Biolage Full Density Shampoo Versus Nioxin System 2 Scalp + Hair Shampoo
Updated on March 07, 2025
Overview
What they are
These products are both shampoos. They have a total of 10 ingredients in common
Cool Features
They both contain AHA, BHA and Vitamin E
Suited For
They're both likely to be good for fighting acne, anti aging, dry skin, brightening skin, oily skin, reducing pores, scar healing and better texture
Free From
They both do not contain any silicones
What's Inside
They both contain common allergens, fragrances and sulfates
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.
Ingredient Info
Biolage Full Density Shampoo 33 ingredients
Nioxin System 2 Scalp + Hair Shampoo 42 ingredients
What's inside
What's inside
At a glance
Click on any of the items below to learn more
Biolage Full Density Shampoo 33 ingredients
Nioxin System 2 Scalp + Hair Shampoo 42 ingredients
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningSodium Laureth Sulfate
Cleansing
Sodium Lauryl Sulfate
Cleansing
Coco-Betaine
CleansingHexylene Glycol
EmulsifyingSodium Chloride
Masking
Parfum
Masking
Glycol Distearate
Emollient
Sodium Hydroxide
BufferingCitric Acid
Buffering
Alcohol Denat.
Antimicrobial
Polyquaternium-30
Hydroxypropyl Guar Hydroxypropyltrimonium Chloride
Carbomer
Emulsion StabilisingLimonene
Perfuming
Hexyl Cinnamal
Perfuming
Coumarin
Perfuming
Benzyl Alcohol
Perfuming
Magnesium Nitrate
Linalool
Perfuming
Salicylic Acid
Masking
Amyl Cinnamal
Perfuming
Zinc PCA
Humectant
Biotin
AntiseborrhoeicSafflower Glucoside
Geraniol
Perfuming
Isoeugenol
Perfuming
Alpha-Isomethyl Ionone
Perfuming
Methylchloroisothiazolinone
Preservative
Magnesium Chloride
Methylisothiazolinone
Preservative
Tocopherol
Antioxidant
Sodium Citrate
BufferingWater, Sodium Laureth Sulfate, Sodium Lauryl Sulfate, Coco-Betaine, Hexylene Glycol, Sodium Chloride, Parfum, Glycol Distearate, Sodium Hydroxide, Citric Acid, Alcohol Denat., Polyquaternium-30, Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Carbomer, Limonene, Hexyl Cinnamal, Coumarin, Benzyl Alcohol, Magnesium Nitrate, Linalool, Salicylic Acid, Amyl Cinnamal, Zinc PCA, Biotin, Safflower Glucoside, Geraniol, Isoeugenol, Alpha-Isomethyl Ionone, Methylchloroisothiazolinone, Magnesium Chloride, Methylisothiazolinone, Tocopherol, Sodium Citrate
Water
Skin ConditioningSodium Laureth Sulfate
Cleansing
Sodium Lauryl Sulfate
Cleansing
Cocamidopropyl Betaine
Cleansing
Cocamide Mea
EmulsifyingSodium Benzoate
Masking
Citric Acid
Buffering
Sodium Chloride
Masking
Salicylic Acid
Masking
Mentha Arvensis Leaf Oil
Masking
Mentha Piperita Oil
Masking
Tetrasodium EDTA
Methylparaben
Preservative
Propylene Glycol
Humectant
Glycerin
Humectant
Sodium Hydroxide
BufferingLimonene
Perfuming
Camellia Sinensis Leaf Extract
Antimicrobial
Cystine Bis-Pg-Propyl Silanetriol
Skin ConditioningNiacinamide
Smoothing
Panthenol
Skin Conditioning
Biotin
AntiseborrhoeicLecithin
Emollient
Tocopheryl Acetate
Antioxidant
Citrus Paradisi Peel Extract
Perfuming
Humulus Lupulus Extract
AntimicrobialUrtica Dioica Leaf Extract
Skin ConditioningCI 42090
Cosmetic ColorantAcer Saccharum Extract
Skin ConditioningCitrus Limon Peel Extract
EmollientSaccharum Officinarum Extract
MoisturisingVaccinium Myrtillus Leaf Extract
AstringentFaex Extract
Skin ConditioningPropylparaben
Preservative
Phenoxyethanol
Preservative
Citrus Aurantium Dulcis Fruit Extract
MaskingPotassium Sorbate
Preservative
Maltodextrin
Absorbent
Sodium Citrate
BufferingEthylparaben
Preservative
Butylparaben
Masking
Sodium Xylenesulfonate
Water, Sodium Laureth Sulfate, Sodium Lauryl Sulfate, Cocamidopropyl Betaine, Cocamide Mea, Sodium Benzoate, Citric Acid, Sodium Chloride, Salicylic Acid, Mentha Arvensis Leaf Oil, Mentha Piperita Oil, Tetrasodium EDTA, Methylparaben, Propylene Glycol, Glycerin, Sodium Hydroxide, Limonene, Camellia Sinensis Leaf Extract, Cystine Bis-Pg-Propyl Silanetriol, Niacinamide, Panthenol, Biotin, Lecithin, Tocopheryl Acetate, Citrus Paradisi Peel Extract, Humulus Lupulus Extract, Urtica Dioica Leaf Extract, CI 42090, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, Faex Extract, Propylparaben, Phenoxyethanol, Citrus Aurantium Dulcis Fruit Extract, Potassium Sorbate, Maltodextrin, Sodium Citrate, Ethylparaben, Butylparaben, Sodium Xylenesulfonate
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Biotin is a B vitamin that is naturally produced by our bodies. It is also called Vitamin H.
Our bodies use biotin in the metabolism process. It also helps our bodies use enzymes and move nutrients around. A biotin deficiency can lead to brittle hair and nails.
More research is needed on applying biotin topically. However, taking biotin orally has been shown to help nourish the skin, hair, and nails. They play a role in forming skin-hydrating fatty acids.
Biotin is water-soluble. It can be found in foods such as fish, eggs, dairy, nuts, and meat. Vitamin H stands for "haar" and "haut". These are the German words for hair and skin.
Learn more about BiotinCitric Acid is an alpha hydroxy acid (AHA) naturally found in citrus fruits like oranges, lemons, and limes.
Like other AHAs, citric acid can exfoliate skin by breaking down the bonds that hold dead skin cells together. This helps reveal smoother and brighter skin underneath.
However, this exfoliating effect only happens at high concentrations (20%) which can be hard to find in cosmetic products.
Due to this, citric acid is usually included in small amounts as a pH adjuster. This helps keep products slightly more acidic and compatible with skin's natural pH.
In skincare formulas, citric acid can:
While it can provide some skin benefits, research shows lactic acid and glycolic acid are generally more effective and less irritating exfoliants.
Most citric acid used in skincare today is made by fermenting sugars (usually from molasses). This synthetic version is identical to the natural citrus form but easier to stabilize and use in formulations.
Read more about some other popular AHA's here:
Learn more about Citric AcidLimonene is a fragrance that adds scent and taste to a formulation.
It's found in the peel oil of citrus fruits and other plants such as lavender and eucalyptus. The scent of limonene is generally described as "sweet citrus".
Limonene acts as an antioxidant, meaning it helps neutralize free radicals.
When exposed to air, oxidized limonene may sensitize the skin. Because of this, limonene is often avoided by people with sensitive skin.
The term 'fragrance' is not regulated in many countries. In many cases, it is up to the brand to define this term. For instance, many brands choose to label themselves as "fragrance-free" because they are not using synthetic fragrances. However, their products may still contain ingredients such as essential oils that are considered a fragrance.
Learn more about LimoneneSalicylic Acid (also known as beta hydroxy acid or BHA) is a well-known ingredient for treating skin that struggles with acne and clogged pores. It exfoliates both the skin's surface and deep within the pores to help clear out buildup, control oil, and reduce inflammation.
Unlike AHAs (alpha hydroxy acids), salicylic acid is oil-soluble. This allows it to penetrate into pores which makes it especially effective for treating blackheads and preventing future breakouts.
Salicylic acid is also known for its soothing properties. It has a similar structure to aspirin and can calm inflamed or irritated skin, making it a good option for acne-prone skin that is also sensitive.
Concentrations of 0.5-2% are recognized by the U.S. FDA as an over-the-counter topical acne product.
It can cause irritation and/or dryness if one's skin already has a compromised moisture barrier, so it's best to focus on repairing that before introducing this ingredient into your routine.
While salicylic acid does not increase sun sensitivity, it’s still important to wear sunscreen daily to protect your skin.
If you are looking for the ingredient called BHA or Butylated Hydroxyanisole, click here.
Learn more about Salicylic AcidChances are, you eat sodium chloride every day. Sodium Chloride is also known as table salt.
This ingredient has many purposes in skincare: thickener, emulsifier, and exfoliator.
You'll most likely find this ingredient in cleansers where it is used to create a gel-like texture. As an emulsifier, it also prevents ingredients from separating.
There is much debate on whether this ingredient is comedogenic. The short answer - comedogenic ratings don't tell the whole story. Learn more about comegodenic ratings here.
The concensus about this ingredient causing acne seems to be divided. Research is needed to understand if this ingredient does cause acne.
Scrubs may use salt as the primary exfoliating ingredient.
Learn more about Sodium ChlorideSodium Citrate is the sodium salts of citric acid. In skincare, it is used to alter pH levels and acts as a preservative.
Its main functions are to maintain the pH of a product and neutralize metal ions.
The acidity of our skin is maintained by our glands and skin biome; normal pH level of skin is slightly acidic (~4.75-5.5).
Being slightly acidic allows our skin to create an "acid mantle". This acid mantle is a thin barrier that protects our skin from bacteria and contaminants.
Learn more about Sodium CitrateSodium Hydroxide is also known as lye or caustic soda. It is used to adjust the pH of products; many ingredients require a specific pH to be effective.
In small amounts, sodium hydroxide is considered safe to use. However, large amounts may cause chemical burns due to its high alkaline.
Your skin has a natural pH and acid mantle. This acid mantle helps prevent harmful bacteria from breaking through. The acid mantle also helps keep your skin hydrated.
"Alkaline" refers to a high pH level. A low pH level would be considered acidic.
Learn more about Sodium HydroxideSodium Laureth Sulfate (SLES) is a foaming, cleansing, and emulsifying ingredient. It is created from palm kernel oil or coconut oil. SLES is not the same as sodium lauryl sulfate. It is much milder and less likely to irritate.
SLES helps create foam in personal products. It also prevents ingredients from separating, helping to elongate the shelf life.
Sodium Laureth Sulfate is a type of sulfate. It can be drying. We recommend speaking with a professional about using this ingredient if you have concerns.
Learn more about Sodium Laureth SulfateSodium Lauryl Sulfate (SLS) is a sulfate with surfactant properties.
The surfactant property make it a great foam creator and cleansing agent. Surfactants help bind ingredients that normally do not mix.
Some studies have shown skin irritation due to prolonged SLS use.
Sodium Laureth Sulfate (SLES) is a milder version of SLS.
Learn more about Sodium Lauryl SulfateWater. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.
So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.
You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Stay hydrated!
Learn more about WaterIngredient Ratings
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Biolage Full Density Shampoo 33 ingredients
Nioxin System 2 Scalp + Hair Shampoo 42 ingredients
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