Updated on June 05, 2025
Overview
What they are
These products are both cruelty-free and reef safe serums. They have a total of 3 ingredients in common
Cool Features
They both contain hyaluronic acid, Vitamin C and Vitamin E
Suited For
They're both likely to be good for 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 parabens or sulfates
What's Inside
They both contain silicones
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
Olehenriksen Truth Serum 37 ingredients
COSRX The Vitamin C 23 Serum 34 ingredients
What's inside (and what isn't)
What's inside (and what isn't)
At a glance
Click on any of the items below to learn more
Olehenriksen Truth Serum 37 ingredients
COSRX The Vitamin C 23 Serum 34 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningGlycerin
Humectant
Oleth-20
CleansingSodium Ascorbyl Phosphate
Antioxidant
Hydroxyethylcellulose
Emulsion StabilisingPhenoxyethanol
Preservative
Caprylyl Glycol
EmollientHexylene Glycol
EmulsifyingCitric Acid
Buffering
Parfum
Masking
PEG-12 Dimethicone
Skin Conditioning
Tocopheryl Acetate
Antioxidant
Aroma
Hydrolyzed Vegetable Protein
Skin ConditioningDisodium Phosphate
BufferingPolysorbate 60
Emulsifying
Aloe Barbadensis Leaf Extract
Emollient
Citrus Aurantium Dulcis Fruit Extract
MaskingSodium Hyaluronate
Humectant
Thioctic Acid
Antioxidant
Calcium Ascorbate
Antioxidant
Sodium Phosphate
BufferingSorbitol
Humectant
Citrus Grandis Seed Extract
Astringent
Sodium Benzoate
Masking
Ascorbic Acid
Antioxidant
Camellia Sinensis Leaf Extract
Antimicrobial
Euphrasia Officinalis Extract
AntimicrobialRosa Canina Fruit Extract
Astringent
Leuconostoc/Radish Root Ferment Filtrate
Antimicrobial
Potassium Sorbate
Preservative
Triacetin
AntimicrobialSodium Benzotriazolyl Butylphenol Sulfonate
UV AbsorberBenzyl Benzoate
Antimicrobial
Limonene
Perfuming
Linalool
Perfuming
CI 15985
Cosmetic ColorantWater, Glycerin, Oleth-20, Sodium Ascorbyl Phosphate, Hydroxyethylcellulose, Phenoxyethanol, Caprylyl Glycol, Hexylene Glycol, Citric Acid, Parfum, PEG-12 Dimethicone, Tocopheryl Acetate, Aroma, Hydrolyzed Vegetable Protein, Disodium Phosphate, Polysorbate 60, Aloe Barbadensis Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, Sodium Hyaluronate, Thioctic Acid, Calcium Ascorbate, Sodium Phosphate, Sorbitol, Citrus Grandis Seed Extract, Sodium Benzoate, Ascorbic Acid, Camellia Sinensis Leaf Extract, Euphrasia Officinalis Extract, Rosa Canina Fruit Extract, Leuconostoc/Radish Root Ferment Filtrate, Potassium Sorbate, Triacetin, Sodium Benzotriazolyl Butylphenol Sulfonate, Benzyl Benzoate, Limonene, Linalool, CI 15985
Water
Skin ConditioningAscorbic Acid 23%
Antioxidant
Propanediol
Solvent
Dimethicone
Emollient
Tromethamine
BufferingPanthenol
Skin Conditioning
Ethyl Ether
SolventSqualane
Emollient
Caffeine
Skin Conditioning
Sodium 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 Conditioning
Beta-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.
Ascorbic Acid is is pure Vitamin C. This form makes up the largest amount of vitamin C found naturally in our skin.
Not only is vitamin C great for your overall health and immune system, it also has plenty of benefits on your skin.
Vitamin C is best used for brightening skin. It improves dark spots, acne scars, and hyperpigmentation. This is because it blocks the process of skin darkening when exposed to UV.
Remember: Vitamin C should not replace sunscreen!
Your skin uses vitamin C to build collagen. Collagen is one key component in having a strong skin barrier and plump skin. Vitamin C also plays a role in regulating collagen, thus making it effective in improving wrinkles and fine lines.
Ascorbic acid shows potent antioxidant activity. As an antioxidant, it helps fight free-radicals. Free-radicals are molecules that may damage your skin cells. These antioxidants also protect skin against UV damage.
The best formulations include Vitamin E and/or ferulic acid. These two ingredients help stabilize and provide a boost in the benefits of ascorbic acid. This is because ascorbic acid becomes unstable when exposed to UV and air. In fact, you can tell your ascorbic acid has oxidized when it turns an orange-yellow color.
Ascorbic acid is generally compatible with other ingredients. However, using ascorbic acid with other active ingredients might cause irritation. Two ingredients: copper ions and benzoyl peroxide, will inactivate ascorbic acid completely.
Read more about other types of Vitamin C:
Foods rich with vitamin C include oranges, strawberries, broccoli, bell peppers, and more. When consuming Vitamin C, your skin receives a portion of the nutrients.
Learn more about Ascorbic AcidSodium Hyaluronate is hyaluronic acid's salt form. It is commonly derived from the sodium salt of hyaluronic acid.
Like hyaluronic acid, it is great at holding water and acts as a humectant. This makes it a great skin hydrating ingredient.
Sodium Hyaluronate is naturally occurring in our bodies and is mostly found in eye fluid and joints.
These are some other common types of Hyaluronic Acid:
Learn more about Sodium HyaluronateWater. 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 WaterIngredient Ratings
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When to use
Olehenriksen Truth Serum 37 ingredients
COSRX The Vitamin C 23 Serum 34 ingredients
Reviews
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