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Curlsmith Full Lengths Density Elixir Scalp Serum Versus Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair

Hair Serum
Hair Serum
American Brand United States
American Brand United States

Overview

What they are

These products are both vegan, cruelty-free, and reef safe hair serums. They have a total of 9 ingredients in common

Cool Features

They both contain peptides

Suited For

They're both likely to be good for anti aging, dry skin, brightening skin, reducing pores and scar healing

Free From

They both do not contain any harsh alcohols, parabens, silicones or sulfates

What's Inside

They both contain common allergens and fragrances

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

Click any item below to learn more and see relevant ingredients

At a glance

Click on any of the items below to learn more

Notable Ingredients

Benefits

Concerns

Notable Ingredients

Benefits

Concerns

Ingredients Side-by-side

found in both products
Full Lengths Density Elixir Scalp Serum
Water Skin Conditioning, Solvent

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.

Propanediol Solvent

Propanediol helps absorb ingredients into your skin, boosting their benefits. It can act as an emollient, making your skin softer. Propanediol can help products last longer by boosting the properties of preservatives within the formulation.

Glycerin Humectant, Skin Conditioning, Skin Protecting
0 / 0 Helps hydrate Dry Skin IconHelps brighten skin Icon
2 Benefits

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

0 Com. / 0 Irr.
Larix Europaea Wood Extract Humectant, Skin Conditioning

Larix Europaea is a larch tree native to Europe.

Unknown Full details ->
Glycine Soja Germ Extract Emollient, Skin Conditioning

We don't have a description for Glycine Soja Germ Extract.

Unknown Full details ->
Pisum Sativum Sprout Extract Skin Conditioning

We don't have a description for Pisum Sativum Sprout Extract.

Unknown Full details ->
Scutellaria Baicalensis Root Extract Astringent, Humectant, Soothing
Good for Scar Healing Icon
Good for Scar HealingGood for Scar Healing Icon

Scutellaria Baicalensis Root Extract comes from the Baikal skullcap or Chinese skullcap plant. This plant is native to Northeast Asia and can be found in China, Mongolia, Korea, and Siberia.

Camellia Sinensis Leaf Extract Antimicrobial, Antioxidant, Astringent
Antioxidant IconHelps reduce Skin Redness IconHelps reduce irritation IconGood for Minimizing Pores IconHelps with Anti-Aging IconHelps fight Acne Icon
AntioxidantAntioxidant Icon 5 Benefits

Camellia Sinensis Leaf Extract is derived from the leaves of the tea plant. Black tea, green tea, and oolong tea are all harvested from this plant.

Phyllanthus Emblica Fruit Extract Humectant, Skin Conditioning

We don't have a description for Phyllanthus Emblica Fruit Extract.

Unknown Full details ->
Hamamelis Virginiana Leaf Extract Skin Conditioning

Hamamelis Virginiana Leaf Extract comes from the witch hazel plant.

Disliked Full details ->
Lavandula Angustifolia Flower Extract Cleansing, Masking, Refreshing
EU Allergen Icon
EU AllergenEU Allergen Icon

Lavandula Angustifolia Flower Extract comes from the lavender plant. Lavender extract has anti-inflammatory and antioxidant properties.

Very Disliked Full details ->
Thymus Vulgaris Leaf Extract Skin Protecting

We don't have a description for Thymus Vulgaris Leaf Extract.

Unknown Full details ->
Cedrus Atlantica Bark Extract Perfuming, Skin Conditioning
Fragrance IconEU Allergen Icon
FragranceFragrance Icon EU AllergenEU Allergen Icon

Cedrus Atlantica Bark Extract is a fragrance.

Unknown Full details ->
Peg-40 Hydrogenated Castor Oil Emulsifying
Oil IconNot safe for Fungal Acne Icon
OilOil Icon Not safe for Fungal AcneNot safe for Fungal Acne Icon

Peg-40 Hydrogenated Castor Oil is derived from castor oil and polyethylene glycol (PEG). It is used as a emollient and emulsifier.

Very Disliked Full details ->
Trifolium Pratense Flower Extract Astringent, Masking
Good for Minimizing Pores Icon
Good for Minimizing PoresGood for Minimizing Pores Icon

Trifolium Pratense Flower Extract can help to reduce large pores.

Unknown Full details ->
Triticum Vulgare Germ Extract Skin Conditioning, Skin Protecting

This ingredient is extracted from the germ part of the wheat plant. The germ of a plant refers to the seed embryo, or part that sprouts into a new plant.

Sodium Citrate Buffering, Masking

Sodium Citrate is the sodium salts of citric acid. In skincare, it is used to alter pH levels and acts as a preservative.

Citric Acid Buffering, Masking
AHA IconGood for Skin Texture IconGood for Minimizing Pores IconGood for Scar Healing IconHelps brighten skin IconMay cause irritation IconMay worsen Rosacea Icon
AHAAHA Icon 4 Benefits 2 Concerns

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

Disliked Full details ->
Butylene Glycol Humectant, Masking, Skin Conditioning
1 / 0

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

1 Com. / 0 Irr.
Glycine Buffering, Skin Conditioning

Glycine is an amino acid that helps build proteins. It is already present in our skin as our bodies produce them naturally.

Arginine Masking, Skin Conditioning
Not safe for Fungal Acne Icon
Not safe for Fungal AcneNot safe for Fungal Acne Icon

Arginine is an amino acid that is important for human development. Your body uses is it to produce hair keratin and skin collagen.

Ppg-26-Buteth-26 Skin Conditioning

We don't have a description for Ppg-26-Buteth-26.

Disliked Full details ->
Gluconolactone Skin Conditioning
PHA IconGood for Skin Texture IconHelps with Anti-Aging Icon
PHAPHA Icon 2 Benefits

Gluconolactone is a PHA. PHAs are a great gentle alternative to traditional AHAs.

Dextran

We don't have a description for Dextran.

Unknown Full details ->
Apigenin Antioxidant
Antioxidant Icon
AntioxidantAntioxidant Icon

Apigenin is an antioxidant.

Unknown Full details ->
Acetyl Tetrapeptide-3 Skin Protecting
Peptide Icon
PeptidePeptide Icon

Acetyl Tetrapeptide-3 is a peptide.

Oleanolic Acid Skin Conditioning

Oleanolic acid is a type of triterpene.

Unknown Full details ->
Biotinoyl Tripeptide-1
Peptide Icon
PeptidePeptide Icon

Biotinoyl Tripeptide-1 is a peptide.

Calcium Gluconate Humectant, Skin Conditioning

We don't have a description for Calcium Gluconate.

Unknown Full details ->
Sodium Benzoate Masking, Preservative
Preservative Icon
PreservativePreservative Icon

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.

Disliked Full details ->
Potassium Sorbate Preservative
Preservative Icon
PreservativePreservative Icon

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

Disliked Full details ->
Zinc Chloride Soothing

We don't have a description for Zinc Chloride.

Unknown Full details ->
Sodium Metabisulfite Antioxidant, Preservative
Antioxidant IconPreservative Icon
AntioxidantAntioxidant Icon PreservativePreservative Icon

Sodium Metabisulfite is an antioxidant and is a preservative.

Lactic Acid Buffering, Humectant, Skin Conditioning
AHA IconGood for Skin Texture IconGood for Minimizing Pores IconHelps with Anti-Aging IconGood for Dark Spots IconGood for Scar Healing IconHelps brighten skin IconMay cause irritation IconMay worsen Eczema IconMay worsen Rosacea Icon
AHAAHA Icon 6 Benefits 3 Concerns

Lactic Acid is an AHA that is derived from fermenting lactose, a carbohydrate from milk. It removes the top layer of old and dead skin cells and helps increase cell turnover.

Phenoxyethanol Preservative
Preservative Icon
PreservativePreservative Icon

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

Very Disliked Full details ->
Hydrating Scalp Serum for Healthy, Fuller Looking Hair
Water Skin Conditioning, Solvent

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.

Polysorbate 20 Emulsifying
0 / 0 Not safe for Fungal Acne Icon
Not safe for Fungal AcneNot safe for Fungal Acne Icon

Polysorbate 20 is made by combining ethoxylation of sorbitan, ethylene oxide, and lauric acid. It is a mild cleansing agent, surfactant, and emulsifier.

0 Com. / 0 Irr.
Very Disliked Full details ->
Butylene Glycol Humectant, Masking, Skin Conditioning
1 / 0

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

1 Com. / 0 Irr.
Glycerin Humectant, Skin Conditioning, Skin Protecting
0 / 0 Helps hydrate Dry Skin IconHelps brighten skin Icon
2 Benefits

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

0 Com. / 0 Irr.
Polyquaternium-7

Polyquaternium-7 is a light to clear colored liquid. It is commonly found in haircare products for its film-forming and anti-static properties.

Unknown Full details ->
Rhodiola Rosea Extract Emollient

We don't have a description for Rhodiola Rosea Extract.

Unknown Full details ->
Sodium Hyaluronate Humectant, Skin Conditioning
0 / 0 Hyaluronic Acid Icon
Hyaluronic AcidHyaluronic Acid Icon

Sodium Hyaluronate is hyaluronic acid's salt form. It is commonly derived from the sodium salt of hyaluronic acid.

0 Com. / 0 Irr.
Tocopheryl Acetate Antioxidant, Skin Conditioning
0 / 0 Vitamin E IconAntioxidant IconHelps brighten skin Icon
Vitamin EVitamin E Icon AntioxidantAntioxidant Icon Helps brighten skinHelps brighten skin Icon

Tocopheryl Acetate is AKA Vitamin E. It is an antioxidant and protects your skin from free radicals. Free radicals damage the skin by breaking down collagen.

0 Com. / 0 Irr.
Acetyl Tetrapeptide-3 Skin Protecting
Peptide Icon
PeptidePeptide Icon

Acetyl Tetrapeptide-3 is a peptide.

Tocopherol Antioxidant, Masking, Skin Conditioning
0-3 / 0-3 Vitamin E IconAntioxidant IconHelps hydrate Dry Skin IconHelps with Anti-Aging IconGood for Scar Healing IconHelps brighten skin IconMay cause irritation Icon
Vitamin EVitamin E Icon AntioxidantAntioxidant Icon 4 Benefits May cause irritationMay cause irritation Icon

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.

0-3 Com. / 0-3 Irr.
Rosa Centifolia Flower Extract Astringent, Masking, Skin Conditioning

We don't have a description for Rosa Centifolia Flower Extract.

Unknown Full details ->
Dextran

We don't have a description for Dextran.

Unknown Full details ->
Trifolium Pratense Flower Extract Astringent, Masking
Good for Minimizing Pores Icon
Good for Minimizing PoresGood for Minimizing Pores Icon

Trifolium Pratense Flower Extract can help to reduce large pores.

Unknown Full details ->
Acanthopanax Senticosus Root Extract Skin Conditioning, Soothing

We don't have a description for Acanthopanax Senticosus Root Extract.

Unknown Full details ->
Rhaponticum Carthamoides Root Extract Skin Conditioning

We don't have a description for Rhaponticum Carthamoides Root Extract.

Unknown Full details ->
Inonotus Obliquus Extract Skin Conditioning

We don't have a description for Inonotus Obliquus Extract.

Selaginella Lepidophylla Extract Emollient

We don't have a description for Selaginella Lepidophylla Extract.

Unknown Full details ->
Ethylhexylglycerin Skin Conditioning

Ethylhexylglycerin (we can't pronounce this either) is commonly used as a preservative and skin softener. It is derived from glyceryl.

Disodium EDTA

Disodium EDTA plays a role in making products more stable by aiding other preservatives.

Disliked Full details ->
Sodium Hydroxide Buffering

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.

Acrylates/C10-30 Alkyl Acrylate Crosspolymer Emulsion Stabilising

Acrylates/C10-30 Alkyl Acrylate Crosspolymer is a synthetic polymer. It is used to thicken and improve the texture of products.

Disliked Full details ->
Citric Acid Buffering, Masking
AHA IconGood for Skin Texture IconGood for Minimizing Pores IconGood for Scar Healing IconHelps brighten skin IconMay cause irritation IconMay worsen Rosacea Icon
AHAAHA Icon 4 Benefits 2 Concerns

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

Disliked Full details ->
Sodium Benzoate Masking, Preservative
Preservative Icon
PreservativePreservative Icon

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.

Disliked Full details ->
Phenoxyethanol Preservative
Preservative Icon
PreservativePreservative Icon

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

Very Disliked Full details ->
Parfum Masking, Perfuming
Fragrance IconMay worsen Eczema IconMay worsen Rosacea Icon
FragranceFragrance Icon 2 Concerns

Parfum is a catch-all term for an ingredient or more that is used to give a scent to products.

Very Disliked Full details ->
Eugenol Perfuming, Tonic
Fragrance IconMay cause irritation IconEU Allergen Icon
FragranceFragrance Icon 2 Concerns

Eugenol is naturally found in cloves, basil, and bay leaves. It is an aromatic oil used to add fragrance to a product. The scent of eugenol is described as "clove-like". Eugenol is a known EU allergen, meaning it causes contact allergies.

Very Disliked Full details ->
Limonene Perfuming, Solvent
Fragrance Icon
FragranceFragrance Icon

Limonene is a fragrance that adds scent and taste to a formulation.

Very Disliked Full details ->
Linalool Perfuming
Fragrance IconMay cause irritation IconEU Allergen Icon
FragranceFragrance Icon 2 Concerns

Linalool is a fragrance and helps add scent to products. It's derived from common plants such as cinnamon, mint, citrus, and lavender.

Very Disliked Full details ->

Ingredients Explained

These ingredients are found in both products.

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

Skin Conditioning, Solvent
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. If you see this, drink a glass of water. Stay hydrated!

Learn more about Water
Humectant, Skin Conditioning, Skin Protecting
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
Astringent, Masking

Trifolium Pratense Flower Extract can help to reduce large pores.

Buffering, Masking
Disliked

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

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 even out skin tone.

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.

Read more about some other popular AHA's here:

Learn more about Citric Acid
Humectant, Masking, Skin Conditioning
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.

We don't have a description for Dextran.

Skin Protecting
Loved

Acetyl Tetrapeptide-3 is a peptide.

Masking, Preservative
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
Preservative
Very Disliked

Phenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent 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.

Ingredient Ratings

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

Full Lengths Density Elixir Scalp Serum
11
4
8
12
liked
mixed
disliked
not rated
Hydrating Scalp Serum for Healthy, Fuller Looking Hair
7
3
10
8
liked
mixed
disliked
not rated

When to use

2 Routines
50% use in am
50% use in pm
100% use every day
5 Routines
20% use in am
80% use in pm
80% use every day