The Ordinary Ascorbyl Tetraisopalmitate Solution 20% In Vitamin F Versus Dr. Dennis Gross Skincare C+ Collagen Brighten & Firm Vitamin C Serum
This brightening serum is formulated around Tetrahexyldecyl Ascorbate to brighten dull-looking skin and fade the look of dark spots.
This brightening serum is formulated around 3-O-Ethyl Ascorbic Acid and Niacinamide to brighten dull-looking skin and soften the look of wrinkles.
What's inside
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningGlycerin
Humectant
3-O-Ethyl Ascorbic Acid
Skin Conditioning
Niacinamide
Smoothing
Glycereth-7 Triacetate
EmollientLactic Acid
Buffering
Sd Alcohol 40-B
Astringent
Hydroxyethylcellulose
Emulsion StabilisingDimethyl Isosorbide
SolventAscorbic Acid
Antioxidant
Collagen Amino Acids
Moisturising
Superoxide Dismutase
Antioxidant
Glycine
Buffering
Carnitine Hcl
HumectantUbiquinone
Antioxidant
Hexylresorcinol
Antimicrobial
Emblica Officinalis Fruit Extract
Skin ConditioningHydrolyzed Soy Protein
Humectant
Tetrahexyldecyl Ascorbate
Antioxidant
Isoquercetin
Antioxidant
Mandelic Acid
Antimicrobial
Pueraria Lobata Root Extract
HumectantCurcuma Longa Root Extract
Antioxidant
Phytic Acid
Chelating
Citric Acid
Buffering
Tetrasodium EDTA
ChelatingSodium Citrate
BufferingButylene Glycol
Humectant
Xanthan Gum
EmulsifyingPolysorbate 20
Emulsifying
T-Butyl Alcohol
Perfuming
Sodium Hydroxide
BufferingPolysorbate 80
Emulsifying
Denatonium Benzoate
Masking
Benzyl Alcohol
Perfuming
Phenoxyethanol
Preservative
Sodium Benzoate
Masking
Potassium Sorbate
Preservative
Water, Glycerin, 3-O-Ethyl Ascorbic Acid, Niacinamide, Glycereth-7 Triacetate, Lactic Acid, Sd Alcohol 40-B, Hydroxyethylcellulose, Dimethyl Isosorbide, Ascorbic Acid, Collagen Amino Acids, Superoxide Dismutase, Glycine, Carnitine Hcl, Ubiquinone, Hexylresorcinol, Emblica Officinalis Fruit Extract, Hydrolyzed Soy Protein, Tetrahexyldecyl Ascorbate, Isoquercetin, Mandelic Acid, Pueraria Lobata Root Extract, Curcuma Longa Root Extract, Phytic Acid, Citric Acid, Tetrasodium EDTA, Sodium Citrate, Butylene Glycol, Xanthan Gum, Polysorbate 20, T-Butyl Alcohol, Sodium Hydroxide, Polysorbate 80, Denatonium Benzoate, Benzyl Alcohol, Phenoxyethanol, Sodium Benzoate, Potassium Sorbate
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
