Here's our complete breakdown comparing the ingredients, attributes, and more of The Ordinary Multi-Peptide Serum for Hair Density versus Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair .
Last updated on October 25, 2023. Published on June 07, 2023
Overview
What they are
These products are both vegan, cruelty-free, and reef safe . 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
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that need an update? Let us know.
Hair Loss
Products to help treat hair loss and thinning hair.
Hair Serum
Liquid-based hair treatment to help nourish the hair.
Price
Ingredient Info
The Ordinary Multi-Peptide Serum for Hair Density 36 ingredients
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair 28 ingredients
Alcohol Free
This product is free of harsh alcohols 🎉
Silicon Free
This product is free of silicons 🎉
Fragrance Free
This product is free of fragrances 🎉
Sulfate Free
This product is free of sulfates 🎉
Paraben Free
This product is free of parabens 🎉
Contains Oils
Ingredients in this product that are types of oil:
Not Malassezia Safe
Ingredients in this product that are not malassezia safe:
Reef Safe
This product is free of ingredients that damage reefs 🎉
EU Allergen Free
This product is free of EU allergens 🎉
Vegan
This product is vegan 🎉
Cruelty Free
This product is cruelty-free 🎉
Alcohol Free
This product is free of harsh alcohols 🎉
Silicon Free
This product is free of silicons 🎉
Sulfate Free
This product is free of sulfates 🎉
Paraben Free
This product is free of parabens 🎉
Oil Free
This product is free of oils 🎉
Not Malassezia Safe
Ingredients in this product that are not malassezia safe:
Reef Safe
This product is free of ingredients that damage reefs 🎉
Vegan
This product is vegan 🎉
Cruelty Free
This product is cruelty-free 🎉
At a glance
Click on any of the items below to learn more
The Ordinary Multi-Peptide Serum for Hair Density 36 ingredients
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair 28 ingredients
Notable Ingredients
This product contains 1 ingredient that may have this attribute:
This product contains 1 ingredient that may have this attribute:
This product contains 2 ingredients that may have this attribute:
Benefits
This product contains 1 ingredient that may have this attribute:
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This product contains 1 ingredient that may have this attribute:
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This product contains 1 ingredient that may have this attribute:
This product contains 2 ingredients that may have this attribute:
This product contains 1 ingredient that may have this attribute:
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Concerns
This product contains 1 ingredient that may have this attribute:
This product contains 1 ingredient that may have this attribute:
This product contains 1 ingredient that may have this attribute:
Notable Ingredients
This product contains 2 ingredients that may have this attribute:
This product contains 1 ingredient that may have this attribute:
This product contains 1 ingredient that may have this attribute:
Benefits
This product contains 2 ingredients that may have this attribute:
This product contains 1 ingredient that may have this attribute:
This product contains 1 ingredient that may have this attribute:
This product contains 1 ingredient that may have this attribute:
This product contains 3 ingredients that may have this attribute:
Concerns
This product contains 1 ingredient that may have this attribute:
This product contains 1 ingredient that may have this attribute:
This product contains 1 ingredient that may have this attribute:
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Join SkinSortIngredients Compared
Ingredients that are highlighted in purple are present in both products.
The Ordinary Multi-Peptide Serum for Hair Density 36 ingredients
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair 28 ingredients
Water • Propanediol • Butylene Glycol • Glycerin • Caffeine • Biotinoyl Tripeptide-1 • Acetyl Tetrapeptide-3 • Larix Europaea Wood Extract • Pisum Sativum Extract • Scutellaria Baicalensis Root Extract • Triticum Vulgare Germ Extract • Glycine Soja Germ Extract • Trifolium Pratense Flower Extract • Camellia Sinensis Leaf Extract • Apigenin • Oleanolic Acid • Arginine • Glycine • Calcium Gluconate • Zinc Chloride • Lactic Acid • Gluconolactone • Dextran • Maltodextrin • Hydroxyethylcellulose • Xanthan Gum • Pentylene Glycol • Dimethyl Isosorbide • Polysorbate 20 • Ppg-26-Buteth-26 • Peg-40 Hydrogenated Castor Oil • Trisodium Ethylenediamine Disuccinate • Sodium Metabisulfite • Sodium Benzoate • Phenoxyethanol • Chlorphenesin
Water • Polysorbate 20 • Butylene Glycol • Glycerin • Polyquaternium-7 • Rhodiola Rosea Extract • Sodium Hyaluronate • Tocopheryl Acetate • Acetyl Tetrapeptide-3 • Tocopherol • Rosa Centifolia Flower Extract • Dextran • Trifolium Pratense Flower Extract • Acanthopanax Senticosus Root Extract • Rhaponticum Carthamoides Root Extract • Inonotus Obliquus Extract • Selaginella Lepidophylla Extract • Ethylhexylglycerin • Disodium EDTA • Sodium Hydroxide • Acrylates/C10-30 Alkyl Acrylate Crosspolymer • Citric Acid • Sodium Benzoate • Phenoxyethanol • Parfum • Eugenol • Limonene • Linalool
Ingredients Side-by-side
Ingredients that are highlighted in purple are present in both products.
Learn more about what what Com. / Irr. ratings are
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
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 WaterThe Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 1.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 1.
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.
The Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 3.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 3.
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 GlycerinThe Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 4.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 4.
Acetyl Tetrapeptide-3 is a peptide.
The Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 7.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 9.
Trifolium Pratense Flower Extract can help to reduce large pores.
The Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 13.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 13.
We don't have a description for Dextran.
The Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 23.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 12.
Polysorbate 20 is made by combining ethoxylation of sorbitan, ethylene oxide, and lauric acid. It is a mild cleansing agent, surfactant, and emulsifier.
As a surfactant, it helps collect dirt and oils for washing. Emulsifiers prevent oils and water from separating.
Polysorbate 20 also adds scent to a product. Since it is made using sorbitol, it has a sweet scent. Sorbitol can also be found in fruits such as apples and peaches.
The lauric acid used to create Polysorbate 20 is often derived from coconuts.
Polysorbate 20 may not be fungal acne safe.
Learn more about Polysorbate 20The Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 29.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 2.
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 BenzoateThe Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 34.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 23.
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.
The Ordinary Multi-Peptide Serum for Hair Density contains this as ingredient number 35.
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair contains this as ingredient number 24.
Here's what our community thinks of the ingredients in these two products.
The Ordinary Multi-Peptide Serum for Hair Density 36 ingredients
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair 28 ingredients
Usage
Here's some more info on how this product is used by our community.
When to use
The Ordinary Multi-Peptide Serum for Hair Density 36 ingredients
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair 28 ingredients
Reviews
Here's what our community thinks
Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair 28 ingredients
Alternatives
Our Dupe Finder has found 3 potential alternatives that have similar ingredients to The Ordinary Multi-Peptide Serum for Hair Density.
See 3 alternativesOur Dupe Finder has found 2 potential alternatives that have similar ingredients to Ouai Hydrating Scalp Serum for Healthy, Fuller Looking Hair.
See 2 alternatives
