirant; that's normal.
How ours fits
We make a tallow deodorant by hand in College Station, Texas, that uses both magnesium hydroxide and zinc ricinoleate, with no baking soda, aluminum, alcohol or synthetic fragrance. It comes in nine essential-oil scents or Bare, with none. Read how it works, or try a $6 mini first.
No deodorant suits everyone. If a rash doesn't clear after you stop a product, see a doctor.
Carolyn Rosser, founder