Hyeja Vitamin C Brightening Serum Versus COSRX The Vitamin C 23 Serum
Updated on June 28, 2024
Overview
What they are
These products are both cruelty-free and reef safe serums. They have a total of 6 ingredients in common
Cool Features
They both contain niacinamide, Vitamin C and Vitamin E
Suited For
They're both likely to be good for fighting acne, anti aging, dry skin, brightening skin, sensitive skin, oily skin, reducing pores, scar healing, dark spots and better texture
Free From
They both do not contain any common allergens, parabens or sulfates
What's Inside
They both contain oils
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
Hyeja Vitamin C Brightening Serum 33 ingredients
COSRX The Vitamin C 23 Serum 34 ingredients
About this product
About this product
At a glance
Click on any of the items below to learn more
Hyeja Vitamin C Brightening Serum 33 ingredients
COSRX The Vitamin C 23 Serum 34 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Citrus Junos Fruit Extract
Skin ConditioningCamellia Sinensis Leaf Water
Masking
Butylene Glycol
Humectant
Water
Skin ConditioningDipropylene Glycol
MaskingNiacinamide
Smoothing
1,2-Hexanediol
Skin Conditioning3-O-Ethyl Ascorbic Acid
Skin Conditioning
Citrus Junos Peel Oil
Astringent
Panax Ginseng Root Water
Masking
Polyglyceryl-10 Myristate
Skin Conditioning
Centella Asiatica Extract
Cleansing
Saccharum Officinarum Extract
MoisturisingTocopherol
Antioxidant
Houttuynia Cordata Extract
Skin Conditioning
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion StabilisingCeramide NP
Skin Conditioning
Camellia Sinensis Leaf Extract
Antimicrobial
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingTromethamine
BufferingSodium Polyacrylate
AbsorbentAdenosine
Skin Conditioning
Sodium Phytate
Sorbitan Isostearate
Emulsifying
Glycerin
Humectant
Chamomilla Recutita Flower Extract
Masking
Portulaca Oleracea Extract
Skin ConditioningBetula Alba Juice
AstringentSimmondsia Chinensis Seed Oil
Emollient
Maltodextrin
AbsorbentSaccharide Hydrolysate
HumectantEthylhexylglycerin
Skin ConditioningLimonene
Perfuming
Citrus Junos Fruit Extract, Camellia Sinensis Leaf Water, Butylene Glycol, Water, Dipropylene Glycol, Niacinamide, 1,2-Hexanediol, 3-O-Ethyl Ascorbic Acid, Citrus Junos Peel Oil, Panax Ginseng Root Water, Polyglyceryl-10 Myristate, Centella Asiatica Extract, Saccharum Officinarum Extract, Tocopherol, Houttuynia Cordata Extract, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Ceramide NP, Camellia Sinensis Leaf Extract, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Tromethamine, Sodium Polyacrylate, Adenosine, Sodium Phytate, Sorbitan Isostearate, Glycerin, Chamomilla Recutita Flower Extract, Portulaca Oleracea Extract, Betula Alba Juice, Simmondsia Chinensis Seed Oil, Maltodextrin, Saccharide Hydrolysate, Ethylhexylglycerin, Limonene
Water
Skin ConditioningAscorbic Acid 23%
Antioxidant
Propanediol
SolventDimethicone
Emollient
Tromethamine
BufferingPanthenol
Skin Conditioning
Ethyl Ether
SolventSqualane
Emollient
Caffeine
Skin ConditioningSodium Chloride
Masking
Sodium Hyaluronate
Humectant
Sodium Sulfite
Preservative
Disodium EDTA
Glutathione
Adenosine
Skin Conditioning
Acetyl Glucosamine
Skin ConditioningGardenia Florida Fruit Extract
Skin ConditioningAllantoin
Skin Conditioning
Dextrin
AbsorbentTocotrienols
Skin ConditioningTocopherol
Antioxidant
Elaeis Guineensis Oil
Emollient
Butylene Glycol
Humectant
Arginine
Masking
Niacinamide
Smoothing
Pentylene Glycol
Skin ConditioningAlcohol Denat.
Antimicrobial
Helianthus Annuus Seed Oil
Emollient
Glycyrrhiza Glabra Root Extract
Bleaching
Methyl Trimethicone
Skin Conditioning
Carthamus Tinctorius Seed Oil
Masking
Camellia Japonica Seed Oil
Emollient
Daucus Carota Sativa Root Extract
Skin ConditioningBeta-Carotene
Skin ConditioningWater, Ascorbic Acid 23%, Propanediol, Dimethicone, Tromethamine, Panthenol, Ethyl Ether, Squalane, Caffeine, Sodium Chloride, Sodium Hyaluronate, Sodium Sulfite, Disodium EDTA, Glutathione, Adenosine, Acetyl Glucosamine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Tocotrienols, Tocopherol, Elaeis Guineensis Oil, Butylene Glycol, Arginine, Niacinamide, Pentylene Glycol, Alcohol Denat., Helianthus Annuus Seed Oil, Glycyrrhiza Glabra Root Extract, Methyl Trimethicone, Carthamus Tinctorius Seed Oil, Camellia Japonica Seed Oil, Daucus Carota Sativa Root Extract, Beta-Carotene
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
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.
- It has mild preservative properties.
Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.
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 WaterNiacinamide has emerged as an all-star ingredient due to its many benefits.
It is known to treat acne by reducing inflammation. It also helps fade dark-spots and strengthen the skin by promoting the growth of the ceramide barrier.
Other benefits include smoothing wrinkles and minimizing redness.
The cherry on top? Niacinamide can also help build keratin, a protein that keeps skin firm.
When incorporating niacinamide into your routine, look out for concentration amounts. Typically, 5% niacinamide provides benefits such as fading dark spots. However, if you have sensitive skin, it is better to begin with a smaller concentration.
Niacinamide can be mixed with other ingredients to boost benefits. For instance, it has shown to be effective when used with copper, folic acid, and zinc to treat acne.
Learn more about NiacinamideTocopherol (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 TocopherolTromethamine helps balance the pH and improve the texture of a product. It is synthetically created.
As an emulsifier, Tromethamine prevents oil and water ingredients from separating. This helps stabilize the product and elongate a product's shelf life. Tromethamine also makes a product thicker.
Tromethamine helps balance the pH level of a product. Normal pH level of skin is slightly acidic (~4.75-5.5). The acidity of our skin is maintained by our glands and skin biome. Being slightly acidic allows our skin to create an "acid mantle". This acid mantle is a thin barrier that protects our skin from bacteria and contaminants.
Oral Tromethanmine is an anti-inflammatory drug but plays the role of masking, adding fragrance, and/or balancing pH in skincare.
1,3-Propanediol, 2-amino-2-(hydroxymethyl)-
Learn more about TromethamineAdenosine is in every living organism. It is one of four components in nucleic acids that helps store our DNA.
Adenosine has many benefits when used. These benefits include hydrating the skin, smoothing skin, and reducing wrinkles. Once applied, adenosine increases collagen production. It also helps with improving firmness and tissue repair.
Studies have found adenosine may also help with wound healing.
In skincare products, Adenosine is usually derived from yeast.
Learn more about AdenosineIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Hyeja Vitamin C Brightening Serum 33 ingredients
COSRX The Vitamin C 23 Serum 34 ingredients
Reviews
Here's what our community thinks
COSRX The Vitamin C 23 Serum 34 ingredients
I didn't like the consistency of this serum at all.
It felt like I was putting oil to my face, but since I always use the whole product to see results this did nothing to me other than feeling uncomfortable.
Cured my acne scars
I had mix feelings when I first bought this as I read that the smell can be off-putting. But I am glad I bought it. My acne scars faded a lot more after 3 days of using it and saw great results in one week. It also didn't break me out despite containing alcohols and oils. It does sting a little on the first application but doesn't irritate my skin. The smell can be quite strong Show more
