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Nioxin Hair Booster Serum is an advanced leave-in treatment designed to strengthen and nourish thinning hair from the root to the tips. This intensive serum targets weak, fragile strands, helping to create a healthy environment for hair growth and protecting the thickness of each hair strand.
Formulated with a Vitamin Complex, the Nioxin Hair Booster Serum is ideal for areas of progressed thinning, such as a receding hairline or low-density crown. It forms a protective barrier around the hair follicle, safeguarding against damage while promoting stronger, thicker-looking hair. With its warming sensation upon application, this serum works to improve the appearance of thinning hair and can be easily integrated into your daily routine. For best results, apply the serum before using your Nioxin System Kit’s Scalp Care and Hair Thickening Treatment.
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Directions
How To Use Nioxin Hair Booster Serum
Massage twice daily into areas of concern.
Distribute through hair using fingertips, from the roots to the tips at areas of low density and along the hairline.
If you are using a System Kit, apply the Hair Booster Serum before applying the Scalp + Hair Thickening Treatment from your System Kit.
The water base that carries and dissolves the other ingredients in most products.
May suit
All hair and skin types.
Worth knowing
Almost always the first ingredient listed in water-based products.
AquaSolvents
Solvent
The water base that carries and dissolves the other ingredients in most products.
May suit
All hair and skin types.
Worth knowing
Almost always the first ingredient listed in water-based products.
AquaSolvents
Solvent
The water base that carries and dissolves the other ingredients in most products.
May suit
All hair and skin types.
Worth knowing
Almost always the first ingredient listed in water-based products.
PhenoxyethanolPreservatives
Preservative
Helps keep the product stable and pleasant to use after opening.
May suit
All products that need protecting from spoilage.
Worth knowing
A very common, well-studied preservative used at low levels.
Benzyl AlcoholPreservatives
Preservative
Helps preserve formulations and can also act as a solvent or light fragrance component.
May suit
Those interested in understanding preservative systems or identifying potential fragrance allergens.
Worth knowing
Benzyl Alcohol is commonly used in professional haircare to support product stability and texture. It can also naturally occur in some essential oils.
PEG-23MThickeners and stabilisers
Thickener
A high–molecular weight polyethylene glycol used to thicken and stabilise haircare formulations.
May suit
People who prefer products with a smooth, gel-like texture or enhanced slip during application.
Worth knowing
It helps improve product consistency and spreadability without adding heaviness to the formula. It is widely used because it remains stable and blends well with many other ingredients.
Acetamide MEAHumectants
Moisturising humectant
Helps attract and hold moisture in the hair.
May suit
Those with dry or dehydrated hair seeking smoother, more manageable texture.
Worth knowing
It is commonly used to improve hair softness and maintain moisture balance in formulations. It can also support the spreadability and feel of leave‑in and rinse‑off products.
Acrylates/C10-30 Alkyl Acrylate CrosspolymerThickeners and stabilisers
Thickener and stabiliser
Helps thicken and stabilise formulas to create a smooth, consistent texture.
May suit
Those who prefer products with a rich, gel-like texture or improved spreadability.
Worth knowing
It is widely used in gels, creams and styling products to help keep ingredients evenly dispersed. It can also support formula pH adjustment and enhance product feel.
PEG-12 DimethiconeSilicones
Silicone-based conditioning agent
A water-dispersible silicone that helps soften hair, add slip and reduce frizz.
May suit
People looking for smoother, easier-to-detangle hair without a heavy silicone feel.
Worth knowing
Because it is water-dispersible, it tends to rinse out more easily than many traditional silicones. It is commonly used in both rinse-off and leave-in formulas for added manageability.
TriethanolaminepH adjusters
pH adjuster
Triethanolamine helps adjust and stabilise the pH of haircare formulations.
May suit
Those interested in how a product maintains stability and performance may find this ingredient relevant.
Worth knowing
It is commonly used in small amounts to help products stay within an effective pH range. Its presence supports formulation texture and consistency.
Polysorbate 80Thickeners and stabilisers
Solubiliser and emulsifier
Helps blend oil-based and water-based ingredients for a smooth, stable formula.
May suit
Those using products with essential oils or oil-based actives that need even distribution.
Worth knowing
It is widely used to keep formulations consistent and prevent separation. In haircare, it can also support the even spread of conditioning or fragrance oils.
Polysorbate 60Thickeners and stabilisers
Emulsifier and solubiliser
Helps blend oil- and water-based ingredients and keep formulas stable.
May suit
Those using creams or conditioners that rely on smooth, even textures.
Worth knowing
It is widely used in haircare to ensure consistent texture and to help disperse ingredients evenly. It also offers mild surfactant properties that support product spreadability.
Sodium BenzoatePreservatives
Preservative
Helps protect water-based products from spoilage so they stay usable.
May suit
All products that need a preservative system.
Worth knowing
Often paired with other preservatives for broad protection.
Methyl NicotinateAnti-dandruff / scalp care
Scalp-stimulating agent
Helps increase surface microcirculation on the scalp.
May suit
People using stimulating or energising scalp products aiming to support a refreshed sensation.
Worth knowing
It is often included at low levels in targeted scalp treatments to create a warming effect. This tingling sensation is normal and is linked to its circulation-boosting activity.
Mentha Arvensis Leaf OilBotanical extracts
Refreshing botanical oil
A mint-derived essential oil used to provide a fresh scent and a cooling, invigorating feel.
May suit
Those who enjoy refreshing, minty sensations or products designed to invigorate the scalp.
Worth knowing
It is commonly used in haircare for its characteristic aroma and cooling effect. Essential oils are typically included at low levels to support sensory benefits.
Sodium ChlorideThickeners and stabilisers
Viscosity adjuster
Sodium Chloride is used to adjust the thickness of shampoos and other cleansing formulas.
May suit
Those interested in how a product’s texture and lather are achieved.
Worth knowing
It is a simple mineral salt that helps create a familiar shampoo feel and can influence how a cleanser spreads through the hair.
Propylene GlycolHumectants
Humectant
Helps hold moisture and carry other ingredients through the formula.
May suit
Most hair types as part of a moisturising formula.
Worth knowing
A widely used humectant and carrier ingredient.
SilicaThickeners and stabilisers
Absorbent and texturising agent
Silica helps control oil, improve texture and provide slip in haircare formulas.
May suit
Those using styling or dry-finish products that benefit from a lightweight, matte feel.
Worth knowing
It is a common mineral ingredient used to enhance spreadability and stabilise product textures. It appears in a wide range of hair and styling products for its versatility.
Provides a cooling, refreshing effect and adds natural aroma to haircare products.
May suit
Those who enjoy invigorating, minty formulas or products designed to refresh the scalp.
Worth knowing
Peppermint oil is commonly used in small amounts for its sensory benefits and perceived scalp‑refreshing qualities. As with many essential oils, sensitivity varies between individuals.
Helps blend oil- and water-based ingredients into a stable, uniform product.
May suit
Those looking for smooth, consistent textures in styling or conditioning formulas.
Worth knowing
It is a non-ionic emulsifier often used to improve spreadability and product stability. Its presence helps formulas remain uniform over time.
LimoneneFragrance ingredients
Fragrance component
A fragrance component that also occurs naturally in many citrus and plant oils.
Worth knowing
A fragrance component that must be listed separately on labels because a minority of people can be sensitive to it. Its presence is normal, required disclosure and is not a quality signal.
LecithinConditioning agents
Emollient & conditioning agent
Lecithin helps soften and condition the hair while supporting product texture.
May suit
Those seeking added softness, moisture support or smoother-feeling hair.
Worth knowing
It is a phospholipid commonly derived from soy or sunflower and is valued for its ability to enhance spreadability and moisture retention. It can also help stabilise certain formulations.
Serenoa Serrulata Fruit ExtractBotanical extracts
Botanical extract
A plant-derived extract used to help support a balanced scalp environment.
May suit
Those interested in scalp‑focused formulas or products aimed at maintaining comfortable, refreshed roots.
Worth knowing
This extract is commonly included in hair and scalp products for its traditional use in promoting scalp comfort. Its effects depend on the full formulation and product type.
Humulus Lupulus ExtractBotanical extracts
Botanical extract
A plant extract used for its soothing and antioxidant properties in hair and scalp products.
May suit
Those looking for botanical ingredients that support scalp comfort or add gentle conditioning benefits.
Worth knowing
It is commonly included in formulations to complement other conditioning and calming agents. Its benefits can vary depending on extract concentration and product type.
Chondrus Crispus ExtractBotanical extracts
Seaweed-derived moisturising extract
A red algae extract that helps hydrate and soften hair while supporting a smoother feel.
May suit
Those looking for lightweight moisture or added softness without heaviness.
Worth knowing
This extract is valued for its natural polysaccharides, which can provide a flexible film on the hair for light conditioning. It is commonly used in both hair and skin formulations.
Centella Asiatica ExtractBotanical extracts
Soothing botanical extract
A plant extract used to help soothe and condition the scalp and hair.
May suit
People looking for calming or restorative scalp‑care benefits.
Worth knowing
Centella-based extracts are commonly included for their gentle, comforting feel on the scalp. They are often paired with other botanical ingredients in modern haircare formulas.
Glycyrrhiza Glabra Root ExtractBotanical extracts
Soothing botanical extract
A plant extract used for its soothing and calming properties on the scalp.
May suit
Those looking to support a comfortable scalp or reduce the feeling of irritation.
Worth knowing
It is commonly included in scalp‑focused formulas for its naturally calming profile. As with most botanical extracts, its exact benefits can vary depending on concentration and formulation.
BHTPreservatives
Antioxidant
BHT acts as an antioxidant that helps keep formulas stable over time.
May suit
Anyone using products that benefit from extended shelf life and maintained performance.
Worth knowing
It helps protect oils and other sensitive ingredients from breaking down when exposed to air and light. It is used in very small amounts to support product consistency.
Potassium SorbatePreservatives
Preservative
Helps keep haircare formulas stable by preventing the growth of microbes.
May suit
Anyone who uses water-based products that benefit from reliable preservation.
Worth knowing
It is commonly used alongside other preservation systems to maintain product freshness and extend shelf life. It is generally well tolerated in rinse-off and leave-in products.