Skincare enthusiasts will be well-versed in the hydrating benefits of hyaluronic acid, the hero ingredient that draws moisture into the skin and can hold up to 1,000 times its own weight in water. But TikTokers are now using the substance on their hair to try and reap similar moisture benefits in dull and dry lengths.

User @katilynroundtree shared the results of her hair after using the stuff on her hair for two weeks. “Saw a TikTok saying oil doesn’t moisturize your hair, only water can. So I tried hyaluronic acid!” she captioned the video with the mind blown emoji.

Before using her HA serum, Katilyn’s lengths were visibly brittle and a little straw-like. She applied The Ordinary Hyaluronic Acid Serum, £5.95 here, to wet hair every night for two weeks, with her hair already noticeably more shiny after the first day.

“After 2 weeks this is how my hair looks! It feels so soft and is way more manageable,” she wrote alongside a clip of the dazzling results. Unsurprisingly, the video has racked up 311,000 likes and counting and inspired many similar TikToks.

So is hyaluronic acid for hair something we should all be doing, or just another “too good to be true” trend?

Although experts say it doesn’t have the ability to reverse hair damage, as a mega moisturising ingredient it can improve your strands’ hydration levels.

Cult affordable brand The INKEY List has a treatment that’s specifically for your hair, £10 here, so clearly there’s something in this phenomenon.

"Like skincare and the skin barrier, a lack of hydration means the hair follicle will be rough and accelerate moisture loss,” explains the brand’s co-founder Mark Curry. “Therefore, alongside frizz and lustre, the hair will become naturally weaker and prone to breakages plus look more lank and lifeless. So adding HA into your haircare routine [can help combat this].”

“Our mix of small and large molecules of hyaluronic acid in the Hyaluronic Acid Hair Treatment both penetrate and line the outside of the hair follicle ensuring that the hair is hydrated, nourished and smooth,” he continues. “This means your hair has no fizz and maintains a smooth, healthy-looking finish.”

However, if you want to keep up the shiny and smooth effects of HA on the hair, you’ll need to use it consistently. This isn’t a “quick fix and you’re done” scenario.

“Remember your hair is dead, so you are not encouraging it to be doing anything different, but you are maintaining its state to give a specific look and feel,” Mark stresses. “Your hair follicle will only look and feel as good as how you treat it everyday.”

It looks like TikTokers were on to something this time!

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