Thin hair? Who's to tell with these top-rated thickening shampoos (2025)

How often do you think about the water you use to wash your hair? We guess, not often. Turns out, hard water that's filled with heavy metals can have a huge impact to the health of your hair.

Luckily, Hello Klean's Anti-Thinning Hard Water Shampoo is here to take on the job by neutralising these damaging metals that can dry out your hair, while helping to restore hair back to its natural plumpness.

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You may know Revitalash for its iconic lash growth serum, but the brand also has some exceptional working haircare that helps to boost length and volume.

The Thickening Shampoo focuses on the scalp, feeding it with flax protein, ginseng and loquat leaf to create the perfect condition for hair growth. It's then supported by panthenol to increase hydration and therefore a plump result.

For an extra body boost, pair the shampoo with the Volume Enhancing Hair Foam to get those roots sky high.

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Redken's Volume Injection Shampoo does exactly what it says on the tin. The rich formula lathers up well, giving your strands a good cleanse and ridding roots of daily dirt and grime.

As for its volume boosting prowess, it's formulated with filloxane and silicone polymers to bring back shape and body into hair that's looking a little lifeless.

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We all love a bit of hyaluronic acid in our skincare routines, so why not put it on hair too? This shampoo is formulated with the hydrating ingredient – plus a load of others, such as glycerin – to repair damaged ends that have seen one too many heat tools.

Things don't stop there! The formula also contains keratin, a common ingredient used in reparative hair care as it works to heal damaged bonds and to create a smoother appearance.

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We get it, this is a bit of a splurge for a shampoo, but with the XXL volume it injects into limp hair, you'll never have to book in for a blow dry again.

The brand’s signature keratin proteins reduces frizz and creates a smooth result, while also adding major volume to the roots. With a great clarifying formula on your side, stick to this and the shampoo will remove build-up, creating the best environment for new hairs to sprout through.

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You don’t need to spend a fortune to get red carpet-worthy volume – case and point, this shampoo will set you back less than a tenner.

The formula is rich in our fave hydrating ingredient, hyaluronic acid, which helps to promote softer and shinier locks. And because hair is being loaded with hydration, strands will appear thicker, too and flow with a lotta body and bounce.

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BHAs in our skincare may be old news, but in our haircare? Now that's exciting stuff. When used in a shampoo, BHAs can be a game-changer when it comes to getting rid of pesky flakes and dandruff.

Philip Kingsley's Density Thickening Shampoo is packed with BHAs, working to exfoliate dandruff without causing irritation. By creating this optimal environment on your noggin, you're more likely to see growth and overall volume.

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If you and your hair straightener have a close relationship, it's time to pick up bottle of Kevin Murphy's Stimulate Me Wash. With a mix of keratin, mint and amino acids, it does a great job at wakening up lazy follicles to encourage new growth.

Don't be put off that it was initially designed to treat men's hair (the patriarchy *sigh*), but after all, they do know a lot about hair thinning.

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We're well-versed in the benefits of collagen by now. Be it in chocolate, supplement, skincare or powder format, we'll take it. So, we were keen to see if it made any impact on underwhelming strands, too.

The rich lather of this shampoo deeply cleanses, while feeding dehydrated strands with collagen to leave them feeling softer, fuller and more moisturised. Stay loyal to it and over time you may notice less fall out and breakages too.

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