Overview
What it is
Hair serum with 16 ingredients
Cool Features
It is vegan, cruelty-free, and reef safe
Suited For
It has ingredients that are good for dry skin, sensitive skin and scar healing
Free From
It doesn't contain any harsh alcohols, parabens, silicones or sulfates
Fun facts
Rëzo Haircare is from United States.
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
Ingredients List
Ricinus Communis Seed Oil
MaskingParfum
MaskingGlycerin
HumectantBenzyl Benzoate
AntimicrobialAlanine
MaskingLinum Usitatissimum Seed Oil
PerfumingProline
Skin ConditioningIsostearic Acid
CleansingGlycine
BufferingLysine
Skin ConditioningGlutamic Acid
HumectantAspartic Acid
MaskingSimmondsia Chinensis Seed Oil
EmollientPolygonum Multiflorum Root Extract
Skin ConditioningAngelica Polymorpha Sinensis Root Extract
Skin ConditioningRosa Rugosa Flower Extract
Skin ConditioningRicinus Communis Seed Oil, Parfum, Glycerin, Benzyl Benzoate, Alanine, Linum Usitatissimum Seed Oil, Proline, Isostearic Acid, Glycine, Lysine, Glutamic Acid, Aspartic Acid, Simmondsia Chinensis Seed Oil, Polygonum Multiflorum Root Extract, Angelica Polymorpha Sinensis Root Extract, Rosa Rugosa Flower Extract
Benefits
Concerns
Ingredients Explained
Ricinus Communis Seed Oil is the INCI name for castor oil.
Castor Oil helps moisturize the skin. It is rich in a fatty acid called ricinoleic acid. This fatty acid helps prevent moisture loss on the skin. This helps keep your skin soft and hydrated. Ricinoleic acid also has anti-inflammatory and pain reducing properties.
Besides hydrating the skin, castor oil is also used to hydrate hair. By keeping the hair shaft moisturized, breakage is decreased. More studies are needed to show castor oil's effective on stimulating hair growth.
Castor oil is created by cold-pressing castor seeds and then purifying the oil with heat. It was used in Ancient Egypt as fuel in lamps and to help treat eye irritation.
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 Ricinus Communis Seed OilParfum is a catch-all term for an ingredient or more that is used to give a scent to products.
Also called "fragrance", this ingredient 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.
For instance, Habanolide is a proprietary trade name for a specific aroma chemical. When used as a fragrance ingredient in cosmetics, most aroma chemicals fall under the broad labeling category of “FRAGRANCE” or “PARFUM” according to EU and US regulations.
The term 'parfum' or '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 by INCI standards.
One example is Calendula flower extract. Calendula is an essential oil that still imparts a scent or 'fragrance'.
Depending on the blend, the ingredients in the mixture can cause allergies and sensitivities on the skin. Some ingredients that are known EU allergens include linalool and citronellol.
Parfum can also be used to mask or cover an unpleasant scent.
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 ParfumGlycerin (or glycerol) is a compound naturally found in your skin. It's a powerhouse humectant that pulls water into the stratum corneum.
Topically, glycerin does several things at once:
Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.
Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.
This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.
Just know very high concentrations (>40%) can feel tacky in low humidity.
Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.
Learn more about GlycerinBenzyl Benzoate is usually created from the condensation of benzoic acid and benzyl alcohol. It is used as a preservative, solvent, and has a floral/balsamic scent in large amounts.
As a preservative, Benzyl Benzoate works against bacteria and fungus. It is often used to treat scabies and lice in medicine.
Solvents are used to keep ingredients together in a product. They can help dissolve ingredients to stable bases or help evenly distribute ingredients throughout the product.
Due to its fragrance, Benzyl Benzoate can be sensitizing and may cause contact dermatitis. It is a known EU allergen. We recommend speaking with a professional if you have any concerns.
Benzyl Benzoate can be naturally found in cranberries and peaches.
Learn more about Benzyl BenzoateAlanine is an amino acid and is already found in the human body. Our skin uses alanine to build collagen, elastin, and keratin.
This ingredient is also known as flaxseed oil or linseed oil. It is created by cold-pressing the seeds of the flax plant and is rich in fatty acids.
This oil is packed with omega-3 (ALA), omega-6, and omega-9 fatty acids that closely mimic the skin's own natural lipid barrier. The high omega-3 content gives it solid anti-inflammatory properties.
Clinical studies have found it can reduce water loss and improve smoothness/hydration, particularly in sensitive skin types. Studies also suggest it helps maintain the lipid layer that is compromised in atopic (eczema-prone) skin.
Wound healing studies showed that low-concentration linseed oil formulations (1-5%) produced significant barrier repair, but it should be noted that high concentrations showed diminishing returns.
Due to the rich fatty acid content, this ingredient may not be fungal acne safe.
Learn more about Linum Usitatissimum Seed OilProline is a non-essential amino acid, meaning your body can make it on its own. In skincare, it is a skin conditioning ingredient that keeps skin soft and hydrated.
It makes up about 23% of the collagen molecule (collagen is the protein responsible for keeping your skin firm) and is involved in your skin's natural hyaluronic acid production. When applied topically, proline can penetrate the skin fairly well due to its small molecular size.
Reviews of this ingredient have found it to be neither a dermal irritant nor a sensitizer.
Fun fact: Proline can be found in protein-rich foods like meat, fish, eggs, and dairy.
Learn more about ProlineIsostearic acid is a saturated fatty acid. Its structure makes it a great surfactant.
Surfactants help decrease the surface tension between two liquids. This property also makes it an effective emulsifier. Emulsifiers help prevent waters and oils from separating in a product.
Isostearic Acid is created from oleic acid.
This ingredient may not be Malassezia folliculitis, or fungal-acne safe.
Learn more about Isostearic AcidGlycine is the smallest amino acid and a key building block of collagen. It's part if your skin's Natural Moisturizing Factor (NMF), or the water-loving molecules in your outermost layer of skin (stratum corneum) that keeps everything hydrated and happy.
A study from 2022 found that an amino acid complex featuring taurine, arginine, and glycine significantly reduced skin irritation, improved redness, and accelerated the skin repair process.
Lysine is an essential amino acid (your body cannot make it on its own). It has skin conditioning properties and one of the key players in collagen synthesis.
When your body creates collagen, lysine is basically the glue that holds everything together. It helps collagen fibers lock into each other and stay strong, with vitamin C being its trusty sidekick. Without enough lysine, this glue gets flimsy and less firm, resulting in less bouncy skin.
In skincare, lysine is mostly there to help keep your skin moisturized. It carries water through your skin's layers so everything stays plump.
So will putting lysine on your face create bouncier skin?
It's hard to say; most of the exciting collagen research on lysine comes from oral supplements or lab studies on mice. Further research is needed to truly understand what role topical lysine plays in skincare and your skin.
However, there's no harm in adding lysine to your routine as a supportive and hydrating ingredient.
Learn more about LysineGlutamic 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 AcidAspartic 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.
Jojoba oil is one of the most well-studied plant-derived ingredients in cosmetics. It is an emollient with a special structure.
Because it is made up of 97-98% wax esters, it closely mirrors the linear monoesters found in human sebum. This makes it skin compatible, non-greasy, and lightweight.
Unlike other plant oils, jojoba wax doesn't easily penetrate skin. It mostly works in the uppermost layers as an emollient. This just means it forms a light barrier on the skin to help retain moisture.
Formulations with jojoba esters up to 90% reduced transepidermal water loss (TEWL) and increased barrier recovery by 81% (outperforming bisabolol at 47%).
Besides barrier support, the science also suggests jojoba to have anti-inflammatory effects and potential applications for skin infections, aging, and wound healing.
Fun fact: Indigenous cultures have used jojoba as a moisturizer and to help treat burns for centuries.
Due to its fatty acid content, Jojoba oil may not be fungal acne safe.
Learn more about Simmondsia Chinensis Seed OilThis plant derived ingredient has skin conditioning and antioxidant properties.
You may see his ingredient in hair and scalp products because some research suggests it may support hair growth. However, strong human clinical evidence is limited.
We don't have a description for Angelica Polymorpha Sinensis Root Extract yet.
We don't have a description for Rosa Rugosa Flower Extract yet.
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Where it's from
Rëzo Haircare is a American brand
We're dedicated to providing you with the most up-to-date and science-backed ingredient info out there.
The data we've presented on this page has been verified by a member of the SkinSort Team.
Read more about us· Updated December 10, 2024 • Added by furosy