Every natural deodorant is secretly answering one question: what neutralizes the odor? And for most of the category, the answer comes down to two ingredients — baking soda and magnesium. They get pitted against each other like rivals. The truth is more interesting.
Baking soda: the veteran
Sodium bicarbonate has been fighting odor since before deodorant was a product category — it's the box in the back of the fridge. In deodorant, it works by raising the pH of the skin's surface, creating an environment where odor-causing bacteria can't thrive. It's effective. Decades of armpits can attest.
The catch is the same mechanism that makes it work. That alkalinity is strong — and for some people, daily use leaves the underarms irritated, itchy, or red. It's not universal, but it's common enough that "baking soda sensitivity" is a known thing in the natural deodorant world. Power with a price.
Magnesium: the diplomat
Magnesium hydroxide neutralizes odor the same fundamental way — by shifting the pH where bacteria do their business — but far more gently. It's less alkaline than baking soda, which means it tends to be kinder to skin while still holding up through a normal day.
This is why we built INNERSLF around it. Magnesium hydroxide is the core of our formula: odor control that works with your body instead of shouting over it. Arrowroot absorbs moisture, coconut oil and aloe care for the skin, and the magnesium does the quiet work of keeping odor from starting.
The honest part
Here's what most brands won't say: our formula contains both. Sodium bicarbonate is in there too, in a supporting role — because at the right level, it's a superb odor neutralizer. We're not baking-soda-free and we don't claim to be. We're baking-soda-considered: magnesium leads, baking soda supports, and the balance is tuned so the formula performs without punishing your skin.
Anyone selling you "baking soda is poison" or "magnesium is a gimmick" is selling you something. The chemistry is more nuanced than the marketing.
Which should you choose?
If your skin is unbothered by everything — if you've never reacted to a deodorant in your life — a baking-soda-forward formula will serve you well. It's the workhorse. Respect it.
If you've ever itched, reddened, or protested — if a "natural" stick once staged a revolt under your arms — magnesium-led formulas are your lane. That's the exact person we formulated for.
If you want both — the reliability of baking soda with the manners of magnesium — that's the balance we spent our formulation energy on. Not the loudest ingredient winning, but the right ones in the right roles.
The takeaway
Baking soda vs. magnesium was never really a fight. It's a spectrum — and the best formulas don't pick a side, they compose. Power where you need it, gentleness where you feel it, and the honesty to tell you exactly what's inside.
Check the label. Then trust the ritual.
