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Product Comparison

Here's our complete breakdown comparing the ingredients, attributes, and more of Pureology Nanoworks Gold Hydrating Shampoo versus Pureology Smooth Perfection Shampoo .

Published on September 24, 2023

Overview

What they are

These products are both cruelty-free shampoos. They have a total of 39 ingredients in common

Cool Features

They both contain 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 and scar healing

Free From

They both do not contain any parabens or sulfates

What's Inside

They both contain harsh alcohols, common allergens, fragrances, oils and silicones

We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that need an update? Let us know.

Shampoo American Brand United States
Shampoo American Brand United States

Shampoo

Detergent or soap for cleansing the hair.

Shampoo

Detergent or soap for cleansing the hair.

Price

Shop

Buy Nanoworks Gold Hydrating Shampoo

Starts at $130.00
Shop

Buy Smooth Perfection Shampoo

Starts at $37.00

Ingredient Info

Click any item below to learn more and view relevant ingredients.
alcohol-free
silicon-free
fragrance-free
sulfate-free
paraben-free
oil-free
fungal-acne safe
reef-safe
eu-allergen-free
vegan
cruelty-free
alcohol-free
silicon-free
fragrance-free
sulfate-free
paraben-free
oil-free
fungal-acne safe
reef-safe
eu-allergen-free
vegan
cruelty-free

At a glance

Click on any of the items below to learn more

Notable Ingredients

BHA
Vitamin E

Benefits

Hydrating (3)
Good For Oily Skin
Reduces Irritation
Reduces Large Pores
Anti-Aging
Scar Healing (2)
Acne Fighting
Brightening (3)

Concerns

Drying (4)
May Worsen Oily Skin (3)
Acne Trigger
Irritating (6)
Rosacea (5)
Eczema (10)

Notable Ingredients

AHA
BHA
Vitamin C
Vitamin E

Benefits

Hydrating (3)
Good For Oily Skin
Redness Reducing
Skin Texture (2)
Reduces Large Pores (2)
Anti-Aging (2)
Dark Spots
Scar Healing (4)
Acne Fighting
Brightening (5)

Concerns

Drying (3)
May Worsen Oily Skin (2)
Acne Trigger
Irritating (5)
Rosacea (5)
Eczema (9)
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Ingredients Compared

Ingredients that are highlighted in purple are present in both products.

Ingredients Side-by-side

Ingredients that are highlighted in purple are present in both products.

Learn more about what what Com. / Irr. ratings are

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Ingredients Explained

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

1
What it does: Skin Conditioning, Solvent
Community Rating: Loved

Water. 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. Talk about multi-purpose! If you see this, drink a glass of water. Stay hydrated!

Learn more about Water

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 1.

Pureology Smooth Perfection Shampoo contains this as ingredient number 1.

2
What it does: Cleansing, Foaming
Community Rating: Disliked

We don't have a description for Disodium Laureth Sulfosuccinate.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 2.

Pureology Smooth Perfection Shampoo contains this as ingredient number 3.

3
What it does: Cleansing
Community Rating: Disliked

Cocamidopropyl Betaine is a fatty acid created by mixing similar compounds in coconut oil and dimethylaminopropylamine. Dimethylaminopropylamine is a diamine, an amine with two amino groups.

Cocamidopropyl Betaine is a surfactant and cleanser. It helps gather the dirt, pollutants, and other impurities in your skin to be washed away. It also helps thicken a product and make the texture more creamy.

Being created from coconut oil means Cocamidopropyl Betaine is hydrating for the skin.

While Cocamidopropyl Betaine was believed to be an allergen, a study from 2012 disproved this. It found two compounds in unpure Cocamidopropyl Betaine to be the irritants: aminoamide and 3-dimethylaminopropylamine. High-grade and pure Cocamidopropyl Betaine did not induce allergic reactions during this study.

Learn more about Cocamidopropyl Betaine

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 4.

Pureology Smooth Perfection Shampoo contains this as ingredient number 7.

4
What it does: Cleansing, Foaming
Community Rating: Very Disliked

Sodium Lauryl Sulfoacetate is an organic salt with a naturally sweet odor.

In cosmetics, this ingredient is used to increase the volume of foam. It is also an emulsifier and cleansing agent.

Sodium Lauryl Sulfoacetate helps reduce the surface tension of dirt, oil, and other pollutants.

Cosmetic Ingredient Review found this ingredient to irritate the eyes and skin in concentrations of 0.18% and 0.7%.

Learn more about Sodium Lauryl Sulfoacetate

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 5.

Pureology Smooth Perfection Shampoo contains this as ingredient number 4.

5
What it does: Emollient, Emulsifying, Skin Conditioning
Community Rating: Very Disliked

Glycol Distearate serves as a pearlizing or opacifying agent in cosmetic products.

It's often included in cleansers and haircare products to give them a lustrous or shimmering appearance.

It is derived from stearic acid, a natural fatty acid commonly found in vegetable oils and animal fats.

Glycol Distearate isn't fungal acne safe.

Learn more about Glycol Distearate

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 6.

Pureology Smooth Perfection Shampoo contains this as ingredient number 6.

We don't have a description for Divinyldimethicone/Dimethicone Copolymer.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 7.

Pureology Smooth Perfection Shampoo contains this as ingredient number 8.

7
What it does: Humectant
Community Rating: Mixed

Glycereth-26 is a synthetic ingredient and polyethylene glycol ether of Glycerin. Glycerin is already naturally found in your skin and helps keep your skin moisturized.

It is a humectant and helps add texture to products. It can make your product thicker.

As a humectant, it helps draw moisture from the air to your skin. This helps your skin stay hydrated.

Learn more about Glycereth-26

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 9.

Pureology Smooth Perfection Shampoo contains this as ingredient number 9.

8
What it does: Masking, Perfuming
Community Rating: Very Disliked

Parfum is a catch-all term for an ingredient or more that is used to give aroma to products. Parfum, or fragrance, can be a blend of hundreds of chemicals or plant oils. This means every product with "fragrance" or "Parfum" in the ingredients list is a different mixture.

In the US, the alternative name for parfum is 'fragrance'. 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. One example is Calendula flower extract. Essential oil ingredients still impart a scent or 'fragrance'.

Depending on the blend, it can cause allergies and sensitivities on the skin. Some ingredients that are known EU allergens include linalool and citronellol.

Products use parfum often to give products a scent or cover up smells of different ingredients.

The bottom line is: not all fragrances/parfum/ingredients are created equally. If you are worried about fragrances, we recommend taking a closer look at an ingredient. And of course, we always recommend speaking with a professional.

Learn more about Parfum

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 11.

Pureology Smooth Perfection Shampoo contains this as ingredient number 10.

9
What it does: Masking
Community Rating: Very Disliked

Chances 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 Chloride

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 12.

Pureology Smooth Perfection Shampoo contains this as ingredient number 19.

10
What it does: Emulsifying
Community Rating: Disliked

We don't have a description for Ppg-5-Ceteth-20.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 13.

Pureology Smooth Perfection Shampoo contains this as ingredient number 16.

11
What it does:
Community Rating: Disliked

Polyquaternium-10 is an ammonium salt of hydroxyethylcellulose. It is a white and granular powder used as a film-former and anti-static agent.

This ingredient is commonly found in hair conditioning products. According to a manufacturer, its positive charge makes it great for absorbing hair proteins. The manufacturer also states this ingredient helps with curl retention.

For haircare friends: this ingredient is not a silicone.

Learn more about Polyquaternium-10

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 15.

Pureology Smooth Perfection Shampoo contains this as ingredient number 18.

12
What it does:
Community Rating: Disliked

Amodimethicone is a type of silicone.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 16.

Pureology Smooth Perfection Shampoo contains this as ingredient number 20.

Peg-55 Propylene Glycol Oleate isn't fungal acne safe.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 17.

Pureology Smooth Perfection Shampoo contains this as ingredient number 22.

14
What it does: Humectant, Skin Conditioning, Solvent
Community Rating: Very Disliked

Propylene Glycol is an odorless, colorless liquid. As a humectant, it helps skin retain moisture. It also aids in delivering active ingredients.

Another role of this ingredient is preventing a product from melting or freezing. Propylene glycol also adds antimicrobrial properties to a product, elongating product lifespan.

This ingredient is considered an organic alcohol and commonly added into both cosmetics and foods.

Those with sensitive skin or conditions may deliver a rash when using this ingredient.

Learn more about Propylene Glycol

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 18.

Pureology Smooth Perfection Shampoo contains this as ingredient number 23.

15
What it does: Emulsion Stabilising, Gel Forming
Community Rating: Disliked

Carbomer is a polymer of acrylic acid. Its main role is to create gel consistency within products.

Carbomer is commonly found in many types of cosmetics products. It is found to be safe in concentrations up to 15%. However, a high amount of carbomer can cause pilling or balling up of products. Most products contain 1% of less of carbomer.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 20.

Pureology Smooth Perfection Shampoo contains this as ingredient number 24.

16
What it does: Emulsifying

We don't have a description for C11-15 Pareth-7.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 21.

Pureology Smooth Perfection Shampoo contains this as ingredient number 25.

17
What it does: Masking, Preservative
Community Rating: Disliked

Benzoic Acid is used to preserve and adjust the pH of products.

The antimicrobial property of Benzoic Acid helps elongate a product's shelf life. Its main role is to reduce fungi growth and is not found to be effective at fighting bacteria. Therefore Benzoic Acid is always added along with other preservatives.

In its pure form, Benzoic Acid looks like a white crystalline solid. It has slight solubility in water.

The name of Benzoic Acid comes from gum benzoin, which used to be the sole source of deriving this ingredient. Benzoic Acid is the most simple aromatic carboxylic acid.

Benzoic Acid is naturally occuring in strawberries, mustard, cinnamon, and cloves. It has a slight scent but is not considered to be a fragrance.

Learn more about Benzoic Acid

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 22.

Pureology Smooth Perfection Shampoo contains this as ingredient number 26.

18
What it does: Masking, Preservative
Community Rating: Disliked

Sodium Benzoate is a preservative. It's used in both cosmetic and food products to inhibit the growth of mold and bacteria. It is typically produced synthetically.

Both the US FDA and EU Health Committee have approved the use of sodium benzoate. In the US, levels of 0.1% (of the total product) are allowed.

Sodium benzoate works as a preservative by inhibiting the growth of bacteria inside of cells. It prevents the cell from fermenting a type of sugar using an enzyme called phosphofructokinase.

Sodium Benzoate is the salt of benzoic acid. Foods containing sodium benzoate include soda, salad dressings, condiments, fruit juices, wines, and snack foods.

Studies for using ascorbic acid and sodium benzoate in cosmetics are lacking, especially in skincare routines with multiple steps.

We always recommend speaking with a professional, such as a dermatologist, if you have any concerns.

Learn more about Sodium Benzoate

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 23.

Pureology Smooth Perfection Shampoo contains this as ingredient number 38.

19
What it does: Antioxidant, Masking, Skin Conditioning
Community Rating: Liked

Tocopherol (also known as Vitamin E) is a common antioxidant used to help protect the skin from free-radicals and strengthen the skin barrier. It's also fat soluble - this means our skin is great at absorbing it.

Vitamin E also helps keep your natural skin lipids healthy. Your lipid skin barrier naturally consists of lipids, ceramides, and fatty acids. Vitamin E offers extra protection for your skin’s lipid barrier, keeping your skin healthy and nourished.

Another benefit is a bit of UV protection. Vitamin E helps reduce the damage caused by UVB rays. (It should not replace your sunscreen). Combining it with Vitamin C can decrease sunburned cells and hyperpigmentation after UV exposure.

You might have noticed Vitamin E + C often paired together. This is because it is great at stabilizing Vitamin C. Using the two together helps increase the effectiveness of both ingredients.

There are often claims that Vitamin E can reduce/prevent scarring, but these claims haven't been confirmed by scientific research.

Learn more about Tocopherol

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 25.

Pureology Smooth Perfection Shampoo contains this as ingredient number 33.

20
What it does: Skin Conditioning
Community Rating: Very Disliked

Butyrospermum Parkii Butter is a plant lipid from the fruit of the Shea Tree. It is an effective skin hydrator and emollient.

Emollients help soothe and soften your skin. It does this by creating a protective film on your skin. This barrier helps trap moisture and keeps your skin hydrated. Emollients may be effective at treating dry or itchy skin.

Shea butter is rich in antioxidants. Antioxidants help fight free-radicals, or molecules that may harm the body. It is also full of fatty acids including stearic acid and linoleic acid. These acids help replenish the skin and keep skin moisturized.

While Shea Butter has an SPF rating of about 3-4, it is not a sunscreen replacement.

Shea butter may not be fungal acne safe. We recommend speaking with a professional if you have any concerns.

Learn more about Butyrospermum Parkii Butter

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 26.

Pureology Smooth Perfection Shampoo contains this as ingredient number 28.

21
What it does: Humectant, Masking, Skin Conditioning, Solvent
Community Rating: Mixed

Butylene Glycol (or BG) is used within cosmetic products for a few different reasons:

  • It is a solvent, meaning that it helps to dissolve other ingredients. This also enhances the absorption of the product into one's skin.
  • It is a humectant, which means that it helps attract moisture into the skin.
  • It helps improve product application.

Overall, Butylene Glycol is a safe and well-rounded ingredient. It is unlikely to irritate skin, and works well with pretty much all other ingredients.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 28.

Pureology Smooth Perfection Shampoo contains this as ingredient number 30.

22

We don't have a description for Hydrolyzed Vegetable Protein Pg-Propyl Silanetriol.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 29.

Pureology Smooth Perfection Shampoo contains this as ingredient number 40.

23
What it does: Emulsifying

We don't have a description for Laureth-9.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 30.

Pureology Smooth Perfection Shampoo contains this as ingredient number 31.

24
What it does: Humectant, Skin Conditioning, Skin Protecting, Solvent
Community Rating: Loved

Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.

A study from 2016 found glycerin to be more effective as a humectant than AHAs and hyaluronic acid.

As a humectant, it helps the skin stay hydrated by pulling moisture to your skin. The low molecular weight of glycerin allows it to pull moisture into the deeper layers of your skin.

Hydrated skin improves your skin barrier; Your skin barrier helps protect against irritants and bacteria.

Glycerin has also been found to have antimicrobial and antiviral properties. Due to these properties, glycerin is often used in wound and burn treatments.

In cosmetics, glycerin is usually derived from plants such as soybean or palm. However, it can also be sourced from animals, such as tallow or animal fat.

This ingredient is organic, colorless, odorless, and non-toxic.

Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.

Learn more about Glycerin

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 31.

Pureology Smooth Perfection Shampoo contains this as ingredient number 32.

25
What it does: Cleansing, Emulsifying

We don't have a description for C12-13 Pareth-23.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 32.

Pureology Smooth Perfection Shampoo contains this as ingredient number 34.

26
What it does: Perfuming, Preservative, Solvent
Community Rating: Very Disliked

Benzyl Alcohol is most commonly used as a preservative. It also has a subtle, sweet smell. Small amounts of Benzyl Alcohol is not irritating and safe to use in skincare products. Most Benzyl Alcohol is derived from fruits such as apricots.

Benzyl Alcohol has both antibacterial and antioxidant properties. These properties help lengthen the shelf life of products. Benzyl Alcohol is a solvent and helps dissolve other ingredients. It can also improve the texture and spreadability.

Alcohol comes in many different forms. Different types of alcohol will have different effects on skin. This ingredient is an astringent alcohol.

Using high concentrations of these alcohols are drying on the skin. They may strip away your skin's natural oils and even damage your skin barrier. Astringent alcohols may also irritate skin.

Other types of astringent alcohols include:

According to the National Rosacea Society based in the US, you should be mindful of products with these alcohols in the top half of ingredients.

Any type of sanitizing product will have high amounts of alcohol to help kill bacteria and viruses.

Learn more about Benzyl Alcohol

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 33.

Pureology Smooth Perfection Shampoo contains this as ingredient number 43.

27
What it does: Emulsifying

We don't have a description for C12-13 Pareth-3.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 34.

Pureology Smooth Perfection Shampoo contains this as ingredient number 35.

28
What it does: Emulsifying

We don't have a description for Trideceth-12.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 35.

Pureology Smooth Perfection Shampoo contains this as ingredient number 36.

29
What it does: Skin Conditioning

Helianthus Annuus Seed Extract comes from sunflower seeds.

Sunflower seeds are rich in vitamin E. Studies show sunflowers contain antimicrobial and antioxidant properties.

The fatty acids found in sunflower seeds include (from highest amount to least): linoleic acid, myristic acid, palmitic acid, stearic acid, arachidic acid, oleic acid, and linolenic acid.

These fatty acids hydrate your skin. Emollients create a film on the skin to prevent moisture from escaping.

Learn more about Helianthus Annuus Seed Extract

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 36.

Pureology Smooth Perfection Shampoo contains this as ingredient number 39.

30
What it does:

We don't have a description for Magnesium Nitrate.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 37.

Pureology Smooth Perfection Shampoo contains this as ingredient number 41.

31
What it does: Preservative
Community Rating: Very Disliked

Phenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent germ and microbial growth. By itself, it has a scent that is similar to that of a rose.

It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 38.

Pureology Smooth Perfection Shampoo contains this as ingredient number 42.

32
What it does: Masking, Preservative, Skin Conditioning
Community Rating: Liked

Salicylic Acid (also known as beta hydroxy acid or BHA) is one of the most well-known ingredients for treating skin that struggles with blackheads and acne. It helps to exfoliate both the skin's surface and pores, and also acts as an anti-inflammatory agent.

This multitasking property makes it a great ingredient for cleaning out pores, controlling oil production, and reducing inflammation.

Unlike AHAs which are water soluble, Salicylic Acid is oil soluble. This means that it's able to exfoliate the inside of pores and reduce blackheads.

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 a Salicylic Acid into your routine.

In general, Salicylic Acid is a great ingredient for oily acne-prone skin.

While salicylic acid does not increase sun-sensitivity, we still recommend wearing SPF.

If you are looking for the ingredient called BHA or Butylated Hydroxyanisole, click here.

Learn more about Salicylic Acid

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 40.

Pureology Smooth Perfection Shampoo contains this as ingredient number 37.

33
What it does: Preservative
Community Rating: Very Disliked

MCI is a preservative and known skin-irritant. It has anti-bacteria anti-fungal properties.

Studies spanning several decades have shown this ingredient to cause skin irritation and allergies.

MCI is commonly combined with methylisothiazolinone (MI). Other names for this mixture include Kathon CG and Euxyl K 100.

The use of this ingredient varies around the world:

Learn more about Methylchloroisothiazolinone

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 42.

Pureology Smooth Perfection Shampoo contains this as ingredient number 47.

34
What it does: Preservative
Community Rating: Disliked

Potassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.

Potassium sorbate is potassium salt derived from sorbic acid. Sorbic acid is a natural antibiotic and effective against fungus.

Potassium sorbate and sorbic acid can be found in baked goods, cheeses, dried meats, dried fruit, ice cream, pickles, wine, yogurt, and more.

Potassium sorbate is often used with stronger preservatives.

Learn more about Potassium Sorbate

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 44.

Pureology Smooth Perfection Shampoo contains this as ingredient number 52.

35
What it does: Preservative
Community Rating: Very Disliked

Sorbic Acid is a preservative. It is the most commonly used food preservative in the world.

Sorbic Acid is a natural antibiotic and highly effective at preventing the growth of fungus. It is less effective against bacteria.

Potassium Sorbate, another commonly-used preservative, is the potassium salt of Sorbic Acid.

Sorbic Acid may worsen eczema. We recommend speaking with a professional if you have any concerns.

Potassium sorbate and sorbic acid can be found in baked goods, cheeses, dried meats, dried fruit, ice cream, pickles, wine, yogurt, and more.

Learn more about Sorbic Acid

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 45.

Pureology Smooth Perfection Shampoo contains this as ingredient number 48.

36
What it does:
Community Rating: Mixed

We don't have a description for Magnesium Chloride.

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 46.

Pureology Smooth Perfection Shampoo contains this as ingredient number 49.

37
What it does: Preservative
Community Rating: Very Disliked

MI is a preservative and known skin irritant. In the past, MI was used for its ability to prevent bacteria, yeast, and fungi growth in low doses.

Nowadays, you'll most likely see MI combined with Methylchloroisothiazolinone (MCI). Trade names for this combination include Kathon CG or Euxyl K 100.

Since then, numerous studies have shown this ingredient to cause contact dermatitis, or skin irritation.

The use of this ingredient varies around the world:

Learn more about Methylisothiazolinone

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 47.

Pureology Smooth Perfection Shampoo contains this as ingredient number 51.

38
What it does: Buffering, Masking
Community Rating: Disliked

Citric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).

If you spot Citric Acid near the end of an ingredient list, it's likely there as a pH adjuster rather than an active ingredient.

As an AHA, Citric Acid removes the top layer of skin cells from the newer layer of skin underneath. This helps skin to remove dark spots and look more even.

Read more about some other popular AHA's here:

Learn more about Citric Acid

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 51.

Pureology Smooth Perfection Shampoo contains this as ingredient number 15.

39
What it does: Buffering
Community Rating: Mixed

Sodium 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 Hydroxide

Pureology Nanoworks Gold Hydrating Shampoo contains this as ingredient number 52.

Pureology Smooth Perfection Shampoo contains this as ingredient number 13.

Here's what our community thinks of the ingredients in these two products.

15% are loved or liked
13% have mixed ratings
48% are disliked or very disliked
23% have no rating yet
9% are loved or liked
11% have mixed ratings
53% are disliked or very disliked
26% have no rating yet

Usage

Here's some more info on how this product is used by our community.

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