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L'Oreal Serioxyl Thicker Hair Serum

11 reviews
Serioxyl Thicker Hair Serum

The intelligent serum instantly re-densifies hair and leaves it feeling fuller and thicker thanks to its unique formula combination of thickness-boosting ingredients by L'Oréal Advanced Research.

Parent Reviews and Comments

I found the Serioxyl Thicker Hair Serum to have quick results as promised, my hairline appeared fuller after two applications.

The product is simple and easy to use, applying to wet hair after washing is something I loved as it was not time consuming and didn't require me to blow dry my hair beforehand and fit in well with my routine.

Serioxyl Thicker Hair Serum smells lovely, and spread through my hair nicely, it also doesn't leave any sticky residue on your hair or hands. 

The glass bottle also looks great and really stands out against the standard plastic bottles on my shelf.

Unfortunately while I was very impressed with the fast results I had an allergic reaction and couldn't continue to use the Serum. 

I would absolutely reccomend to anyone suffering from thinning hair, give Serioxyl Thicker Hair Serum a try!


In a bid to improve my hair after major post partum hair loss I have been trialling this product. I find this product makes my hair feel denser but also feels full of product. The product feels quite heavy on my otherwise fine hair. Using it every second wash has helped with this. 


I have been using the serum for about a month. i'm not sure it's made a huge difference but my hair does feel thinker. I haven't had any problem using the serum and it doesn't make my hair feel "tacky" which thickening formulas often do for me. I also colour my hair regularly and haven't found any problems using the serum with  colour. 

If I sound equivocal it's because I'm not entirely sure it's worked alone. I've been using the other components of the system and definitely feel that overall my hair is thicker. It's also pretty easy to use which is a plus. 


I have really fine hair which is always a nightmare to deal with, it's either flat and lacking in volume or frizzy and fluffy. So I was really excited to try this product.

PROS: Nice fresh smell, doesn't have that thick, heavy oily consistancy many thin hair products do so the hair doesn't feel weighed down. I did notice a difference and my hair had more oomphh  and volume so I was pleased.

CONS: If you have long hair, which many women do, you need 3+ pumps to do the product justice. My hair is half way between my bra strap and bottom and I needed 4 to 5. As such the bottle doesn't last long and there is no way 2 bottles of this would even come close to lasting 3 months unless you were a man with short hair.


I have used the Thicker Hair Serum for about a month and have noticed that my hair appears slightly thicker however there is not a significant difference. I have noticed that my hair is not falling out as much and also doesn't get as many knots and breakage. I have found that my hair feels very dry and my hairdresser also commented that my hair is very dry at the moment. My hair is naturally wavy and I have found that the serum weighs my hair down and causes the hair to stick togeter in clumps particularly noticeable after my hair gets wet and then air drys.


I have been using the L'Oreal Serioxyl Thicker Hair Serum for around a month as part of an overall hair care system. The serum is applied to wet hair after it has been shampood and conditioned. As it is part of a 4 step process it is difficulty to say exactly which results are from this product specifically but I shall do my best to review.

This product is nicely packaged and has a very professional feel to it.

This product is easy to use - it is a simple pump pack, and the serum is massaged through from roots to tips on wet hair. The instructions do not specify how many 'pumps' to use and as it is applied to wet hair I'm not always sure if I have used enough/too much.

The product has no offensive smells and although it works by building up a coating on the hair my hair itself doesn't feel overly weighed down with product.

It can be a time consuming process with so many steps involved but they all work to enhance each other. I do feel there is an improvement in the appeareance of my hair - I have certainly had less breakages and hair loss since starting and I feel the volume is improving. My hair is looking healthy and shiny. I have an appointment with my hairdresser next week who always comments on my whispy fine hair so it will be intersting to see if she observes a difference.

I look forward to continuing this trial and the products involved.


It works ... this product makes your hair feel much bulkier and fuller after applying a small amount. I definitely wouldn't want to wear it everyday as it makes me feel the need to wash my hair at the end of a day of wearing it. Think of it like hairspray combined with dry shampoo and multiply that by 2 and you're getting close to how this feels in your hair and on your scalp. It's great for when you want 'big' hair, but for me it's not for every day use.  I do find the scent a big overpowering also but I guess that's a small price to pay for big hair! 


I have been using the Serioxyl thicker hair Serum daily for 3 weeks. I love the smell of this product and I really like the fact that it does not weigh my hair down or leave a greasy texture. 

I find that if I use this product along with the Serioxyl thickening mousse, and then blow dry and straighten, my hair does appear fuller.

If I apply the thicker hair serum and leave to dry naturally, the texture of my hair feels 'fluffier' than normal. I don't really love this texture, so I would probably only use the product on the days where I style my hair.

Overall, this product on its own I don't feel has made any dramatic change in the fullness of my hair. I do however like this product and feel it gives me best results if I use it and then style. 


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