PCA Skin Exlinea Pro Peptide Serum
A serum with 36 ingredients, including hyaluronic acid and peptides.
Overview
What it is
Serum with 36 ingredients that contains hyaluronic acid and peptides
Cool Features
It is cruelty-free and reef safe
Suited For
It has ingredients that are good for anti aging, dry skin, sensitive skin and scar healing
Free From
It doesn't contain any harsh alcohols, common allergens, oils, parabens, silicones or sulfates
Fun facts
PCA Skin is from United States. This product is used in 20 routines created by our community.
We independently verify ingredients and our claims are backed by peer-reviewed research. Does this product need an update? Let us know.
What's inside
Ingredients List
Water
Skin ConditioningGlycerin
HumectantPentylene Glycol
Skin ConditioningGlyceryl Isostearate
EmollientIsostearyl Isostearate
EmollientC13-15 Alkane
SolventBetaine
HumectantAcrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingXanthan Gum
EmulsifyingMethyl Gluceth-20
HumectantOryza Sativa Starch
AbsorbentPolyglyceryl-3 Laurate
EmulsifyingSodium Levulinate
Skin ConditioningCaprylyl Glycol
EmollientLevulinic Acid
PerfumingPolyglyceryl-6 Oleate
EmulsifyingHydrolyzed Wheat Protein
Skin ConditioningEthylhexylglycerin
Skin ConditioningHydrolyzed Soy Protein
HumectantSodium Hydroxide
BufferingTetrasodium Glutamate Diacetate
Butylene Glycol
HumectantPectin
Emulsion StabilisingHydroxyethylcellulose
Emulsion StabilisingArginine
MaskingProline
Skin ConditioningSerine
MaskingGlucose
HumectantAcetyl Octapeptide-3
HumectantBacillus/Soybean Ferment Extract
Skin ConditioningSodium Hyaluronate
HumectantChondrus Crispus Extract
Skin ConditioningAcetyl Hexapeptide-8
HumectantDisodium Phosphate
BufferingPolysorbate 60
EmulsifyingSodium Phosphate
BufferingWater, Glycerin, Pentylene Glycol, Glyceryl Isostearate, Isostearyl Isostearate, C13-15 Alkane, Betaine, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Xanthan Gum, Methyl Gluceth-20, Oryza Sativa Starch, Polyglyceryl-3 Laurate, Sodium Levulinate, Caprylyl Glycol, Levulinic Acid, Polyglyceryl-6 Oleate, Hydrolyzed Wheat Protein, Ethylhexylglycerin, Hydrolyzed Soy Protein, Sodium Hydroxide, Tetrasodium Glutamate Diacetate, Butylene Glycol, Pectin, Hydroxyethylcellulose, Arginine, Proline, Serine, Glucose, Acetyl Octapeptide-3, Bacillus/Soybean Ferment Extract, Sodium Hyaluronate, Chondrus Crispus Extract, Acetyl Hexapeptide-8, Disodium Phosphate, Polysorbate 60, Sodium Phosphate
Key Ingredients
Benefits
Concerns
Ingredients Explained
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!
Learn more about WaterGlycerin (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.
Learn more about GlycerinPentylene glycol is typically used within a product to thicken it. It also adds a smooth, soft, and moisturizing feel to the product. It is naturally found in plants such as sugar beets.
The hydrophilic trait of Pentylene Glycol makes it a humectant. As a humectant, Pentylene Glycol helps draw moisture from the air to your skin. This can help keep your skin hydrated.
This property also makes Pentylene Glycol a great texture enhancer. It can also help thicken or stabilize a product.
Pentylene Glycol also acts as a mild preservative and helps to keep a product microbe-free.
Some people may experience mild eye and skin irritation from Pentylene Glycol. We always recommend speaking with a professional about using this ingredient in your routine.
Pentylene Glycol has a low molecular weight and is part of the 1,2-glycol family.
Learn more about Pentylene GlycolGlyceryl Isostearate is a mixture made from glycerin and isostearic acid.
It is an emollient, meaning it helps keep your skin hydrated and soft. This ingredient is also used to make the texture of a product thicker.
Glyceryl Isostearate may not be fungal acne safe.
Learn more about Glyceryl IsostearateIsostearyl Isostearate is a plant-based and vegan emollient ester made by reacting Isostearyl Alcohol and Isostearic Acid.
It helps improve how the product spreads on skin, acts as a binding agent for makeup powders without modifying pigment color, and softens skin while helping it hold onto water.
This ingredient is very interesting as a hydrator; most moisturizers are either occlusives, humectants, or emollients. Isostearyl isostearate works through another route named "internal occlusion" by the head researcher.
Isostearyl isostearate nudges the skin's own lipids into a denser, more tightly packed arrangement. Packing the deeper layers of the stratum corneum together more efficiently means less water is able to escape.
This is a barrier-improving mechanism that hadn't been described before and plastic occlusion stress tests confirmed it improved the skin's water-permeability barrier function
Just one thing worth noting from the same review: this ingredient increased the penetration rate of a test drug through excised human skin. Though this ingredient is not classified as a penetration enhancer, it does interact with the barrier rather than sitting totally inert on top.
Fungal acne:
The Malassezia yeast feeds on fatty acids and esters in the C11-24 range. Since both halves of this molecules are C18, it may not be fungal acne safe.
C13-15 Alkane is a group of alkanes with 13 to 15 carbon atoms in the alkyl chain.
It is a solvent and texture enhancer. Solvents are used to keep ingredients together in a product. They can help dissolve ingredients to stable bases or help evenly distribute ingredients throughout the product.
Betaine is a humectant. Like hyaluronic acid, it helps attract and retain moisture in the skin. Itâs known for being gentle and for helping the skin maintain balanced hydration.
Betaine is mainly used to improve hydration and support calmer skin. It helps skin cells regulate water balance because it functions as an osmolyte.
Some studies suggest betaine may support making skin tone more even.
Fun fact: Betaine naturally exists in the skin and the body. In cosmetic products, it can be either plant-derived (most commonly from sugar beets) or synthetically produced for consistency and stability.
Betaine is also known as trimethylglycine.
Learn more about BetaineAcrylates/C10-30 Alkyl Acrylate Crosspolymer is a synthetic polymer. It is used to thicken, emulsify, and improve the texture of products.
As an emulsifier, it helps stabilize oil-in-water emulsions to give products an elegant feel when applied.
It can also form a thin protective film on skin. One study found that a formula using this polymer helped slow down how quickly other ingredients (like DEET) were absorbed through skin.
A 2024 study of over 1,300 patients confirmed that sensitization to this ingredient is rare. It is also non-mutagenic and has a clean track record.
Learn more about Acrylates/C10-30 Alkyl Acrylate CrosspolymerXanthan 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.
Learn more about Xanthan GumMethyl Gluceth-20 is a humectant. Humectants help draw moisture from the air to your skin.
It is created by combining polyethylene glycol with glucose.
Oryza Sativa Starch is an absorbent and used to mattify the skin. It is a natural carbohydrate and the main component of rice. A more common name for this ingredient is 'rice starch'.
Rice starch is created by steeping broken grains in a caustic soda.
Rice extract has many skin benefits. Read more about rice extract here.
Learn more about Oryza Sativa StarchWe don't have a description for Polyglyceryl-3 Laurate yet.
Sodium levulinate is the a sodium salt of Levulinic Acid. Oncedissolved in an aqueous solution, the two ingredients become identical. It is usually derived from renewable plant sources like corn starch or sugarcane.
In skincare, it mostly acts as a skin conditioning agent that keeps skin soft and hydrated. It also acts as a preservative booster by inhibiting the growth of mold, yeast, and bacteria.
It's often paired with Sodium Anisate as the two create a broad-spectrum preservative system that is popular in "natural" formulations.
This ingredient is water-soluble.
The CIR Expert Panel for Cosmetic Ingredient Safety has concluded this ingredient to be non-irritated and there are no restrictions for use in EU cosmetics. The FDA also allows this ingredient to be used as a food-grade flavoring agent.
Learn more about Sodium LevulinateCaprylyl 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).
Learn more about Caprylyl GlycolLevulinic Acid is a fragrance that comes from the degradation of cellulose. It is a saturated fatty acid.
This ingredient is often used a building block for other compounds, such as in pharmaceuticals.
According to a manufacturer, this ingredient smells like caramel.
Learn more about Levulinic AcidPolyglyceryl-6 Oleate isn't fungal acne safe.
This ingredient is a plant-derived protein made by breaking down wheat proteins into smaller amino acids and peptides. It has skin and hair conditioning properties.
People with known wheat allergy or a history of immediate reactions should be cautious with leave-on products containing hydrolyzed wheat proteins.
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.
Learn more about EthylhexylglycerinHydrolyzed Soy Protein is a water-soluble blend of peptides and amino acids made by breaking down the protein from soybeans into smaller proteins.
It's the most widely used hydrolyzed vegetable protein in cosmetics and it acts mainly as a skin and hair conditioning agent.
The smaller fragments are water-loving so it forms a thin, moisture-retentive film on skin that helps reduce water loss and leaves things feeling softer and smoother.
You'll often see it credited with "firming" or "anti-aging" benefits as well; this claim traces back to lab research like Tokudome et al. (2012). This study added low-molecular-weight soybean peptides to cultured human skin fibroblasts and saw increased type I collagen gene expression + collagen content.
The caveat is that this is in-vitro and oral-peptide research so the only solid, well-established role for the topical ingredient is skin conditioning.
Typical use concentrations go up to 3.5% in mascara but this ingredient is typically used at low levels well under 1%.
It has a reassuring safety profile as well; it's not a skin irritant in testing up to 20% and has limited skin penetration due to its large size and water-loving nature.
Anyone with a known soy allergy should definitely patch test or skip this ingredient. There's also a single case of a soy-containing product aggravating rosacea via protein contact dermatitis, but this is very rare.
Learn more about Hydrolyzed Soy ProteinSodium 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.
Learn more about Sodium HydroxideTetrasodium Glutamate Diacetate is a chelating agent. Chelating agents help prevent metal ions from binding to other ingredients. This helps prevent unwanted effects and reactions from a product. These metal ions may come from water and are found in miniscule amounts.
Tetrasodium Glutamate Diacetate can also help other preservatives be more effective.
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.
Learn more about Butylene GlycolPectin is a fiber naturally found in the cell walls of plants.
It is commonly used a thickening agent in both food and cosmetics. In skincare, it prevents ingredients from separating.
Hydroxyethylcellulose is used to improve the texture of products. It is created from a chemical reaction involving ethylene oxide and alkali-cellulose. Cellulose is a sugar found in plant cell walls and help give plants structure.
This ingredient helps stabilize products by preventing ingredients from separating. It can also help thicken the texture of a product.
This ingredient can also be found in pill medicines to help our bodies digest other ingredients.
Learn more about HydroxyethylcelluloseArginine is a semi-essential amino acid. This just means our bodies can product a bit on its own, but sometimes needs a little boost from food sources.
It is a part of your skin's natural moisturizing factor (NMF), or the water-loving molecules in your outermost layer of skin (stratum corneum) that keeps everything hydrated and happy.
Here's an interesting thing about Arginine: your skin converts it into urea through the Krebs-Henseleit urea cycle. Urea is one of the most effective humectants your skin naturally produces.
A clinical study showed applying 2.5% arginine hydrochloride to atopic dermatitis skin showed significant urea levels in the stratum corneum and improved moisture in just four weeks.
Arginine is also a precursor to nitric oxide; nitric oxide improves microcirculation and supports wound healing and collagen synthesis.
One study found that an amino acid complex containing Arginine reduced skin irritation, improved hydration, and accelerated skin repair in clinical / in-vivo studies.
Arginine itself is an amino acid and not a fatty acid, oil, or ester. On its own, it's not a direct food source for Malassezia, or the yeast that causes fungal acne.
Learn more about ArginineProline is a non-essential amino acid, meaning your body can make it on its own. In skincare, it is a skin conditioning ingredient that keeps skin soft and hydrated.
It makes up about 23% of the collagen molecule (collagen is the protein responsible for keeping your skin firm) and is involved in your skin's natural hyaluronic acid production. When applied topically, proline can penetrate the skin fairly well due to its small molecular size.
Reviews of this ingredient have found it to be neither a dermal irritant nor a sensitizer.
Fun fact: Proline can be found in protein-rich foods like meat, fish, eggs, and dairy.
Learn more about ProlineSerine is a non-essential amino acid (your body makes it on its own!). It is a major player in your skin's natural moisturizing factor (NMF), or the water-loving molecules in your outermost layer of skin (stratum corneum) that keeps everything hydrated and happy.
Serine is one of your NMF's most abundant components that works as a skin-identical humectant. Its hydroxyl group grabs onto water molecules to boost hydration without any heaviness or occlusion.
Research on a hydrogel with serine confirmed this serine got delivered to your stratum corneum and demonstrated enhanced skin moisturization.
Interestingly serine also helps your skin produce filaggrin, a protein that keeps your skin barrier strong and used to create collagen.
Learn more about SerineGlucose is a simple sugar (a monosaccharide). In skincare, it is mostly a humectant and skin conditioning agent.
Mechanistically, it has multiple hydroxyl groups that hydrogen-bond to water. This pulls moisture into the upper layers of skin to keep the surface soft and hydrated.
It's worth knowing sugars are already a natural component of the skin's NMF (natural moisturizing factor) so it's a molecule that your stratum corneum is well-acquainted with.
Just so you know, glucose is hydrophilic (water-loving) and the stratum corneum is a strong barrier to hydrophilic compounds. This just means penetration is slow and most of the action is happening on the surface.
Gram-to-gram, glucose is not as efficient as a humectant as glycerin. This is why you'll likely see glycose paired with stronger humectants for a bigger hydration payoff.
In skincare, glucose is typically derived from corn or other starch sources.
Learn more about GlucoseAcetyl Octapeptide-3 is a synthetic peptide also commonly known as SNAP-8. It is a lab-made peptide often marketed as a gentler, topical alternative to Botox.
It works by mimicking part of a protein involved in muscle contractions, which may help relax facial tension and reduce the appearance of fine lines (mostly around the eyes and forehead).
Itâs considered a ânext-genâ version of Argireline (Acetyl Hexapeptide-8), an older peptide with more research behind it that also supports collagen production.
SNAP-8 showed slightly better results than Argireline in one small manufacturer-funded study, but thereâs limited independent research. Plus, most tests use concentrations higher than whatâs typically found in skincare products.
This ingredient might offer a subtle smoothing effect but it won't donât deliver the dramatic results of actual Botox injections.
Think of it more like a supporting actor in your skincare lineup.
Learn more about Acetyl Octapeptide-3This ingredient is created by fermenting soybean extract with the bacteria, bacillus. It has antioxidant and skin conditioning properties.
Sodium Hyaluronate is the salt form of hyaluronic acid. It is a long sugar chain that is naturally found in your skin, joints, and connective tissue that maintains hydration and elasticity.
In skincare, it works as a humectant. It pulls water from the environment and deeper layers of skin and binds it to the surface.
Interestingly, the size of the molecule affects its behavior:
Some clinical evidence links low molecular weight versions to improved wrinkle depth, elasticity, anti-inflammatory effects, and barrier repair.
Many serums use a blend of both weights so you can get surface hydration plus longer-lasting and deeper effects.
You'll typically see concentrations between 0.1-2% for this ingredient.
Learn more about Sodium HyaluronateChondrus Crispus Extract comes from a red algae native to the northern Atlantic coasts of Europe and North America. It helps hydrate the skin and is rich in antioxidants.
The antioxidants in chondrus crispus include lutein and zeaxanthin. Lutein has the ability to filter blue light from screens.
Other contents of chondrus crispus include polysaccharides, peptides, and amino acids. These help hydrate the skin.
What's the difference between algae and seaweed?
Algae is a broad term that includes seaweed. Not all algae is seaweed.
Acetyl Hexapeptide-8 (also known as Argireline) is a synthetic hexapeptide that is often called a "topical Botox alternative".
It works by mimicking how Botox relaxes muscles; it interferes with the signaling process that tells your facial muscles to contract. This can help soften expression lines like forehead wrinkles or crow's feet over time.
The comparison to Botox does have limits because the molecule is water-loving and relatively large.
Acetyl Hexapeptide-8 has a hard time absorbing deeply enough through the skin's outer barrier to actually reach the muscles.
So whether it truly works the way Botox does at a biological level is still up for debate, but early clinical outcomes are fairly encouraging.
A 12 week human study of a multi-ingredient regimen containing this ingredient saw:
While some studies have observed improvements in wrinkle appearance, it is important to note that more consistent results are seen in multi-ingredient formulations (vs just Acetyl Hexapeptide-8 alone).
Some research studies also used higher concentrations (up to 10%) while this ingredient is usually found in concentrations up to 0.005% in leave-on formulations.
Learn more about Acetyl Hexapeptide-8Disodium Phosphate is a water-soluble powder used as a pH adjuster and mild chelating agent. It basically holds a specific pH and binds stray metal ions so your product stays stable.
This ingredient is usually used at very low levels and concentrations range from 0.000054% - 2.9%. The CIR Expert Panel states this ingredient to be non-irritating at current use levels.
Polysorbate 60 is used to help stabilize products. It is a surfactant and emulsifier. These properties help keep ingredients together in a product. Surfactants help reduce surface tension between ingredients with different states, such as liquids and solids. Emulsifiers help prevent oils and waters from separating.
Polysorbate 60 is sorbitol-based and created from the ethoxylation of sorbitan. Ethoxylation is a chemical reaction used to add ethylene oxide. Sorbitan is a the dehydrated version of sorbitol, a sugar found in fruits.
In this case, the 60 comes from reacting 60 units of ethylene oxide with sorbitan.
Polysorbates are commonly used in medicine and foods.
Learn more about Polysorbate 60Sodium Phosphate is is behind-the-scenes formulation helper. Its main job is buffering, or locking in the product's pH.
This helps ensure the formula stays at its intended acidity through manufacturing, shipping, and sitting on your shelf. Many active ingredients like vitamin C or retinoids are pH sensitive so maintaining their happy pH range matters.
It is synthetic and reported use concentrations are very low (up to 0.086% in face powders).
Learn more about Sodium PhosphateReviews
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Where it's from
PCA Skin is a American brand
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The data we've presented on this page has been verified by a member of the SkinSort Team.
Read more about us· Updated August 20, 2024 • Added by brittanyjones