Prequel Lucent-C Brightening Vitamin C Serum Versus Alastin C-Radical Defense Antioxidant Serum
Updated on May 23, 2025
Overview
What they are
These products are both cruelty-free and reef safe serums. They have a total of 5 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, sensitive skin, reducing pores, scar healing, dark spots and better texture
Free From
They both do not contain any harsh alcohols, common allergens, parabens, silicones or sulfates
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
Prequel Lucent-C Brightening Vitamin C Serum 14 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
Prequel Lucent-C Brightening Vitamin C Serum 14 ingredients
Alastin C-Radical Defense Antioxidant Serum 39 ingredients
Key Ingredients
Benefits
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 WaterPropanediol 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 PropanediolErgothioneine is an amino acid found naturally in mushrooms, grains, and meat. It has antioxidant and skin soothing properties.
This amino acid helps with:
- Maintaining DNA stability and cell reproduction
- Enhances cellular immunity
- Skin brightening
- Anti-aging
- Skin soothing
Caprylyl Glycol is a humectant and emollient, meaning it attracts and preserves moisture.
It is a common ingredient in many products, especially those designed to hydrate skin. The primary benefits are retaining moisture, skin softening, and promoting a healthy skin barrier.
Though Caprylyl Glycol is an alcohol derived from fatty acids, it is not the kind that can dry out skin.
This ingredient is also used as a preservative to extend the life of products. It has slight antimicrobial properties.
Learn more about Caprylyl GlycolMannitol is a sugar alcohol. It is a humectant and moisturizes the skin. In vitro (not tested on a living organism), mannitol displays antioxidant properties.
When found in aqueous solutions, mannitol tends to become acidic. This is because it loses a hydrogen ion. This is why mannitol can often be found with pH adjusting ingredients, such as sodium bicarbonate.
Fun fact: Mannitol can be found in foods as a sweetener. It can be naturally found in mushrooms, algae, fruits, and veggies.
Learn more about MannitolIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Prequel Lucent-C Brightening Vitamin C Serum 14 ingredients
Alastin C-Radical Defense Antioxidant Serum 39 ingredients
Reviews
Here's what our community thinks
Prequel Lucent-C Brightening Vitamin C Serum 14 ingredients
When I first got into skincare years ago, I tried the extremely expensive ce ferulic everyone knows and, though I loved it and it made a big difference in my skin, I couldn’t justify the price for what ended up being half a bottle before it oxidized. All other vitamin c just irritated my skin so I gave up on it. I had a reoccurrence of my acne recently and remembered that this product had been a Show more
I really like this Vitamin C serum and have noticed an improvement in some of my dark spots. The serum is packaged in opaque glass to protect it from UV. I don't like the pump very much as the formula is very liquid and it shoots out fast - something to be aware of. It also has to go on first (before other serums) as things can pill on top of it. However, for the price and effectiveness, I'm Show more
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.
