A daily leave-in spray for visibly fuller, denser-looking hair
L'Oréal Professionnel Serioxyl Advanced Densifying Serum is a leave-in scalp serum for thinning hair, and it replaces the former Serioxyl Denser Hair serum. Its formula combines 5% Stemoxydine, which supports the stem cells at the origin of new hair, with Resveratrol, an antioxidant that helps protect them from oxidative stress. Used every evening, it helps reduce the resting phase of the hair cycle, and the brand reports visibly denser hair and more hair mass in six weeks.
How it works
A light, silicone-free liquid in a spray bottle that you mist directly onto the scalp in sections. It leaves no residue, does not weigh the roots down and has a fresh scent.
Who it suits
- Hair that looks thinner or less dense than before
- Men and women who want fuller-looking hair
- People who prefer an easy, no-rinse evening routine
Worth knowing before you buy: Results build with daily use over several weeks, so it suits patient, consistent users. It contains fragrance.
How long one bottle lasts
At around 24 sprays per evening, the 90ml bottle lasts about one month.
Complete the routine

Serioxyl Purifying Shampoo
Cleanses the scalp before the serum.
Shop →
Phytophanere Ampoules
A scalp treatment against hair fall.
Shop →Characteristics
- Texture: liquid spray
- Hair type: all hair types
- Hair concerns: thinning hair, loss of density
- When to apply: every evening
- Main benefits: denser-looking hair in six weeks, more hair mass, lightweight and fresh, no rinse
- Formulated without: silicones
How to use
In the evening, after your shower, divide towel-dried hair into four sections and spray six times onto the scalp in each section. Massage in and leave on. Do not rinse.
Active ingredients
- Stemoxydine (5%): helps the stem cells responsible for new hair work properly, for denser-looking hair
- Resveratrol: antioxidant that helps protect the hair from oxidative stress
Manufacturer information
Brand: L'Oréal Professionnel
Address: 14 rue Royale, 75008 Paris, France
EAN: 3474637106348
