Paula's Choice C15 Super Booster Versus Lancôme Rénergie H.C.F Triple Serum

Paula's Choice C15 Super Booster Versus Lancôme Rénergie H.C.F Triple Serum

This brightening serum is formulated around Ascorbic Acid and Ferulic Acid to brighten dull-looking skin and soften the look of wrinkles.

This anti-aging serum is formulated around Niacinamide and 3-O-Ethyl Ascorbic Acid to soften the look of wrinkles and fade the look of dark spots.

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Ascorbic Acid

Dipropylene Glycol

Propanediol

Glycerin

Ethoxydiglycol

Sodium Hydroxide

PPG-26-Buteth-26

PEG-40 Hydrogenated Castor Oil

Bisabolol

Ferulic Acid

Sodium Phytate

Decylene Glycol

Tocopherol

1,2-Hexanediol

Sphingomonas Ferment Extract

Phenoxyethanol

Water, Ascorbic Acid, Dipropylene Glycol, Propanediol, Glycerin, Ethoxydiglycol, Sodium Hydroxide, PPG-26-Buteth-26, PEG-40 Hydrogenated Castor Oil, Bisabolol, Ferulic Acid, Sodium Phytate, Decylene Glycol, Tocopherol, 1,2-Hexanediol, Sphingomonas Ferment Extract, Phenoxyethanol

Butylene Glycol

Propylene Glycol

Alcohol

Niacinamide

Isopropyl Lauroyl Sarcosinate

Pentylene Glycol

CI 77891

Guanosine

Mica

Tocopheryl Acetate

Hydrolyzed Linseed Extract

Sodium Acetylated Hyaluronate

Sodium Benzoate

Phenylethyl Resorcinol

Stearic Acid

Adenosine

Caffeine

PEG-100 Stearate

Polyacrylate Crosspolymer-6

Silica Silylate

Palmitic Acid

Polysorbate 20

Polysorbate 80

Ammonium Polyacryloyldimethyl Taurate

Limonene

Xanthan Gum

Tin Oxide

Benzyl Alcohol

Isohexadecane

3-O-Ethyl Ascorbic Acid

Caprylyl Glycol

Capryloyl Salicylic Acid

Boron Nitride

Acrylamide/Sodium Acryloyldimethyltaurate Copolymer

Sorbitan Oleate

Myristic Acid

Geraniol

Octocrylene

Butyl Methoxydibenzoylmethane

Potassium Cetyl Phosphate

Octyldodecanol

Cetyl Alcohol

Octyldodecyl Xyloside

Citric Acid

Citronellol

Glyceryl Stearate

Parfum

Water, Dipropylene Glycol, Glycerin, Butylene Glycol, Propylene Glycol, Alcohol, Niacinamide, Isopropyl Lauroyl Sarcosinate, Pentylene Glycol, CI 77891, Guanosine, Mica, Tocopheryl Acetate, Hydrolyzed Linseed Extract, Sodium Acetylated Hyaluronate, Sodium Benzoate, Phenoxyethanol, Phenylethyl Resorcinol, Stearic Acid, Adenosine, Caffeine, PEG-100 Stearate, Polyacrylate Crosspolymer-6, Silica Silylate, Palmitic Acid, Polysorbate 20, Polysorbate 80, Ammonium Polyacryloyldimethyl Taurate, Limonene, Xanthan Gum, Tin Oxide, Benzyl Alcohol, Isohexadecane, 3-O-Ethyl Ascorbic Acid, Caprylyl Glycol, Capryloyl Salicylic Acid, Boron Nitride, Ferulic Acid, Acrylamide/Sodium Acryloyldimethyltaurate Copolymer, Sorbitan Oleate, Myristic Acid, Geraniol, Octocrylene, Butyl Methoxydibenzoylmethane, Potassium Cetyl Phosphate, Octyldodecanol, Cetyl Alcohol, Octyldodecyl Xyloside, Citric Acid, Citronellol, Glyceryl Stearate, Parfum

Reviews

Alternatives

Ingredients Explained

These ingredients are found in both products.

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

Dipropylene Glycol is a synthetically created humectant, stabilizer, and solvent.

This ingredient helps:

Dipropylene glycol is technically an alcohol, but it belongs to the glycol family (often considered part of the ‘good’ alcohols). This means it is hydrating and gentle on skin unlike drying solvent alcohols like denatured alcohol.

As a masking agent, Dipropylene Glycol can be used to cover the smell of other ingredients. However, it does not have a scent.

Studies show Dipropylene Glycol is considered safe to use in skincare.

Ferulic Acid is a plant based antioxidant that can be naturally found in the cell walls of grains like rice, oats, and corn. It has antioxidant and antimicrobial properties, and has the ability to boost the performance of other antioxidants as well.

A well-known study found that adding Ferulic Acid to a solution of Vitamins C and E doubled the photoprotection of skin. This is why you'll often see it paired with Vitamin C or Vitamin E serums rather than sold on its own.

A 2025 review of 18 human studies found that using Ferulic Acid (0.5-1%) daily for one to three months showed improvements in:

As far as allergies go, Ferulic acid is generally well-tolerated but can cause an allergic reaction in very rare cases. It's also worth noting that Ferulic acid is often extracted from plant sources like rice bran or wheat bran, so be sure to path test if you have known grain allergies.

Outside of skincare, researchers are also looking into Ferulic Acid for its potential benefits in areas like diabetes, Alzheimer's, and heart health.

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.

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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