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NIOXINScalp and Hair Thickening System 4 Leave on Treatment
Product Description
We are Nioxin, the #1 Professional brand for thicker, fuller hair. We are pioneers of a hair movement that's never going to stop. We believe everyone should experience the uplift that comes from having hair that looks and feels the way they actually want it to: Thicker. Fuller. Healthier.
Built on a legacy of clinically proven solutions, we turn scalp science into true scalp care and hair thickening products. The kind of products with proven results. Because everyone, yes everyone, deserves to grow thicker, fuller hair they can see and feel. Nioxin Grows Results(TM).
Thickens the hair: Nioxin System Kit 4 is clinically designed to add thickness and fullness to dry, damaged, color-treated hair with progressed thinning, with visible results in just 30 days.
Supports scalp health: The advanced formula of Nioxin System Kit 4 gently cleanses the scalp, removing impurities and excess sebum that can clog hair follicles, creating a healthier environment for the scalp.
Reduces hair thinning: By strengthening hair resilience, Nioxin System Kit 2 helps minimise hair breakage, promoting the appearance of fuller, thicker hair while protecting the hair color.
Nourishes the scalp: Infused with nourishing botanicals, antioxidants, and UV protecting ingredients, this kit's Scalp + Hair Thickening Treatment can nourish and revitalise the scalp, improving its overall health and condition.
Built on a legacy of clinically proven solutions, we turn scalp science into true scalp care and hair thickening products. The kind of products with proven results. Because everyone, yes everyone, deserves to grow thicker, fuller hair they can see and feel. Nioxin Grows Results(TM).
Directions
Apply the Scalp + Hair Thickening Treatment directly to the scalp. Shake it well before applying directly to the entire scalp. Gently massage it in. Do not rinse.
Test results
85% of consumers noticed a thickening effect, 80% noticed an increase in hair density, 80% noticed an increase in hair fullness.Thickens the hair: Nioxin System Kit 4 is clinically designed to add thickness and fullness to dry, damaged, color-treated hair with progressed thinning, with visible results in just 30 days.
Supports scalp health: The advanced formula of Nioxin System Kit 4 gently cleanses the scalp, removing impurities and excess sebum that can clog hair follicles, creating a healthier environment for the scalp.
Reduces hair thinning: By strengthening hair resilience, Nioxin System Kit 2 helps minimise hair breakage, promoting the appearance of fuller, thicker hair while protecting the hair color.
Nourishes the scalp: Infused with nourishing botanicals, antioxidants, and UV protecting ingredients, this kit's Scalp + Hair Thickening Treatment can nourish and revitalise the scalp, improving its overall health and condition.
Ingredients
Aqua/Water/Eau, Niacinamide, Phenylbenzimidazole Sulfonic Acid, Caffeine, Polysorbate 20, Benzophenone-4, Phenoxyethanol, Sodium Benzoate, PEG-12 Dimethicone,
Benzyl Alcohol, Sodium Hydroxide, Cocamidopropyl Betaine, Acetamide MEA, Tetrasodium EDTA, Propylene Glycol, Methyl Nicotinate, Mentha Arvensis Leaf Oil,
Parfum/Fragrance, Polysorbate 80, Polysorbate 60, PEG-23M, Mentha Piperita (Peppermint) Oil, Limonene, Camellia Sinensis Leaf Extract, Cystine Bis-PG-Propyl
Silanetriol, Lecithin, Tocopheryl Acetate, Biotin, Foeniculum Vulgare (Fennel) Fruit Extract, Silica, Citrus Limon (Lemon) Peel Extract, Saccharum Officinarum/Sugar Cane
Extract/Extrait de canne à sucre, Acer Saccharum (Sugar Maple) Extract, Vaccinium Myrtillus Leaf Extract, Citric Acid, Faex Extract/Yeast Extract/Extrait de levure,
Propylparaben, Citrus Aurantium Dulcis (Orange) Fruit Extract, Maltodextrin, Methylparaben, Potassium Sorbate, Ethylparaben, Butylparaben, BHT.
This list of ingredients may be subject to change, please consult the packaging of the product purchased.
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Rated 5 out of
5
by
emilyd403_375 from
Great system.
[This review was collected as part of a promotion.] I started using the Nioxin System 4 bundle for my coloured, thinning hair and noticed a difference within weeks. The shampoo cleans gently without stripping colour, the conditioner leaves my scalp refreshed, and the serum adds a healthy fullness. My hair feels stronger, looks thicker, and has a lovely shine. It’s a salon-quality solution that really delivers on its promise to improve scalp health and encourage thicker-looking hair. Great smell. Big bottles to last too.
Date published: 2025-08-20
Rated 5 out of
5
by
kiki26_2822 from
Foam hair treatment
[This review was collected as part of a promotion.] This product is a gem, after using the shampoo and conditioner, this final step of hair treatment really adds to the refreshed, clarified and healthy scalp and hair. It is an easy to use pump bottle with the product itself being a foam consistency rather than the usual oil or serum and is easy to massage into the scalp. Very impressed with the whole range.
Date published: 2025-08-18
Rated 4 out of
5
by
gaynaj_2941 from
Minty fresh mousse. Seems to work well on my scalp
[This review was collected as part of a promotion.] A minty fresh smell. Hair seems to look a bit thicker. Was amazed at the way this worked on my dandruff and kept my hair looking less greasy over a week. Worried I will use this up quicker than the shampoo.
Date published: 2025-08-17
Rated 2 out of
5
by
shez23_6747 from
Herbal scent and greasy
[This review was collected as part of a promotion.] Leave in treatment but I find it makes your hair very greasy so im not sure how we are meant to leave it in whilst also going agout our day. It has a herbal scent and it is very expensive. I have not noticed any difference in my hair
Date published: 2025-08-16
Rated 5 out of
5
by
savannac32_842 from
Game changer
[This review was collected as part of a promotion.] I’ve been using the Nioxin System 4 Hair Serum as part of the full System 4 routine, and it’s the perfect finishing step. The lightweight, foam-like texture makes it easy to apply without leaving my hair greasy or weighed down. It has that same refreshing minty scent as the shampoo and conditioner, which feels amazing on the scalp.
I have blue hair, and just like the rest of the Nioxin range, this serum doesn’t strip or dull my colour. Instead, it leaves my hair feeling healthier and looking fuller. My scalp feels refreshed and nourished, and I’ve noticed much less breakage despite my constant bleaching.
It’s quick to use, absorbs fast, and gives my hair that strong, resilient feel from root to tip. Definitely worth it if you’re looking for a treatment that actually supports hair health while keeping colour intact.
Date published: 2025-08-13
Rated 5 out of
5
by
daniellem550_5190 from
Nice on the hair
[This review was collected as part of a promotion.] This had definitely helped with my hair , it’s feeling nice and thicker , and it’s dosnt feel as damaged as it did as I have long hair and colour it , would definitely get again
Date published: 2025-08-12
Rated 5 out of
5
by
isabellapacelli_9092 from
Nice serum
[This review was collected as part of a promotion.] Really like this serum. The pump is really easy to use and doesn’t get messy. Not too thick and feels nice in the hair. Decently size bottle as well
Date published: 2025-08-07
Rated 5 out of
5
by
kayleighg65_3602 from
East to apply product
[This review was collected as part of a promotion.] Great brand, Really Effective Product and Easy to apply, Even though this is a leave in product it doesn’t make your hair feel stiff or greasy like other products
Date published: 2025-07-30
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