How do I know which System Kit is right for me?

For natural, untreated hair with light thinning, we recommend System Kit 1. For natural, untreated hair with progressed thinning, we recommend System Kit 2. For damaged, dry, or colored treated hair with light thinning, we recommend System Kit 3. For damaged, dry, or color treated hair with progressed thinning, we recommend System Kit 4.

How do I know which kit to use if I previously used System Kit 5 or 6?

We recently transitioned from 6 kits to 4 to make it even easier to navigate which kit will help you meet your hair goals. If you previously used System Kit 5, we recommend using System Kit 3. If you recently used System Kit 6, we recommend using System Kit 4.

How often should I use the 3-step system to see results?

We recommend using the complete system at least 3 times a week for visible results in 30 days.

Can I use the Nioxin System 4 leave-in treatment every day?

For optimal results, use the Nioxin System 4 Leave-In Treatment daily for visible results in 30 days

What are signs of progressed thinning?

Progressed thinning may become more noticeable over time. Signs can include a wider-looking part, increased scalp visibility, noticeably reduced hair density, and difficulty achieving fuller-looking styles.

How is thinning different from hair fall?

Hair fall refers to the shedding of individual hair strands, which can be a normal part of the hair growth cycle. Hair thinning refers to a gradual reduction in hair density, which can make hair feel less full over time. Signs of thinning may include a smaller ponytail, less volume, or reduced hair density.

What products should I use with Nioxin System 4 Leave In Treatment?

For optimal results, use Nioxin System 4 Leave-In Treatment alongside the System 4 Scalp + Hair Shampoo and Conditioner.

What's the difference between Nioxin System 2 and System 4?

Both are designed for progressed thinning, but for different hair needs. System 2 is recommended for natural, untreated hair, while System 4 is recommended for dry, damaged or color-treated hair.

System 4 Leave In Treatment 200 mL

Q: Can I use System 4 on color-treated hair?

Yes. System 4 is designed for dry, damaged, or color-treated hair with progressed thinning.

DAILY LEAVE-IN SCALP TREATMENT FOR DRY, DAMAGED OR COLOR-TREATED HAIR WITH PROGRESSED THINNING | ADVANCED STRENGTH

Current price $43.00

Lightweight Scalp Care for Dry, Damaged or Color Treated Hair with Progressed Thinning

Nioxin System 4 Scalp + Hair Thickening Treatment is designed for dry, damaged or color-treated hair with progressed thinning. Applied directly to the scalp and left in, it helps nourish and revitalize the scalp while enhancing the appearance of thicker, fuller-looking hair.

This lightweight leave-in treatment helps:

Nourish and revitalize the scalp

Enhance the appearance of hair thickness and fullness

Support a healthy scalp environment

Leave hair looking fuller and thicker

For optimal results, use alongside Nioxin System 4 Scalp + Hair Shampoo and Conditioner.

Featured Ingredients

Niacinamide

A form of vitamin B3, that helps to increase the diameter of each hair strand and improve the scalp skin barrier function

Caffeine

Known to help stimulate hair follicles, maintain the skin barrier, and with massage improves blood microcirculation

Mentha Arvensis Leaf Oil

Also known as wild mint oil, this oil is known for its refreshing and invigorating benefits that stimulate the scalp and promote circulation

Full Ingredients List:

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.

HOW TO USE

Apply Nioxin System 4 Scalp + Hair Thickening Treatment to towel-dried hair, focusing on the scalp and areas of concern.
Massage gently to ensure even distribution.
Do not rinse out. Style as desired.
For optimal results, use alongside Nioxin System 4 Scalp + Hair Shampoo and Conditioner.

NIOXIN GROWS RESULTS

LEARN MORE

TARGETED LEAVE-IN SCALP APPLICATION

Designed for dry, damaged or color-treated hair with progressed thinning

SCALP CARE

Helps nourish and revitalize the scalp while enhancing the appearance of thicker, fuller looking hair.

VISIBLE RESULTS IN AS LITTLE AS 30 DAYS*

Hair looks thicker, denser and fuller with continued use as part of your System 4 routine.*

SYSTEM KIT 1

For natural, untreated hair with light thinning. Best for those beginning to notice less fullness and volume.

SYSTEM KIT 2

For natural, untreated hair with progressed thinning. Best for more noticeable changes in fullness and scalp visibility.

SYSTEM KIT 3

For dry, damaged, or color-treated hair with light thinning. Best for hair experiencing reduced fullness and volume.

SYSTEM KIT 4

For dry, damaged, or color-treated hair with progressed thinning. Best for more noticeable changes in fullness and scalp visibility.

WHY SCALP CARE MATTERS FOR THINNING HAIR

Healthy-looking hair starts with the scalp. Over time, buildup, excess sebum, and environmental stressors can impact the scalp environment.

Scalp-focused care helps create the foundation for thicker-, fuller-looking hair. Nioxin's scalp-first approach is designed to support the scalp while helping hair appear denser and more voluminous.

Learn more about the importance of scalp care HERE.

WHY SCALP CARE MATTERS FOR THINNING HAIR

Ingredients

CAFFEINE

Known to help stimulate hair follicles, maintain the skin barrier, and with massage improves blood microcirculation

MENTHA ARVENSIS LEAF OIL

Also known as wild mint oil, this oil is known for its refreshing and invigorating benefits that stimulate the scalp and promote circulation

NIACINAMIDE

A form of Vitamin B3, niacinamide helps nourish the hair root and can have a positive impact on hair growth and overall scalp health

COMPLETE YOUR THICKENING ROUTINE

System Kit 4 Full Size Kit
BESTSELLER
System Kit 4 Full Size Kit
3-STEP THICKENING SYSTEM | PROGRESSED THINNING ADVANCED STRENGTH FOR DRY, DAMAGED OR COLOR-TREATED HAIR
System 4 Shampoo 300 mL
System 4 Shampoo 300 mL
FOR DRY, DAMAGED OR COLOR-TREATED HAIR WITH PROGRESSED THINNING | ADVANCED STRENGTH
System 4 Conditioner 300 mL
System 4 Conditioner 300 mL
SCALP + HAIR CONDITIONER FOR DRY, DAMAGED OR COLOR-TREATED HAIR WITH PROGRESSED THINNING | ADVANCED STRENGTH
System 4 Leave In Treatment 200 mL
System 4 Leave In Treatment 200 mL
DAILY LEAVE-IN SCALP TREATMENT FOR DRY, DAMAGED OR COLOR-TREATED HAIR WITH PROGRESSED THINNING | ADVANCED STRENGTH

FAQS

System 4 Leave In Treatment 200 mL

System 4 Leave In Treatment 200 mL

Product Details

PROVEN RESULTS

HOW IT WORKS

IS SYSTEM 4 RIGHT FOR YOU?

INGREDIENTS

HOW TO USE

NIOXIN GROWS RESULTS

WHY SCALP CARE MATTERS FOR THINNING HAIR​

Ingredients

COMPLETE YOUR THICKENING ROUTINE​

FAQS

How do I know which System Kit is right for me?

How do I know which kit to use if I previously used System Kit 5 or 6?

How often should I use the 3-step system to see results?

Can I use the Nioxin System 4 leave-in treatment every day?​

What are signs of progressed thinning?​

How is thinning different from hair fall?​

Can I use System 4 on color-treated hair?​

What products should I use with Nioxin System 4 Leave In Treatment?​

What's the difference between Nioxin System 2 and System 4?​

WHY SCALP CARE MATTERS FOR THINNING HAIR

COMPLETE YOUR THICKENING ROUTINE