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This Popular Serum Ingredient Is A Hair Care Hero — It Can Save Your Dry Locks

September 10, 2021
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At this point, plenty of skin care ingredients have made a splash in the hair care department (AHAs in shampoos, ceramides in hair growth serums, and the list goes on). But using a proper skin care serum on your hair? Now, that sounds iffy, if not wasteful. Who wants to give up precious product if it's not going to have the same benefits for your strands? 

Well, don't knock it till you try it—or check out this TikTok user who already did. In the viral video (it currently has one million views and counting), she repurposes a cult-favorite serum and rakes it through the lengths of her hair. "After only two days, I saw and felt a major difference," she explains. And after a full, two-week experiment, her hair "feels so soft and is way more manageable." What's this secret ingredient, you wonder? Oh, it's hyaluronic acid. 

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Yes, the hero ingredient responsible for your dew can be just as transformative for your tresses. Bouncy skin and lush hair, below. 

Hyaluronic acid serum for hair: How does it work? 

Hyaluronic acid is a humectant, meaning it has the ability to attract water to the surface of the skin and hair, as well as deliver hydration to the deeper layers. (And in case you haven't heard: Hyaluronic acid can hold 1,000 times its own weight in water1.) Chances are you rely on other humectants in hair care—ever tried a honey hair mask?—so consider hyaluronic acid another top choice to ramp up hydration. 

In fact, plenty of leave-ins, shampoos, and stylers include the ingredient in their formulas already—hyaluronic acid for hair is not a new concept. But from this TikTok experiment, it seems using a proper skin care serum can be just as effective, if you can spare a few drops. 

"HA lives in my shower for the face and hair," says board-certified internal medicine physician and skin care expert Zion Ko Lamm, M.D., in a duet video. If you have dry, frizzy, brittle, or damaged locks, she considers it a worthy addition to your routine (she typically uses it as a pre-shampoo or leave-in treatment). Best part? Like Lamm, you can streamline your routine and keep one vial on hand for your skin and hair—both will drink the HA right up. 

The only caveat to note is that hyaluronic acid doesn't exactly seal moisture into the strand. It helps draw in moisture from the environment, yes, but as Lamm says: "It does not take the place of hair oils." You'll still want to lock in all that water with an occlusive product, or the precious hydration can seep out, and your hair may become even more limp and dry than before. 

How to apply. 

In the video, you'll see that the user applies her serum on damp hair as a leave-in treatment. A solid idea, considering hyaluronic acid pulls in water from the environment; so if you don't provide the water, HA will still do its job—it might just pull water from your hair shaft instead of the surrounding air, which can leave it straw-like. She uses The Ordinary's Hyaluronic Acid 2% + B5 (the added panthenol is extra moisturizing), but here are 15 more hyaluronic acid serums to browse—we adore them all. 

As we mentioned above, don't forget to follow up with a hair oil, then feel free to style as usual. (And if you're partial to an air-dry, check out our handy guide.) Repeat every wash day, if you please, and notice how your hair changes: As the HA plumps the strand with moisture, your hair should appear oh-so-soft and shiny. 

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The takeaway. 

Hyaluronic acid for hair: not a new concept, but a single-ingredient serum can add some much-needed hydration to the strands. If you haven't yet dabbled in the power of humectants for hair, you may even find the results transformative. 

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