People Swear By This Skin Care Ingredient As Natural Deodorant, But Does It Work?

Here's an understatement: It is so, so hard to find a natural deodorant you adore. Not only does the switch to natural come with an adjustment period of sorts, where your microbiome adjusts to its new state, but it's difficult to pinpoint your favorite formula and fragrance among all the new options out there. Take it from someone who has tested her fair share of sticks, serums, crystals, you name it: The journey to natural deo is not for the faint of heart. 

Totally! In fact, acid-based formulas are booming in the natural deodorant sphere for their pH-balancing properties. See, traditional deodorants already fall on the acidic side, so they can lower your skin's pH and make it too acidic for odor-causing bacteria to thrive1. An alpha-hydroxy acid (like glycolic acid) can do the same, along with some added benefits: The chemical exfoliator can also slough off dead skin and help prevent ingrowns, leaving your pits smooth and bump-free. 

Plus, as board-certified dermatologist Lindsey Zubritsky, M.D., explains in a duet video, the AHA could also help with hyperpigmentation on the armpit skin—glycolic acid is beloved for reducing the appearance of acne scars, photodamage, and discoloration, so it makes sense why you might see similar success in the underarm area. 

To apply, this TikTok user recommends pouring the solution (she uses the Glycolic Acid 7% Toning Solution from The Ordinary) into a spray bottle to use as a spritz-on deodorant. Or, as Zubritsky notes, you can also saturate a reusable cotton pad and simply swipe on the serum. Let your pits air-dry for a few moments, and head out into the summer heat. 

So yes, the TikTok trend has legs, but it's not without its drawbacks. If slathering an AHA all over your sensitive armpit skin sounds like a recipe for irritation, well, that's because it is—at least for some. 

Glycolic acid has the smallest molecular weight of all the alpha-hydroxy acids, which means it can penetrate more easily into the skin. That's why some people may find the acid way too harsh for their liking: "Very sensitive skin may find glycolic acid irritating," board-certified dermatologist Hadley King, M.D., told us about the ingredient. 

Even if you can usually tolerate the AHA, know that your armpit skin may be more sensitive than the skin on your face. "If you overuse it, especially in your armpits, you can get massive irritation," says dermatologist Camille Howard-Verovic, D.O., founder of Girl+Hair, in another duet video. "I would take extreme caution when listening to this piece of advice." You may be better off finding an acid-based deodorant formulated with gentler exfoliants (like the lactic acid in this Kosas number), or as Zubrinsky notes: "Start low and slow!"