Jack Black Brightening Booster Vitamin C Serum Versus Medik8 C-Tetra Lipid Vitamin C Serum
Updated on February 01, 2024
Overview
What they are
These products are both cruelty-free and reef safe serums. They have a total of 1 ingredients in common
Cool Features
They both contain Vitamin C and Vitamin E
Suited For
They're both likely to be good for dry skin, brightening skin, reducing pores, scar healing and better texture
Free From
They both do not contain any harsh alcohols, parabens or sulfates
What's Inside
They both contain fragrances, oils and 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
Jack Black Brightening Booster Vitamin C Serum 37 ingredients
Medik8 C-Tetra Lipid Vitamin C Serum 11 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
Jack Black Brightening Booster Vitamin C Serum 37 ingredients
Medik8 C-Tetra Lipid Vitamin C Serum 11 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningTetrahexyldecyl Ascorbate
Antioxidant
Propanediol
Solvent
Glycerin
Humectant
Caprylic/Capric Triglyceride
Masking
Dimethicone
Emollient
Helianthus Annuus Seed Oil
Emollient
Arachidyl Alcohol
EmollientTerminalia Chebula Fruit Extract
Skin ConditioningCetearyl Alcohol
Emollient
Bis-PEG-18 Methyl Ether Dimethyl Silane
EmollientPhenoxyethanol
Preservative
Behenyl Alcohol
Emollient
Acetyl Zingerone
Antioxidant
Arachidyl Glucoside
EmulsifyingAcrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingCaprylyl Glycol
EmollientDipropylene Glycol
MaskingPEG-6 Methyl Ether
SolventHydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion StabilisingSodium Hydroxide
BufferingTocopherol
Antioxidant
Scenedesmus Rubescens Extract
Skin ConditioningDimethiconol
Emollient
Panthenol
Skin Conditioning
Ethylhexylglycerin
Skin ConditioningHydrogenated Lecithin
Emulsifying
Sorbitan Olivate
Emulsifying
Cetearyl Olivate
Disodium EDTA
Camellia Sinensis Leaf Extract
Antimicrobial
Olea Europaea Fruit Oil
Masking
Linum Usitatissimum Seed Extract
Perfuming
Laminaria Digitata Extract
Skin Protecting
Punica Granatum Fruit Extract
Antioxidant
Polysorbate 60
Emulsifying
Sorbitan Isostearate
Emulsifying
Water, Tetrahexyldecyl Ascorbate, Propanediol, Glycerin, Caprylic/Capric Triglyceride, Dimethicone, Helianthus Annuus Seed Oil, Arachidyl Alcohol, Terminalia Chebula Fruit Extract, Cetearyl Alcohol, Bis-PEG-18 Methyl Ether Dimethyl Silane, Phenoxyethanol, Behenyl Alcohol, Acetyl Zingerone, Arachidyl Glucoside, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Caprylyl Glycol, Dipropylene Glycol, PEG-6 Methyl Ether, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Sodium Hydroxide, Tocopherol, Scenedesmus Rubescens Extract, Dimethiconol, Panthenol, Ethylhexylglycerin, Hydrogenated Lecithin, Sorbitan Olivate, Cetearyl Olivate, Disodium EDTA, Camellia Sinensis Leaf Extract, Olea Europaea Fruit Oil, Linum Usitatissimum Seed Extract, Laminaria Digitata Extract, Punica Granatum Fruit Extract, Polysorbate 60, Sorbitan Isostearate
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Tetrahexyldecyl Ascorbate (THD) is a stable and oil-soluble form of Vitamin C.
THD is special in that it has the ability to travel deeper into skin than traditional ascorbic acid while maintaining the same skin benefits (double win!).
Because it’s oil-soluble, THD dives deep into your skin’s fatty layers (think ceramides and cholesterol) to fight off the kind of free radicals that mess with your skin barrier. This makes it a great pair with water-based vitamin C (ascorbic acid) that mainly works on the surface.
Even at just 0.1%, THD is already showing great antioxidant activity. When used up to 2%, it helps keep your skin happy and calm, especially when it’s stressed from pollution or sun.
Want to fade dark spots or tackle hyperpigmentation? You’ll want 5% or more. Pairing it with brightening buddies like niacinamide or licorice root gives even better results. One study even used 30% THD with other brighteners and saw real results on stubborn discoloration, even in melasma-prone skin.
A note on THD: It’s has a slightly silky, oily texture and usually shows up colorless or pale yellow (though the exact shade can vary by supplier).
While you can sneak it into water-based formulas, it really shines when paired with silicones or oils, which help your skin soak it up better.
THD is pretty stable, but it’s still vulnerable to degradation like ascorbic acid. Too much light or heat (above 113°F / 45°C) can break it down over time. Go for dark and opaque packaging that keeps it safe and shady!
Read more about other types of Vitamin C:
Learn more about Tetrahexyldecyl AscorbateIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Jack Black Brightening Booster Vitamin C Serum 37 ingredients
Medik8 C-Tetra Lipid Vitamin C Serum 11 ingredients
Reviews
Here's what our community thinks
