Naturium Quadruple Hyaluronic Acid Serum 5% Versus The Ordinary Ascorbyl Tetraisopalmitate Solution 20% In Vitamin F
This hydrating serum is formulated around Hydrolyzed Hyaluronic Acid and Sodium Hyaluronate to hydrate skin and strengthen the skin barrier.
This brightening serum is formulated around Tetrahexyldecyl Ascorbate to brighten dull-looking skin and fade the look of dark spots.
What's inside
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningGlycerin
Humectant
Propanediol
Solvent
Hydrolyzed Hyaluronic Acid
Humectant
Sodium Hyaluronate
Humectant
Apricot Kernel Oil Polyglyceryl-6 Esters
Emollient
Polyglyceryl-6 Oleate
Emulsifying
Caprylyl Glycol
Emollient
Polyglyceryl-10 Oleate
Skin Conditioning
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingMagnolol
Antioxidant
Kaempferol
Antioxidant
Tetrahexyldecyl Ascorbate
Antioxidant
Glycolipids
Skin ConditioningGlycine Soja Sterols
Emollient
Tocopheryl Acetate
Antioxidant
Phenoxyethanol
Preservative
Sorbitan Palmate
Emollient
Potassium Sorbate
Preservative
Sodium Hydroxide
BufferingGlyceryl Polyacrylate
Xanthan Gum
EmulsifyingHexylene Glycol
EmulsifyingWater, Glycerin, Propanediol, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate, Apricot Kernel Oil Polyglyceryl-6 Esters, Polyglyceryl-6 Oleate, Caprylyl Glycol, Polyglyceryl-10 Oleate, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Magnolol, Kaempferol, Tetrahexyldecyl Ascorbate, Glycolipids, Glycine Soja Sterols, Tocopheryl Acetate, Phenoxyethanol, Sorbitan Palmate, Potassium Sorbate, Sodium Hydroxide, Glyceryl Polyacrylate, Xanthan Gum, Hexylene Glycol
Reviews
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 Ascorbate
