Tatcha Violet-C Brightening Serum 20% Vitamin C + 10% AHA Versus Dr. Dennis Gross Skincare C+ Collagen Brighten & Firm Vitamin C Serum

Tatcha Violet-C Brightening Serum 20% Vitamin C + 10% AHA Versus Dr. Dennis Gross Skincare C+ Collagen Brighten & Firm Vitamin C Serum

This brightening serum is formulated around Ascorbyl Tetraisopalmitate and Lactic Acid to brighten dull-looking skin and refine skin texture.

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

Bis-Glyceryl Ascorbate

Camellia Sinensis Leaf

Propanediol

Butylene Glycol

Glycerin

Ascorbyl Tetraisopalmitate

Angelica Acutiloba Root Extract

Callicarpa Japonica Fruit Extract

Prunus Mume Fruit Extract

Crataegus Cuneata Fruit Extract

Pyrus Malus Fruit Extract

Citrus Paradisi Fruit Extract

Citrus Aurantium Dulcis Juice

Citrus Limon Juice

Citrus Aurantifolia Juice

Glycyrrhiza Glabra Root Extract

Scutellaria Baicalensis Root Extract

Artemisia Capillaris Flower Extract

Morus Alba Root Extract

Ziziphus Jujuba Fruit Extract

Sodium Hyaluronate

Lactic Acid

Sodium Citrate

Dipotassium Glycyrrhizate

Ammonium Acryloyldimethyltaurate/Carboxyethyl Acrylate Crosspolymer

Disodium EDTA

PPG-6-Decyltetradeceth-30

Ethylhexylglycerin

Phenoxyethanol

Water, Bis-Glyceryl Ascorbate, Camellia Sinensis Leaf, Propanediol, Butylene Glycol, Glycerin, Ascorbyl Tetraisopalmitate, Angelica Acutiloba Root Extract, Callicarpa Japonica Fruit Extract, Prunus Mume Fruit Extract, Crataegus Cuneata Fruit Extract, Pyrus Malus Fruit Extract, Citrus Paradisi Fruit Extract, Citrus Aurantium Dulcis Juice, Citrus Limon Juice, Citrus Aurantifolia Juice, Glycyrrhiza Glabra Root Extract, Scutellaria Baicalensis Root Extract, Artemisia Capillaris Flower Extract, Morus Alba Root Extract, Ziziphus Jujuba Fruit Extract, Sodium Hyaluronate, Lactic Acid, Sodium Citrate, Dipotassium Glycyrrhizate, Ammonium Acryloyldimethyltaurate/Carboxyethyl Acrylate Crosspolymer, Disodium EDTA, PPG-6-Decyltetradeceth-30, Ethylhexylglycerin, Phenoxyethanol

3-O-Ethyl Ascorbic Acid

Niacinamide

Glycereth-7 Triacetate

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

Xanthan Gum

Polysorbate 20

T-Butyl Alcohol

Sodium Hydroxide

Polysorbate 80

Denatonium Benzoate

Benzyl Alcohol

Sodium Benzoate

Potassium Sorbate

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

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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.

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.

Lactic Acid is another well-loved alpha hydroxy acid (AHA). It is gentler than glycolic acid but still highly effective.

Its main role is to exfoliate the surface of the skin by loosening the “glue” that holds dead skin cells together. Shedding those old cells leads to smoother, softer, and more even-toned skin.

Because lactic acid molecules are larger than glycolic acid, they don’t penetrate as deeply. This means they’re less likely to sting or irritate, making it a great choice for beginners or those with sensitive skin.

Like glycolic acid, it can:

Lactic acid also acts as a humectant (like hyaluronic acid). It can draw water into the skin to improve hydration and also plays a role in the skin's natural moisturizing factor (NMF) in the form of sodium lactate.

Studies show it can boost ceramide production to strengthen the skin barrier and even help balance the skin’s microbiome.

To get results, choose products with a pH between 3-4.

Lower strengths (5-12%) focus on surface exfoliation; higher strengths (12% and up) can reach deeper in the dermis (deeper, supportive layer) to improve skin texture and firmness over time.

Though it was originally derived from milk, most modern lactic acid used in skincare is vegan. It is made through non-dairy fermentation to create a bio-identical and stable form suitable for all formulations.

When lactic acid shows up near the end of an ingredient list, it usually means the brand added just a tiny amount to adjust the product’s pH.

Legend has it that Cleopatra used to bathe in sour milk to help reduce wrinkles.

Lactic acid is truly a gentle multitasker: it exfoliates, hydrates, strengthens, and brightens. It's a great ingredient for giving your skin a smooth, glowing, and healthy look without the harshness of stronger acids.

Read more about some other popular AHA's here:

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.

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.

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!

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