Skin science article
Drunk Elephant A-Passioni Retinol Cream Versus Paula's Choice Resist Intensive Wrinkle-Repair Retinol Serum
Drunk Elephant A-Passioni Retinol Cream Versus Paula's Choice Resist Intensive Wrinkle-Repair Retinol Serum This anti-aging treatment is formulated around Retinol and Niacinamide to soften the look of wrinkles and refine skin texture. This anti-aging serum is
Drunk Elephant A-Passioni Retinol Cream Versus Paula's Choice Resist Intensive Wrinkle-Repair Retinol Serum
This anti-aging treatment is formulated around Retinol and Niacinamide to soften the look of wrinkles and refine skin texture.
This anti-aging serum is formulated around Retinol and Tetrahexyldecyl Ascorbate to soften the look of wrinkles and refine skin texture.
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Glycerin
Coco-Caprylate
Stearic Acid
Coconut Alkanes
Glyceryl Stearate
Niacinamide
Caprylic/Capric Triglyceride
Cetearyl Alcohol
Pentylene Glycol
Passiflora Edulis Seed Oil
Retinol
Simmondsia Chinensis Seed Oil
Sclerocarya Birrea Seed Oil
Prunus Armeniaca Kernel Oil
Cetyl Ethylhexanoate
Palmitoyl Tripeptide-1
Palmitoyl Tetrapeptide-7
Brassica Oleracea Acephala Leaf Extract
Brassica Oleracea Italica Extract
Tetrahexyldecyl Ascorbate
Chrysin
Persea Gratissima Oil
Linoleic Acid
Linolenic Acid
Ceramide NP
Xanthophylls
Phytosphingosine
Phytosterols
Jojoba Esters
Physalis Pubescens Fruit Juice
Stearyl Glycyrrhetinate
Oryza Sativa Extract
Glycine Soja Oil
Carthamus Tinctorius Seed Oil
Palmitoyl Hexapeptide-12
Cetyl Palmitate
Trehalose
Lauric Acid
Sodium Hyaluronate Crosspolymer
Olea Europaea Fruit Oil
Glucosamine Hcl
Tocopheryl Acetate
Coco-Caprylate/Caprate
Pisum Sativum Extract
Tocopherol
Bambusa Vulgaris Leaf/Stem Extract
Phenoxyethanol
Caprylyl Glycol
Carbomer
Trideceth-6 Phosphate
N-Hydroxysuccinimide
Ceteareth-20
Sodium Hydroxide
Laureth-23
Steareth-20
Propanediol
Chlorhexidine Digluconate
Polysorbate 20
Trisodium Ethylenediamine Disuccinate
Chlorphenesin
Potassium Sorbate
Ethylhexylglycerin
Water, Glycerin, Coco-Caprylate, Stearic Acid, Coconut Alkanes, Glyceryl Stearate, Niacinamide, Caprylic/Capric Triglyceride, Cetearyl Alcohol, Pentylene Glycol, Passiflora Edulis Seed Oil, Retinol, Simmondsia Chinensis Seed Oil, Sclerocarya Birrea Seed Oil, Prunus Armeniaca Kernel Oil, Cetyl Ethylhexanoate, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, Brassica Oleracea Acephala Leaf Extract, Brassica Oleracea Italica Extract, Tetrahexyldecyl Ascorbate, Chrysin, Persea Gratissima Oil, Linoleic Acid, Linolenic Acid, Ceramide NP, Xanthophylls, Phytosphingosine, Phytosterols, Jojoba Esters, Physalis Pubescens Fruit Juice, Stearyl Glycyrrhetinate, Oryza Sativa Extract, Glycine Soja Oil, Carthamus Tinctorius Seed Oil, Palmitoyl Hexapeptide-12, Cetyl Palmitate, Trehalose, Lauric Acid, Sodium Hyaluronate Crosspolymer, Olea Europaea Fruit Oil, Glucosamine Hcl, Tocopheryl Acetate, Coco-Caprylate/Caprate, Pisum Sativum Extract, Tocopherol, Bambusa Vulgaris Leaf/Stem Extract, Phenoxyethanol, Caprylyl Glycol, Carbomer, Trideceth-6 Phosphate, N-Hydroxysuccinimide, Ceteareth-20, Sodium Hydroxide, Laureth-23, Steareth-20, Propanediol, Chlorhexidine Digluconate, Polysorbate 20, Trisodium Ethylenediamine Disuccinate, Chlorphenesin, Potassium Sorbate, Ethylhexylglycerin
Cyclopentasiloxane
Dimethiconol
Neopentyl Glycol Diheptanoate
Dicaprylyl Carbonate
Phenyl Trimethicone
Squalane
Bisabolol
Tocotrienols
Lecithin
Laminaria Ochroleuca Extract
Avena Sativa Kernel Extract
Elaeis Guineensis Oil
Hexylene Glycol
Cyclopentasiloxane, Dimethiconol, Neopentyl Glycol Diheptanoate, Dicaprylyl Carbonate, Caprylic/Capric Triglyceride, Phenyl Trimethicone, Squalane, Bisabolol, Tetrahexyldecyl Ascorbate, Retinol, Tocotrienols, Tocopherol, Lecithin, Laminaria Ochroleuca Extract, Avena Sativa Kernel Extract, Elaeis Guineensis Oil, Stearyl Glycyrrhetinate, Hexylene Glycol, Caprylyl Glycol, Ethylhexylglycerin, Phenoxyethanol
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Alternatives
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Caprylic/Capric Triglyceride (aka MCT Oil) is a lightweight emollient, solvent, and texture enhancer. It is considered a skin-softener by helping to prevent moisture loss.
Though it behaves like an oil, it is not technically one due to its chemical composition. One perk of this ingredient is that it is very stable, resistant to oxidation, and unlikely to go rancid.
In practice, that translates to a long shelf life and a consistently elegant skin feel.
While there is an assumption Caprylic Triglyceride can clog pores due to it being derived from coconut oil, there is no research supporting this. Just patch test if you have concerns.
Fractionated coconut oil and MCT Oil are both listed as Caprylic/Capric Triglyceride according to INCI. This is because INCI names are based on the ingredient’s final chemical composition and not its marketing name or source.
This ingredient is treated as the gold standard fungal acne safe oil. Even though it is coconut derived, the problematic lauric acid is stripped out.
This leaves just caprylic (C8) and capric (C10) acid. These chain lengths actually trend antifungal; a 2020 study found caprylic acid was enough to disrupt Malassezia furfur cell membrane, with a caprylic acid derivative damaging membrane structures at concentrations as low as 0.2%.
Caprylyl Glycol is a humectant, skin conditioner, emollient, and preservative booster derived from either caprylic acid or synthetically created.
Typical use levels vary from 0.3-1% as a preservative booster and go up to 2% to condition skin.
Because it is not a free-fatty acid, this ingredient is fungal acne safe (there's nothing for Malassezia to feed on).
Ethylhexylglycerin is created from glycerin. It is a multitasker ingredient that:
The CIR Expert Panel found minimal skin absorption or sensitization of any kind in a safety assessment. Though this ingredient is considered well-tolerated, a small number of cases of allergic dermatitis have been published since 2002. Just be sure to patch test if you are unsure.
Industry-reported use ranges from 8% in rinse-off products and 2% in leave-on formulations.
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.
Retinol is one of the most studied anti-aging ingredients in skincare (and for good reason!).
It's a form of vitamin A that your skin converts into Retinoic Acid, the active molecule that actually does the work in your cells.
That conversion happens in two steps: your skin first turns Retinol into Retinaldehyde (also called Retinal), then turns Retinaldehyde into Retinoic Acid.
Retinol is converted to biologically active retinoic acid via retinaldehyde by dehydrogenases in a two-step oxidation process.
Each step is a little "upgrade" toward the active form which is part of why Retinol is gentler than prescription Retinoic Acid; your skin does the work gradually. This also explains where Retinol sits in the retinoid family.
Here is the retinoid family ranked roughly by strength: Retinyl Esters (like Retinyl Palmitate) < Retinol < Retinaldehyde < Retinoic Acid.
Retinoid activity increases in that order, while tolerance runs in reverse; retinyl esters are the gentlest and retinoic acid the most irritating.
The more conversion steps an ingredient needs, the gentler (and slower) it tends to be, so Retinol lands in a nice middle spot. It's more effective than the esters, gentler than prescription options.
Once it becomes Retinoic Acid, it binds to receptors inside your cells' nuclei (called RARs and RXRs). These receptor pairs bind to specific DNA motifs called retinoic acid response elements and act like switches that turn certain genes on or off.
In practice, this means a few things happen in a formula. It:
That last two are worth a closer look.
A study that tested Retinol directly (not just prescription Retinoic Acid) found that four weeks of retinol thickened the epidermis and switched on the genes for Collagen I and Collagen III, with more procollagen I and III showing up in the skin. And after twelve weeks, facial wrinkles were visibly reduced.
Retinoids more broadly stimulate the skin's synthesis of hyaluronan and other glycosaminoglycans, part of what gives skin a plumper, more hydrated look over time.
So even the gentler OTC form is doing real structural work (not just sitting on the surface).
It's also worth knowing Retinol isn't only a wrinkle ingredient; it can help with uneven tone, dark spots, rough texture, and the look of pores as well because it speeds up turnover and influences pigment.
The research backs this up as well.
A pooled analysis of six clinical studies found that 0.1% stabilized retinol improved all signs of photoaging versus vehicle as early as week 4 and through 12 weeks, with only a few mild cases of irritation.
Another study comparing concentrations found that 0.3% and 1% Retinol were similarly effective at remodeling photodamaged skin, but 0.3% caused fewer adverse reactions when used daily (a useful reminder that more isn't always better).
Retinol is about tenfold less potent than Retinoic Acid. This is why it works as a gentler, non-prescription option that builds results over time.
Typical concentrations range from 0.1-1%, with 0.1% to 0.3% being a well-supported sweet spot for visible benefits with good tolerability.
One quirk worth mentioning: Retinol is famously unstable.
It's highly sensitive to light and oxygen, and UV exposure breaks it down into a range of degradation products.
Real-world testing bears this out, with retinoid content in some products dropping anywhere from 0% to 80% after six months at room temperature, and even more at higher temperatures.
This is why good formulations lean on opaque, air-tight packaging (think tubes and pumps, not clear jars) and often "encapsulate" the Retinol to shield it.
Signs of oxidation include your product turning yellow or smelling "off". Keeping it somewhere cool and dark, and using it up within a few months of opening helps it stay effective.
The most common side effects are mild and temporary: usually some dryness, redness, or light peeling as your skin adjusts. These tend to settle with consistent and lower-frequency use.
Like all retinoids, Retinol works best with nightly use, a good moisturizer, and daytime sunscreen.
The "ramp up" method works well: start with Retinol once a week to give your skin time to adjust, which keeps irritation low. Slowly add more nights until you reach your goal frequency once your skin feels comfortable.
Retinoids also make your skin more sensitive to the sun in the first few weeks, so wear sunscreen every morning and protect your skin from direct sun while you build up tolerance.
One safety note: topical Retinoids aren't recommended during pregnancy or breastfeeding. Systemic absorption from creams is low but because high oral vitamin A is a known teratogen and topical safety data are limited, most clinicians recommend stopping retinoids when pregnant or trying to conceive.
We don't have a description for Stearyl Glycyrrhetinate yet.
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:
Tocopherol is a fat-soluble antioxidant known as Vitamin E.
You'll find this ingredient in the vast majority of skincare (for good reason). It works to neutralize free radicals, or unstable molecules generated by UV exposure, pollution, and other environmental stressors, before they can cause oxidative damage to your skin cells.
Topically applied tocopherol has been shown to protect against UV damage by ramping up the skin's own natural defense enzymes.
It also acts as a skin conditioning agent; some studies show that regular topical use can improve the skin's water-binding capacity over 2-4 weeks.
This ingredient is especially loved for being a team player. When combined with Vitamin C, the photoprotective effect of both ingredients roughly doubles and the combo also helps reduce UV-induced DNA damage.
This ingredient has some brightening potential but it's more of a prevention ingredient than spot-fader. Cell studies show it can slow down melanin production but it's worth noting that it's not the most powerful brightener out there.
In formulations, it also serves as a stabilizer that helps protect other oxidation-prone ingredients from degrading.
Concentrations usually range from 0.1-1% in most leave-on products.