Obagi Professional-C Serum 20% Versus Alastin C-Radical Defense Antioxidant Serum
Updated on May 23, 2025
Overview
What they are
These products are both reef safe serums. They have a total of 2 ingredients in common
Cool Features
They both contain Vitamin C
Suited For
They're both likely to be good for anti aging, dry skin, brightening skin, reducing pores, scar healing, dark spots and better texture
Free From
They both do not contain any common allergens, parabens, silicones or sulfates
What's Inside
They both contain fragrances
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
Obagi Professional-C Serum 20% 12 ingredients
Alastin C-Radical Defense Antioxidant Serum 39 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
Obagi Professional-C Serum 20% 12 ingredients
Alastin C-Radical Defense Antioxidant Serum 39 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Ingredients Side-by-side
Water
Skin ConditioningCaprylic/Capric Triglyceride
Masking
Glycerin
Humectant
Sodium Acrylates Copolymer
Squalane
Emollient
Sodium Ascorbate
Antioxidant
Ubiquinone
Antioxidant
Ectoin
Skin Conditioning
Physalis Angulata Extract
Skin ProtectingBetaine
Humectant
Phosphatidylcholine
EmulsifyingCamellia Sinensis Leaf Extract
Antimicrobial
Carnosine
Skin Conditioning
Centella Asiatica Extract
Cleansing
Olea Europaea Leaf Extract
Perfuming
Zingiber Officinale Root Extract
Masking
Ergothioneine
Antioxidant
Dunaliella Salina Extract
Skin ConditioningPunica Granatum Fruit Extract
Antioxidant
Bisabolol
Masking
Lactoferrin
Skin ConditioningTremella Fuciformis Sporocarp Extract
Antioxidant
Polyglyceryl-10 Laurate
Skin Conditioning
Cetyl Alcohol
Emollient
Sodium Benzoate
Masking
Xanthan Gum
EmulsifyingTocopherol
Antioxidant
Helianthus Annuus Seed Oil
Emollient
Propanediol
Solvent
Tocopheryl Acetate
Antioxidant
Caprylyl Glycol
EmollientMannitol
Humectant
Lecithin
Emollient
Phenoxyethanol
Preservative
C12-15 Alkyl Benzoate
AntimicrobialEthylhexylglycerin
Skin ConditioningCaprylhydroxamic Acid
Citric Acid
Buffering
Potassium Sorbate
Preservative
Water, Caprylic/Capric Triglyceride, Glycerin, Sodium Acrylates Copolymer, Squalane, Sodium Ascorbate, Ubiquinone, Ectoin, Physalis Angulata Extract, Betaine, Phosphatidylcholine, Camellia Sinensis Leaf Extract, Carnosine, Centella Asiatica Extract, Olea Europaea Leaf Extract, Zingiber Officinale Root Extract, Ergothioneine, Dunaliella Salina Extract, Punica Granatum Fruit Extract, Bisabolol, Lactoferrin, Tremella Fuciformis Sporocarp Extract, Polyglyceryl-10 Laurate, Cetyl Alcohol, Sodium Benzoate, Xanthan Gum, Tocopherol, Helianthus Annuus Seed Oil, Propanediol, Tocopheryl Acetate, Caprylyl Glycol, Mannitol, Lecithin, Phenoxyethanol, C12-15 Alkyl Benzoate, Ethylhexylglycerin, Caprylhydroxamic Acid, Citric Acid, Potassium Sorbate
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. If you see this, drink a glass of water. Stay hydrated!
Learn more about WaterPhenoxyethanol 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.
Ingredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Obagi Professional-C Serum 20% 12 ingredients
Alastin C-Radical Defense Antioxidant Serum 39 ingredients
Reviews
Here's what our community thinks
Obagi Professional-C Serum 20% 12 ingredients
Alastin C-Radical Defense Antioxidant Serum 39 ingredients
I have tried so many vitamin c serums and they all unfortunately broke me out and often stung my overly sensitive skin. I tried everyone's HG, the SkinCeuticals C E Ferulic which was by far the worst. I don't like a lot of Alastin products but this is the only vitamin c I've ever tried that works for me.
