Estée Lauder Perfectionist Pro Serum Rapid Brightening Treatment with Ferment² + Vitamin C Versus Dr. Dennis Gross Skincare C+ Collagen Brighten & Firm Vitamin C Serum

Estée Lauder Perfectionist Pro Serum Rapid Brightening Treatment with Ferment² + Vitamin C Versus Dr. Dennis Gross Skincare C+ Collagen Brighten & Firm Vitamin C Serum

This brightening serum is formulated around Ascorbyl Glucoside and Acetyl Glucosamine 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

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Butylene Glycol

Glycerin

Glycereth-26

Isononyl Isononanoate

Dimethicone

Propanediol

Ascorbyl Glucoside

Algae Extract

Sucrose

Acetyl Glucosamine

Hydroxyethyl Urea

Lens Esculenta Fruit Extract

Citrullus Lanatus Fruit Extract

Pyrus Malus Fruit Extract

Molasses Extract

Myrtus Communis Leaf Extract

Avena Sativa Kernel Extract

Triticum Vulgare Germ Extract

Hordeum Vulgare Extract

Cladosiphon Okamuranus Extract

Salicylic Acid

Hydrolyzed Prunus Domestica

Caffeine

Sodium Lactate

Dipotassium Glycyrrhizate

Squalane

Oryzanol

Resveratrol

Sodium Hyaluronate

Sodium PCA

Ethylhexylglycerin

Bis-PEG-18 Methyl Ether Dimethyl Silane

Tocopheryl Acetate

PEG-75

Oleth-3 Phosphate

Sorbitol

Caprylyl Glycol

Oleth-3

Sodium Polyaspartate

Oleth-5

Acrylates/C10-30 Alkyl Acrylate Crosspolymer

Propylene Glycol Caprylate

Dextrin

Faex Extract

Choleth-24

Carbomer

Sodium Hydroxide

Ceteth-24

Xanthan Gum

Parfum

Glyceryl Acrylate/Acrylic Acid Copolymer

Citric Acid

Sodium Citrate

Disodium EDTA

BHT

Potassium Sorbate

Sodium Benzoate

Phenoxyethanol

Water, Butylene Glycol, Glycerin, Glycereth-26, Isononyl Isononanoate, Dimethicone, Propanediol, Ascorbyl Glucoside, Algae Extract, Sucrose, Acetyl Glucosamine, Hydroxyethyl Urea, Lens Esculenta Fruit Extract, Citrullus Lanatus Fruit Extract, Pyrus Malus Fruit Extract, Molasses Extract, Myrtus Communis Leaf Extract, Avena Sativa Kernel Extract, Triticum Vulgare Germ Extract, Hordeum Vulgare Extract, Cladosiphon Okamuranus Extract, Salicylic Acid, Hydrolyzed Prunus Domestica, Caffeine, Sodium Lactate, Dipotassium Glycyrrhizate, Squalane, Oryzanol, Resveratrol, Sodium Hyaluronate, Sodium PCA, Ethylhexylglycerin, Bis-PEG-18 Methyl Ether Dimethyl Silane, Tocopheryl Acetate, PEG-75, Oleth-3 Phosphate, Sorbitol, Caprylyl Glycol, Oleth-3, Sodium Polyaspartate, Oleth-5, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Propylene Glycol Caprylate, Dextrin, Faex Extract, Choleth-24, Carbomer, Sodium Hydroxide, Ceteth-24, Xanthan Gum, Parfum, Glyceryl Acrylate/Acrylic Acid Copolymer, Citric Acid, Sodium Citrate, Disodium EDTA, BHT, Potassium Sorbate, Sodium Benzoate, Phenoxyethanol

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

Tetrasodium EDTA

Polysorbate 20

T-Butyl Alcohol

Polysorbate 80

Denatonium Benzoate

Benzyl Alcohol

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

Alternatives

Ingredients Explained

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

Butylene Glycol (or BG) is used within cosmetic products for a few different reasons:

Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.

Though this ingredient works well with most skin types, some people with sensitive skin may experience a reaction such as allergic rashes, closed comedones, or itchiness.

Citric Acid is an alpha hydroxy acid (AHA) naturally found in citrus fruits like oranges, lemons, and limes.

Like other AHAs, citric acid can exfoliate skin by breaking down the bonds that hold dead skin cells together. This helps reveal smoother and brighter skin underneath.

However, this exfoliating effect only happens at high concentrations (20%) which can be hard to find in cosmetic products.

Due to this, citric acid is usually included in small amounts as a pH adjuster. This helps keep products slightly more acidic and compatible with skin's natural pH.

In skincare formulas, citric acid can:

While it can provide some skin benefits, research shows lactic acid and glycolic acid are generally more effective and less irritating exfoliants.

Most citric acid used in skincare today is made by fermenting sugars (usually from molasses). This synthetic version is identical to the natural citrus form but easier to stabilize and use in formulations.

Rosacea skin has a lower threshold for acids generally, with 62.5% of rosacea subjects in one study reacting to lactic acid in a sting test. This is why we mark citric acid as a potential rosacea trigger.

However, this ingredient shows up as a pH adjuster or chelator at roughly 0.1-1% in many products. These low levels are unlikely to be an issue for rosacea skin and becomes a potential trigger at exfoliating concentrations (20%). Because everybody's skin is unique, we recommend a patch test if you are unsure.

Glycerin (or glycerol) is a compound naturally found in your skin. It's a powerhouse humectant that pulls water into the stratum corneum.

Topically, glycerin does several things at once:

Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.

Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.

This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.

Just know very high concentrations (>40%) can feel tacky in low humidity.

Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.

Phenoxyethanol is one of the most widely used preservatives in skincare (and for good reason!).

It has a large spectrum of antimicrobial activity and especially effective bacteria, yeast, and mold while only having a weak effect on your skin's natural microbiome.

On a cellular level, it disrupts the cell membranes of microbes by poking holes that make the cell leak. This shuts down the chemical reactions the microbe needs to make energy so it can no longer survive.

Another perk of this ingredient is that it stays functional across a wide pH range (3-10).

You'll often see it paired with boosters like Ethylhexylglycerin; one study showed that a 1:9 ratio of Ethylhexylglycerin to Phenoxyethanol damages bacterial membranes as effectively as doubling the Phenoxyethanol concentration on its own.

Typical use concentrations range from 0.3-1% depending on the formula, and this ingredient is capped at 1% int the EU.

Safety-wise, the fear mongering does not hold up to the evidence. The EU's Scientific Committee on Consumer Safety and FDA consider it safe as a preservative at up to 1%, including for children of all ages.

Adverse systemic effects only showed up in animal studies at exposures roughly 200x higher than what people get from cosmetics. And despite its very widespread use, this ingredient is a rare sensitizer and allergic reactions are uncommon.

Potassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.

This ingredient comes from potassium salt derived from sorbic acid. Sorbic acid is a natural antibiotic and effective against fungus.

Both potassium sorbate and sorbic acid can be found in baked goods, cheeses, dried meats, dried fruit, ice cream, pickles, wine, yogurt, and more.

You'll often find this ingredient used with other preservatives.

Sodium Benzoate is a preservative. It's used in both cosmetic and food products to inhibit the growth of mold and bacteria. It is typically produced synthetically.

Both the US FDA and EU Health Committee have approved the use of sodium benzoate. In the US, levels of 0.1% (of the total product) are allowed.

Sodium benzoate works as a preservative by inhibiting the growth of bacteria inside of cells. It prevents the cell from fermenting a type of sugar using an enzyme called phosphofructokinase.

It is the salt of benzoic acid. Foods containing sodium benzoate include soda, salad dressings, condiments, fruit juices, wines, and snack foods.

Studies for using ascorbic acid and sodium benzoate in cosmetics are lacking, especially in skincare routines with multiple steps.

We always recommend speaking with a professional, such as a dermatologist, if you have any concerns.

Sodium Citrate is the sodium salts of citric acid. In skincare, it is used to alter pH levels and acts as a preservative.

Its main functions are to maintain the pH of a product and neutralize metal ions.

The acidity of our skin is maintained by our glands and skin biome; normal pH level of skin is slightly acidic (~4.75-5.5).

Being slightly acidic allows our skin to create an "acid mantle". This acid mantle is a thin barrier that protects our skin from bacteria and contaminants.

Sodium Hydroxide is also known as lye or caustic soda. It is used to adjust the pH of products; many ingredients require a specific pH to be effective.

In small amounts, sodium hydroxide is considered safe to use. However, large amounts may cause chemical burns due to its high alkaline.

Your skin has a natural pH and acid mantle. This acid mantle helps prevent harmful bacteria from breaking through. The acid mantle also helps keep your skin hydrated.

"Alkaline" refers to a high pH level. A low pH level would be considered acidic.

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. Remember to stay hydrated!

Xanthan gum is used as a stabilizer and thickener within cosmetic products. It helps give products a sticky, thick feeling - preventing them from being too runny.

On the technical side of things, xanthan gum is a polysaccharide - a combination consisting of multiple sugar molecules bonded together.

Xanthan gum is a pretty common and great ingredient. It is a natural, non-toxic, non-irritating ingredient that is also commonly used in food products.

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