Rationale #4 The Cleanser

Rationale #4 The Cleanser

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Overview

What it is

Face cleanser with 66 ingredients that contains ceramides and Vitamin E

Cool Features

It is reef safe

Suited For

It has ingredients that are good for fighting acne, anti aging, dry skin, brightening skin, sensitive skin, oily skin and scar healing

Free From

It doesn't contain any harsh alcohols, parabens, silicones or sulfates

Fun facts

Rationale is from Australia. This product is used in 4 routines created by our community.

We independently verify ingredients and our claims are backed by peer-reviewed research. Does this product need an update? Let us know.

What's inside (and what isn't)

Ingredients List

Dive into the full list of ingredients.

34
15
17

Water

Skin Conditioning

Propanediol

Solvent
Helps hydrate Dry Skin Icon

Cetearyl Alcohol

Emollient
2 / 1 Fatty Alcohol IconMay worsen Oily Skin IconBad for Acne Prone Skin IconNot safe for Fungal Acne Icon

Ceteareth-20

Cleansing
2 / 3 May worsen Oily Skin Icon

Glycerin

Humectant
0 / 0 Helps hydrate Dry Skin IconGood for Scar Healing IconHelps brighten skin Icon

1,2-Hexanediol

Skin Conditioning
Helps hydrate Dry Skin Icon

Citrus Aurantium Dulcis Peel Oil

Masking
Oil Icon

Tocopherol

Antioxidant
0-3 / 0-3 Vitamin E IconAntioxidant IconHelps hydrate Dry Skin IconHelps with Anti-Aging IconGood for Scar Healing Icon

Aloe Barbadensis Leaf Juice

Skin Conditioning
Helps hydrate Dry Skin IconHelps reduce Skin Redness IconHelps reduce irritation Icon

Tocotrienols

Skin Conditioning

Caprylhydroxamic Acid

Helianthus Annuus Seed Oil

Emollient
0 / 0 Oil IconHelps hydrate Dry Skin IconNot safe for Fungal Acne Icon

Santalum Spicatum Seed Oil

Skin Conditioning
Oil Icon

Butylene Glycol

Humectant
1 / 0 Helps hydrate Dry Skin Icon

Elaeis Guineensis Oil

Emollient
Oil IconHelps hydrate Dry Skin IconNot safe for Fungal Acne Icon

Mica

Cosmetic Colorant
May worsen Eczema Icon

7-Dehydrocholesterol

Emulsion Stabilising

Ceteareth-25

Cleansing

Pentylene Glycol

Skin Conditioning

Magnesium Aspartate

Skin Conditioning

Zinc Gluconate

Skin Conditioning
Helps fight Acne Icon

Ethylhexylglycerin

Skin Conditioning

Phenoxyethanol

Preservative
Preservative Icon

Cetyl Alcohol

Emollient
2 / 2 Fatty Alcohol Icon

Banksia Serrata Flower Extract

Skin Conditioning

Barklya Syringifolia Flower/Leaf Extract

Antioxidant
Antioxidant Icon

Brachychiton Acerifolius Flower Extract

Antioxidant
Antioxidant Icon

Citrus Australasica Fruit Extract

Antioxidant
Antioxidant Icon

Davidsonia Pruriens Fruit Extract

Antioxidant
Antioxidant Icon

Hibiscus Sabdariffa Flower Extract

Skin Conditioning

Melaleuca Alternifolia Leaf Extract

Perfuming
Fragrance Icon

Santalum Acuminatum Fruit Extract

Antioxidant
Antioxidant Icon

Tasmannia Lanceolata Fruit Extract

Skin Conditioning

Telopea Speciosissima Flower/Leaf Extract

Antioxidant
Antioxidant Icon

Terminalia Ferdinandiana Fruit Extract

Antioxidant
Antioxidant Icon

Citric Acid

Buffering
AHA IconGood for Oily Skin IconGood for Skin Texture IconGood for Minimizing Pores IconGood for Scar Healing IconHelps brighten skin IconMay worsen Rosacea Icon

Behenic Acid

Cleansing
0 / 0 Helps hydrate Dry Skin IconNot safe for Fungal Acne Icon

Ceramide NP

Skin Conditioning
Ceramide IconHelps hydrate Dry Skin IconHelps reduce irritation IconHelps with Anti-Aging Icon

Cholesterol

Emollient
0 / 0 Helps hydrate Dry Skin Icon

Copper Gluconate

Skin Conditioning
Good for Scar Healing Icon

Potassium Sorbate

Preservative
Preservative Icon

Ceramide Ns

Skin Conditioning
Ceramide IconHelps hydrate Dry Skin IconHelps reduce irritation IconHelps with Anti-Aging Icon

Glycine

Buffering
Helps hydrate Dry Skin Icon

Sodium Benzoate

Masking
Preservative Icon

Serine

Masking
Helps hydrate Dry Skin Icon

Glutamic Acid

Humectant
Helps reduce Skin Redness IconHelps reduce irritation IconGood for Scar Healing Icon

Ceramide AP

Skin Conditioning
Ceramide IconHelps hydrate Dry Skin IconHelps reduce irritation IconHelps with Anti-Aging Icon

Ceramide EOP

Skin Conditioning
Ceramide IconHelps hydrate Dry Skin IconHelps reduce irritation IconHelps with Anti-Aging Icon

Ceramide Eos

Skin Conditioning
Ceramide IconHelps hydrate Dry Skin IconHelps reduce irritation IconHelps with Anti-Aging Icon

Aspartic Acid

Masking
Helps hydrate Dry Skin Icon

Leucine

Skin Conditioning

Caprooyl Phytosphingosine

Skin Conditioning
Helps hydrate Dry Skin Icon

Caprooyl Sphingosine

Skin Conditioning

Alanine

Masking

Lysine

Skin Conditioning

Arginine

Masking
Good for Scar Healing IconNot safe for Fungal Acne Icon

Tyrosine

Masking

Phenylalanine

Masking
Helps hydrate Dry Skin IconGood for Scar Healing Icon

Proline

Skin Conditioning

Threonine

Helps hydrate Dry Skin Icon

Valine

Masking

Isoleucine

Skin Conditioning

Histidine

Humectant
Helps hydrate Dry Skin IconHelps with Anti-Aging IconGood for Scar Healing Icon

Limonene

Perfuming
Fragrance IconMay cause irritation IconEU Allergen IconMay worsen Eczema IconMay worsen Rosacea Icon

CI 77891

Cosmetic Colorant

CI 77491

Cosmetic Colorant

Key Ingredients

Benefits

Concerns

Ingredients Explained

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.

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
Solvent

Propanediol is an all-star ingredient. It softens, hydrates, and smooths the skin. 

It’s often used to:

Propanediol is not likely to cause sensitivity and considered safe to use. It is derived from corn or petroleum with a clear color and no scent.

Learn more about Propanediol
Emollient, Emulsifying, Emulsion Stabilising

Cetearyl alcohol is a mixture of two fatty alcohols: cetyl alcohol and stearyl alcohol. It is mainly used as an emulsifier. Emulsifiers help prevent the separation of oils and products. Due to its composition, it can also be used to thicken a product or help create foam.

Cetearyl alcohol is an emollient. Emollients help soothe and hydrate the skin by trapping moisture.

Studies show Cetearyl alcohol is non-toxic and non-irritating. The FDA allows products labeled "alcohol-free" to have fatty alcohols.

This ingredient is usually derived from plant oils such as palm, vegetable, or coconut oils. There is debate on whether this ingredient will cause acne.

Due to the fatty acid base, this ingredient may not be Malassezia folliculitis safe.

Learn more about Cetearyl Alcohol
Cleansing, Emulsifying

Ceteareth-20 is an emulsifier and cleansing agent. It is derived from cetearyl alcohol, a fatty alcohol.

As an emulsifier, Ceteareth-20 prevents oil and water from separating. It is also a surfactant. Surfactants help gather oil, pollution, and dirt to be washed away.

Humectant, Skin Conditioning, Skin Protecting

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
Skin Conditioning, Solvent

1,2-Hexanediol is a synthetic liquid and another multi-functional powerhouse. 

It is a:

  • Humectant, drawing moisture into the skin
  • Emollient, helping to soften skin
  • Solvent, dispersing and stabilizing formulas
  • Preservative booster, enhancing the antimicrobial activity of other preservatives 
Masking, Skin Conditioning

Citrus Aurantium Dulcis Peel Oil is oil from the peel of an orange fruit.

Limonene and linalool make up the majority of oils from citrus peels. Limonene has a "citrus" fragrance. Citrus peels also contain flavonoids, which have anti-inflammatory properties.

Citrus peel is also a rich source of flavonoids. Flavonoids are natural antioxidants and help protect your skin against damage. Flavonoids are a group of compounds naturally found in vegetables and fruits.

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 Citrus Aurantium Dulcis Peel Oil
Antioxidant, Masking, Skin Conditioning

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
Skin Conditioning

Aloe Barbadensis Leaf Juice comes from leaves of the aloe plant. Aloe Barbadensis Leaf Juice is best known for helping to soothe sunburns. It is also anti-inflammatory, moisturizing, antiseptic, and can help heal wounds.

Aloe is packed with good stuff including Vitamins A, C, and E. These vitamins are antioxidants, which help fight free-radicals and the damage they may cause. Free-radicals are molecules that may damage your skin cells, such as pollution.

Aloe Barbadensis Leaf Juice also contains sugars. These sugars come in the form of monosaccharides and polysaccharides, folic acid, and choline. These sugars are able to help bind moisture to skin.

It also contains minerals such as calcium, 12 anthraquinones, fatty acids, amino acids, and Vitamin B12.

Learn more about Aloe Barbadensis Leaf Juice
Skin Conditioning, UV Absorber

We don't have a description for Tocotrienols yet.

Caprylhydroxamic Acid is a chelating agent.

Chelating agents help prevent metal ions from binding to other ingredients. This helps prevent unwanted reactions and effects from using the product.

Caprylhydroxamic Acid is often used with natural antimicrobial products as an alternative to preservatives.

Learn more about Caprylhydroxamic Acid
Emollient, Masking, Skin Conditioning

Helianthus Annuus Seed Oil is the oil derived from the seeds of a Sunflower. Sunflower seed oil is non-fragrant. It is an emollient, meaning it helps to soften the skin.

Sunflower seed oil contains many fatty acids. 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 help the skin create ceramides. Ceramides play a role in repairing the skin barrier.

Helianthus Annuus Seed Oil helps moisturize the skin. This in turn helps the skin look more rejuvenated and smoother.

Sunflowers are rich in vitamin E.

Historians believe Indigenous cultures of North America domesticated sunflowers before corn. Thus they relied on sunflower oil for a variety of uses. One such use is moisturizing skin and hair.

Sunflower seed oil may not be fungal acne safe. We recommend speaking with a professional if you have any concerns.

Learn more about Helianthus Annuus Seed Oil
Skin Conditioning

Santalum Spicatum Seed Oil is an oil.

Humectant, Masking, Skin Conditioning

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

Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.

Though this ingredient works well with most skin types, some people with sensitive skin may experience a reaction such as allergic rashes, closed comedones, or itchiness.

Learn more about Butylene Glycol

Elaeis Guineensis Oil comes from the African Palm tree. This tree is native to Western and Southwestern Africa.

This oil is rich in antioxidants such as Vitamin E. Antioxidants may help with anti-aging.

The Vitamin E and fatty acid content give palm oil a skin-hydrating property. Emollients help trap moisture in by creating a film on the skin.

Palm oil is created by either squeezing the fruit or crushing the kernel at the center of the fruit. In the 1800s, archaeologists discovered a 6000 year old Egyptian tomb containing palm oil.

Palm oil is controversial due to its social and environmental impacts. Several organizations are working to make palm oil harvest more sustainable, such as the RSPO.

Learn more about Elaeis Guineensis Oil
Cosmetic Colorant

Mica refers to a group of silicate minerals. Mica crystals are easily split to give products a shimmer. These crystals are able to reflect light to temporarily give your skin a glowy look.

Mica is found to be safe. Trace amounts of heavy metals may be found in mica, but these metals are not harmful in our personal products.

Mica has been used since prehistoric times throughout the world. Ancient Egyptian, Indian, Greek, Roman, Aztec, and Chinese civilizations have used mica.

Mica can be naturally found throughout the world. However, some sources of mica may be controversial. In 2016, mica mined in the Jharkhand state in India was found to be using child labor. However, companies are able to source ethical mica affiliated with international organizations that monitor the mica supply chain.

Learn more about Mica
Emulsion Stabilising, Skin Conditioning

We don't have a description for 7-Dehydrocholesterol yet.

Cleansing, Emulsifying

Ceteareth-25 comes from Cetearyl Alcohol. (And Cetearyl Alcohol is created from cetyl alcohol and stearyl alcohol.

This ingredient is a fatty alcohol used as an emulsifier and surfactant. As an emulsifier, it helps oil mix with water.

Like cetearyl alcohol, Ceteareth-25 can help thicken and create a gel-like consistency.

Learn more about Ceteareth-25
Skin Conditioning, Solvent

Pentylene glycol is typically used within a product to thicken it. It also adds a smooth, soft, and moisturizing feel to the product. It is naturally found in plants such as sugar beets.

The hydrophilic trait of Pentylene Glycol makes it a humectant. As a humectant, Pentylene Glycol helps draw moisture from the air to your skin. This can help keep your skin hydrated.

This property also makes Pentylene Glycol a great texture enhancer. It can also help thicken or stabilize a product.

Pentylene Glycol also acts as a mild preservative and helps to keep a product microbe-free.

Some people may experience mild eye and skin irritation from Pentylene Glycol. We always recommend speaking with a professional about using this ingredient in your routine.

Pentylene Glycol has a low molecular weight and is part of the 1,2-glycol family.

Learn more about Pentylene Glycol
Skin Conditioning

We don't have a description for Magnesium Aspartate yet.

Skin Conditioning

Zinc gluconate has antibacterial and wound healing properties. It is particularly effective against fighting inflammatory acne.

This ingredient is the zinc salt of the PHA gluconic acid. PHAs are gentle cousins to AHAs.

Skin Conditioning

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

You might see Ethylhexylglycerin often paired with other preservatives such as phenoxyethanol. Ethylhexylglycerin has been found to increase the effectiveness of these other preservatives.

Preservative

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.

Emollient, Emulsifying, Emulsion Stabilising

Cetyl Alcohol is a fatty alcohol. Fatty Alcohols are most often used as an emollient or to thicken a product.

Its main roles are:

Though it has "alcohol" in the name, it is not related to denatured alcohol or ethyl alcohol. The FDA allows products labeled "alcohol-free" to have fatty alcohols.

Learn more about Cetyl Alcohol
Skin Conditioning

We don't have a description for Banksia Serrata Flower Extract yet.

Antioxidant, Humectant, Skin Conditioning

Barklya Syringifolia Flower/Leaf Extract is an antioxidant.

Antioxidant, Skin Conditioning

Brachychiton Acerifolius Flower Extract is an antioxidant.

Antioxidant, Humectant, Skin Conditioning

Citrus Australasica Fruit Extract is an antioxidant.

Antioxidant, Humectant, Skin Conditioning

Davidsonia Pruriens Fruit Extract is an antioxidant.

This extract comes from the Roselle flower, or Hibiscus Sabdariffa. Roselle flowers are rich in antioxidants.

Studies found the antioxidants in Roselle flowers to potentially help reduce UV-B damage.

Perfuming, Skin Conditioning

Melaleuca Alternifolia Leaf Extract comes from the Tea Tree, Melaleuca alternifolia, Myrtaceae. This tea tree is native to Australia.

Tea Leaf extract contains antimicrobial and anti-acne properties.

This ingredient has perfuming properties and contains linalool and limonene. These fragrance and terpinen components can cause skin sensitivity.

Learn more about the benefits of Tea Tree Oil here.

Learn more about Melaleuca Alternifolia Leaf Extract
Antioxidant, Humectant

Santalum Acuminatum Fruit Extract is an antioxidant.

We don't have a description for Tasmannia Lanceolata Fruit Extract yet.

Antioxidant, Bleaching, Humectant

Telopea Speciosissima Flower/Leaf Extract is an antioxidant.

Terminalia Ferdinandiana Fruit Extract is from the Kakadu plum. The Kakadu plum is native to northern Australia. The Kakadu plum holds the record for having the highest amount of natural vitamin C.

This ingredient is an antioxidant. Antioxidants help fight free-radical molecules. Free-radical molecules are capable of damaging our cells and other genetic material. Antioxidants help stabilize free-radicals and thus may reduce the signs of aging.

The high vitamin C content of Kakadu plum also helps lighten skin. Vitamin C has been shown to block the process of skin darkening that leads to hyperpigmentation.

Kakadu plums have been used by indigenous cultures as medicine to help treat colds and as an antiseptic.

Learn more about Terminalia Ferdinandiana Fruit Extract
Buffering, Masking

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
Cleansing, Emulsifying

Behenic Acid is a fatty acid and has moisturizing properties.

It is naturally occuring in the Moringa oleifera tree, rapeseed oil, and peanut oil.

This ingredient may not be Malassezia folliculitis, or fungal acne safe.

Learn more about Behenic Acid
Skin Conditioning

Ceramide NP is a type of ceramide.

Ceramides are intercellular lipids naturally found in our skin that bonds dead skin cells together to create a barrier. They are known for their ability to hold water and thus are a great ingredient for dry skin.

Ceramides are an important building block for our skin barrier. A stronger barrier helps the skin look more firm and hydrated. By bolstering the skin ceramides act as a barrier against irritating ingredients. This can help with inflammation as well.

If you would like to eat ceramides, sweet potatoes contain a small amount.

Read more about other common types of ceramides here: Ceramide AP Ceramide EOP

Learn more about Ceramide NP
Emollient, Emulsifying, Skin Conditioning

Cholesterol is a class of organic molecules called lipids. It helps hydrate your skin and is essential to having a healthy skin barrier.

Our skin naturally contains cholesterol in the outermost layer. Besides cholesterol, it also contains ceramides and fatty acids. Cholesterol makes up about 1/4 of your skin's outer layer and barrier. Your skin barrier is responsible for keeping allergens and microbes out. Having a healthy skin barrier is also responsible for keeping your skin firm and plump.

Our bodies use cholestrol to create vitamin D, steroid hormones, and more.

Learn more about Cholesterol
Skin Conditioning, Skin Protecting

This ingredient is a copper salt known for its wound healing properties.

Our bodies use copper to help stabilize our skin's collagen and elastin. Its also an essential for superoxide dismutase, an enzyme with strong antioxidant properties.

Copper has wound healing properties due to its role in creating new blood vessels and tissue repair.

Learn more about Copper Gluconate
Preservative

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

This ingredient comes from potassium salt derived from sorbic acid. Sorbic acid is a natural antibiotic and effective against fungus.

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

You'll often find this ingredient used with other preservatives.

Learn more about Potassium Sorbate
Skin Conditioning

Ceramide NS is a type of Ceramide. Ceramides are intercellular lipids naturally found in our skin that bonds dead skin cells together to create a barrier. They are known for their ability to hold water and thus are a great ingredient for dry skin.

Ceramide NG,Ceramide NS,1,3-Hexadecanediol, 2-Hexadecanamide,Palmitoyl-C16-Dihydrosphingosine,1-Stearoyl-C18-Sphingosine

Buffering, Skin Conditioning

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

Glycine already plays a role in helping keep our skin moisturized as amino acids transport moisture throughout our skin.

As collagen is made up of glycine and other amino acids, it is believed glycine may help our skin produce more collagen.

Learn more about Glycine
Masking, Preservative

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.

It 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
Masking, Skin Conditioning

Serine is an amino acid naturally found in our body. Our bodies use amino acids to create protein.

Amino-acids help give keep our skin hydrated. They play an important role in the skin barrier, which keeps the skin plump and firm.

Serine is a non-essential amino acid, meaning we don't need to obtain it from eating foods.

Learn more about Serine
Humectant

Glutamic Acid is an amino acid that is found in all living organisms. Our bodies use this to help nerve cells in the brain communicate with other cells.

In cosmetics, glutamic acid is a famous humectant. It draws water from the air to your skin, keeping your skin hydrated (like hyaluronic acid).

An in-vitro study from 2024 found glutamic acid to play a role in inhibiting inflammation and thus a potential skin-soothing ingredient.

Other studies show it to be have potential wound healing, skin barrier repair, and hair growth properties.

Glutamic acid has poor solubility in water and other solvents.

Learn more about Glutamic Acid
Skin Conditioning

Ceramide AP is a type of Ceramide.

Ceramides are intercellular lipids naturally found in our skin that bonds dead skin cells together to create a barrier. Having a strong skin barrier leads to more firm and hydrated skin.

They are known for their ability to hold water and thus are a great ingredient for dry skin. By bolstering the skin ceramides act as a barrier against irritating ingredients. This can help with inflammation as well.

If you would like to eat ceramides, sweet potatoes contain a small amount.

Read more about other common types of ceramides here: Ceramide NP Ceramide EOP

Learn more about Ceramide AP
Skin Conditioning

Ceramide EOP is a type of Ceramide.

EOP stands for a linked Ester fatty acid, a linked Omega hydroxy fatty acid, and the Phytosphingosine base.

Ceramides are intercellular lipids naturally found in our skin. They bind dead skin cells together to create a barrier. The ceramides in our skin have the ability to hold water to keep our skin hydrated.

Ceramides are an important building block for our skin barrier. A strong skin barrier helps with:

If you would like to eat ceramides, sweet potatoes contain a small amount.

Read more about other common types of ceramides here:

Learn more about Ceramide EOP
Skin Conditioning

Ceramide EOS is a type of Ceramide.

Ceramides are intercellular lipids naturally found in our skin that bonds dead skin cells together to create a barrier. They are known for their ability to hold water and thus are a great ingredient for dry skin.

Ceramide EOS is a synthetic N-acylated sphingolipid consisting of Sphingosine having the D-erythro structure linked to an esterified omega-hydroxy saturated or unsaturated fatty acid

Learn more about Ceramide Eos
Masking, Skin Conditioning

Aspartic Acid is an amino acid that our bodies produce naturally. It is an antioxidant.

Our body uses Aspartic Acid to help build collagen and elastin. It also plays a role in hydrating skin.

Skin Conditioning

We don't have a description for Leucine yet.

Skin Conditioning

This ceramide helps condition and moisturize skin.

It is created by reacting caproic acid and phytosphingosine, two fatty acids.

Ceramides work to improve hydration from within. Their lipophilic trait means they are likely to be absorbed into skin but expected to remain in the epidermis (the outer layer of skin).

Learn more about Caprooyl Phytosphingosine
Skin Conditioning

We don't have a description for Caprooyl Sphingosine yet.

Masking, Skin Conditioning

Alanine is an amino acid and is already found in the human body. Our skin uses alanine to build collagen, elastin, and keratin.

Skin Conditioning

Lysine is an essential amino acid. Your body is unable to produce it naturally and we mainly get lysine from food sources.

Our bodies use lysine for growth and tissue repair. The skin uses amino acids as a precursor for building protein, and therefore keratins, collagen and elastin.

Masking, Skin Conditioning

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

As a cosmetic ingredient, Arginine has antioxidant properties and can also help repair damaged skin. This ingredient is derived either synthetically or from animals.

Arginine isn't fungal acne safe when used in the presence of other lipids (fats, fatty acids, oils, esters, etc). Oils and fats occur naturally within the skin, so take caution when using Arginine if you're prone to fungal acne.

Learn more about Arginine
Masking, Skin Conditioning

Tyrosine is one of the amino acids used to create protein. It plays a role in melanin production.

A study from 2012 found tyrosine to show promising results in restoring skin volume.

Masking, Skin Conditioning

Phenylalanine is an amino acid. It is a skin soothing and hydrating ingredient. Amino acids play a crucial role in wound healing and skin hydration.

This ingredient is also used to help even out skin tone due to its ability to disrupt the melanin production process.

Two structures of phenylalanine exist: L-phenylalanine and D-phenylalanine. L-phenylalanine is essential, this means our bodies cannot produce it naturally and we must get it from foods. Our bodies convert D-phenylalanine to neurotransmitters, and D-phenylalanine is found in our bodies naturally.

Some foods that contain L-phenylalanine include eggs, soybeans, beef, milk.

Learn more about Phenylalanine
Skin Conditioning

Proline is an amino-acid. It helps moisturize the skin and plays an important role in creating proteins.

Our skin uses proline as one of the building blocks for producing collagen.

In medicine, proline is used as an osmoprotectant. This means it helps prevent oxidative degradation in other drugs.

Our bodies are able to produce proline naturally, but certain conditions may inhibit this production. In that case, proline can be obtained from eating egg whites, soy protein, dairy products, asparagus, mushrooms, and seaweed.

Learn more about Proline

Threonine is an amino-acid. It helps hydrate the skin and has antioxidant benefits.

Our skin uses threonine for creating collagen and elastin. Humans are not able to create threonine and must get it through eating foods such as fish, lentils, poultry, sesame seeds, and more.

Masking, Skin Conditioning

Valine is an essential amino acid. It is used by our bodies for tissue repair and muscle growth.

An essential amino acid is one in which our bodies cannot naturally produce so we must get them through diet. Foods such as eggs, dairy, red meat, and fish contain valine.

This ingredient can either be derived from an animal product or be synthetically created.

Learn more about Valine
Skin Conditioning

Isoleucine is an amino acid that helps reinforce our skin barrier. This amino acid plays a role in creating protein for the body.

Fun fact: Isoleucine is found in meat, fish, dairy, legumes, and nuts.

Humectant, Skin Conditioning

Histidine is a semi-essential amino acid used by our bodies to create protein. It has humectant and skin conditioning properties.

Our bodies use histidine to create filaggrin - filaggrin is a structural protein that the skin uses in maintaining skin barrier.

One study found histidine and carnosine to be a dynamic duo for your skin:

Oral histidine has also been found to help with filaggrin-deficit skin disorders such as atopic dermatitis.

Why is it considered a semi-essential amino acid? This is because adults are able to create it but children must get it from their diet.

Learn more about Histidine
Perfuming, Solvent

Limonene 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 Limonene
Cosmetic Colorant

Ci 77891 is a white pigment from Titanium dioxide. It is naturally found in minerals such as rutile and ilmenite.

It's main function is to add a white color to cosmetics. It can also be mixed with other colors to create different shades.

Ci 77891 is commonly found in sunscreens due to its ability to block UV rays.

Learn more about CI 77891
Cosmetic Colorant

Ci 77491 is also hydrated iron III oxide. It's sole purpose is to give a red/pink hue to products.

Iron III oxides are classified as inorganic chemicals for coloring.

Synthetically created Ci 77491 is considered safer than those naturally found. This is because the synthetically created version may contain less impurities. Iron oxides are generally non-toxic and non-allergenic.

Learn more about CI 77491

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Where it's from

Rationale is a Australian brand

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· Updated May 28, 2025 Added by katiepaull