Kate Ryan Vitamin C Daytime Repair Serum
A serum with 32 ingredients, including vitamin C, niacinamide, and hyaluronic acid.
Overview
What it is
Serum with 32 ingredients that contains hyaluronic acid, niacinamide, peptides and Vitamin C
Cool Features
It is vegan, cruelty-free, and reef safe
Suited For
It has ingredients that are good for fighting acne, anti aging, dry skin, brightening skin, sensitive skin, oily skin, reducing pores, scar healing, dark spots and better texture
Free From
It doesn't contain any harsh alcohols, common allergens, fragrances, oils, parabens or sulfates
Fun facts
Kate Ryan is from . This product is used in 2 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 (and what isn't)
Ingredients List
Dive into the full list of ingredients.
Water
Skin ConditioningTetrahexyldecyl Ascorbate
AntioxidantLactobacillus/Kelp Ferment Filtrate
Skin ConditioningSodium PCA
HumectantMagnesium Ascorbyl Phosphate
AntioxidantCarnosine
Skin ConditioningCarnitine
CleansingNiacinamide
SmoothingTetrahydrodiferuloylmethane
AntioxidantTetrahydrodemethoxydiferuloylmethane
AntioxidantTetrahydrobisdemethoxydiferuloylmethane
AntioxidantFerulic Acid
AntimicrobialHesperidin Methyl Chalcone
AntioxidantAscorbyl Palmitate
AntioxidantHyaluronic Acid
HumectantCamellia Sinensis Leaf Extract
AntimicrobialPhloretin
AntioxidantAloe Barbadensis Extract
Skin ConditioningGlutathione
Dimethylaminoethanol Tartrate
EmollientUbiquinone
AntioxidantResveratrol
AntioxidantCentella Asiatica Extract
CleansingLycopene
AntioxidantThioctic Acid
AntioxidantSuperoxide Dismutase
AntioxidantCatalase
Skin ConditioningSh-Oligopeptide-77
Skin ConditioningCitric Acid
BufferingCaprylyl Glycol
EmollientPhenoxyethanol
PreservativeSorbic Acid
PreservativeWater, Tetrahexyldecyl Ascorbate, Lactobacillus/Kelp Ferment Filtrate, Sodium PCA, Magnesium Ascorbyl Phosphate, Carnosine, Carnitine, Niacinamide, Tetrahydrodiferuloylmethane, Tetrahydrodemethoxydiferuloylmethane, Tetrahydrobisdemethoxydiferuloylmethane, Ferulic Acid, Hesperidin Methyl Chalcone, Ascorbyl Palmitate, Hyaluronic Acid, Camellia Sinensis Leaf Extract, Phloretin, Aloe Barbadensis Extract, Glutathione, Dimethylaminoethanol Tartrate, Ubiquinone, Resveratrol, Centella Asiatica Extract, Lycopene, Thioctic Acid, Superoxide Dismutase, Catalase, Sh-Oligopeptide-77, Citric Acid, Caprylyl Glycol, Phenoxyethanol, Sorbic Acid
Key Ingredients
Benefits
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. Stay hydrated!
Learn more about WaterTetrahexyldecyl 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:
Learn more about Tetrahexyldecyl AscorbateWe don't have a description for Lactobacillus/Kelp Ferment Filtrate yet.
Sodium PCA is the sodium salt of pyroglutamic acid. It is naturally occurring in our skin's natural moisturizing factors where it works to maintain hydration.
The PCA stands for pyrrolidone carboxylic acid, a natural amino acid derivative.
This ingredient has skin conditioning, anti-inflammatory, and humectant properties. Humectants help hydrate your skin by drawing moisture from the air. This helps keep your skin moisturized.
Learn more about Sodium PCAMagnesium Ascorbyl Phosphate (MAP) is a form of Vitamin C and is an antioxidant. It can help to reduce redness, improve skin texture, reduce the effects of aging, reduce the visibility of dark spots, and brighten skin.
MAP is created by combining ascorbic acid with magnesium salt. While MAP more gentle on the skin than ascorbic acid, it is thought to be less easily-absorbed into the skin.
Due to MAP's stability up to a pH level of 7, it is more stable to air and sunlight exposure than ascorbic acid. The best pH range for MAP is between 5 and 6.
Like other forms of Vitamin C, MAP has been shown to help reduce hyperpigmentation and simulate collagen production.
As an antioxidant, it helps protect your skin against the signs of aging.
Learn more about Magnesium Ascorbyl PhosphateCarnosine is a dipeptide made from two amino acids.
This ingredient helps:
Glycation is the process of sugars binding to and damaging proteins. Too much sugar in our skin can lead to damaged collagen, contributing to factors of aging.
Carnosine is water-soluble and is not able to travel deeper layers of skin. This leads to some doubt about whether it can boost collagen in skin, since collagen is located in the deeper layers of skin.
Fun fact: Carnosine can be naturally found in our muscles and brain.
Learn more about CarnosineWe don't have a description for Carnitine yet.
Niacinamide is a multitasking form of vitamin B3 that strengthens the skin barrier, reduces pores and dark spots, regulates oil, and improves signs of aging.
And the best part? It's gentle and well-tolerated by most skin types, including sensitive and reactive skin.
You might have heard of "niacin flush", or the reddening of skin that causes itchiness. Niacinamide has not been found to cause this.
In very rare cases, some individuals may not be able to tolerate niacinamide at all or experience an allergic reaction to it.
If you are experiencing flaking, irritation, and dryness with this ingredient, be sure to double check all your products as this ingredient can be found in all categories of skincare.
When incorporating niacinamide into your routine, look out for concentration amounts. Typically, 5% niacinamide provides benefits such as fading dark spots. However, if you have sensitive skin, it is better to begin with a smaller concentration.
When you apply niacinamide to your skin, your body converts it into nicotinamide adenine dinucleotide (NAD). NAD is an essential coenzyme that is already found in your cells as "fuel" and powers countless biological processes.
In your skin, NAD helps repair cell damage, produce new healthy cells, support collagen production, strengthen the skin barrier, and fight environmental stressors (like UV and pollution).
Our natural NAD levels start to decline with age, leading to slower skin repair, visible aging, and a weaker skin barrier. By providing your skin niacinamide, you're recharging your skin's NAD levels. This leads to stronger, healthier, and younger looking skin.
Another name for vitamin B3 is nicotinamide. This vitamin is water-soluble and our bodies don't store it. We obtain Vitamin B3 from either food or skincare. Meat, fish, wheat, yeast, and leafy greens contain vitamin B3.
The type of niacinamide used in skincare is synthetically created.
Learn more about NiacinamideTetrahydrodiferuloylmethane is an antioxidant.
Tetrahydrodemethoxydiferuloylmethane is an antioxidant.
Tetrahydrobisdemethoxydiferuloylmethane is an antioxidant.
Ferulic Acid is a plant based antioxidant. By fighting free-radicals, ferulic acid can help reduce the formation of fine lines and hyperpigmentation.
When used with Vitamin C, Ferulic Acid has shown to prevent Vitamin C from breaking down. In other words, it acts as a stabilizer.
Ferulic Acid is sometimes used to preserve food. Foods containing Ferulic Acid include: oats, rice, eggplant, citrus.
In medicine, Ferulic Acid is being studied for helping with diabetes, Alzheimer's, and cardiovascular diseases.
Learn more about Ferulic AcidHesperidin Methyl Chalcone is an antioxidant and is a type of silicone.
Ascorbyl Palmitate is created by combining pure Vitamin C and palmitic acid. It is an antioxidant and helps reduce hyperpigmentation.
This ingredient is a more stable version of Vitamin C, meaning it does not disintegrate as quickly when exposed to sunlight. However, studies show it does not penetrate skin as well as pure Vitamin C.
Ascorbyl Palmitate is oil soluble.
Read more about other types of Vitamin C:
Learn more about Ascorbyl PalmitateHyaluronic acid is naturally found in healthy skin. It is a humectant, meaning it draws moisture to your skin.
This ingredient helps hydrate, soothe, and protect the skin.
What makes hyaluronic acid so hydrating? It has the capacity to bind or hold large amounts of water.
Fun fact: It is already naturally found in our bodies, such as the fluids of our eyes and our joints.
Studies find this ingredient to have anti-inflammatory and anti-microbial properties. This can help speed up wound-healing.
Hyaluronic acid can be irritating if the molecule has a low-molecular weight, or if the molecules are small.
One study found low-molecular weight hyaluronic acid to be pro-inflammatory, meaning some people may experience irritation. This is because our bodies use hyaluronic acid in the wound-healing process to signal to our bodies, via irritation, that something needs healing.
The same study found high-molecular weight hyaluronic acid to be anti-inflammatory.
These are some other common types of Hyaluronic Acid:
Learn more about Hyaluronic AcidCamellia Sinensis Leaf Extract is derived from the leaves of the tea plant. Black tea, green tea, and oolong tea are all harvested from this plant.
This ingredient has many skin benefits:
This ingredient contains polyphenols, a strong antioxidant. Antioxidants help fight off molecules that damage skin cells.
On top of that, the antioxidants in green tea neutralize free-radicals from the sun. This gives the skin some extra UV protection, but should not replace sunscreen.
Many components of tea have anti-inflammatory properties.
Polyphenols and L-theanine help soothe the skin and reduce irritation. The caffeine in Camellia Sinensis Leaf Extract helps calm inflamed blood vessels.
Other compounds found in tea include: Vitamin Bs, linoleic acid, magnesium, calcium, iron, and zinc.
Research has shown both drinking Camellia Sinensis Leaf Tea and applying it to the skin can help boost skin elasticity and hydration. Studies also show using tea extract may reduce sebum, or oil, production.
Learn more about Camellia Sinensis Leaf ExtractPhloretin is a potent antioxidant. It can be naturally found in the leaves of apple trees and Manchurian apricots.
Aloe Barbadensis Extract is the extract of the whole Aloe plant. It has anti-inflammatory, moisturizing, antiseptic, and healing properties.
Aloe contains the antioxidants Vitamins A, C, and E. . These vitamins neutralize free radicals.
It also contains sugars in the form of monosaccharides and polysaccharides, folic acid, choline, many common minerals such as calcium, 12 anthraquinones, fatty acids, amino acids, and Vitamin B12.
The polysaccharides in aloe help moisturize your skin.
Despite helping with sunburn, aloe should not replace your sunscreen.
Learn more about Aloe Barbadensis ExtractGlutathione is an antioxidant naturally found in our bodies. It is made up of three amino acids: glycine, cysteine, and glutamic acid.
As an antioxidant, it prevents oxidative damage to parts of our cell.
While glutathione is said to help with fading dark spots, the results from research are inconclusive. Further studies are needed. With that said, gluthatione has been shown to protect our skin from UV-B induced damage.
This ingredient is naturally occurring in plants, animals, fungi, and some bacteria.
Learn more about GlutathioneWe don't have a description for Dimethylaminoethanol Tartrate yet.
Ubiquinone (Coenzyme Q10) is a molecule already found in our bodies. It is a potent antioxidant and skin-soothing ingredient.
Aging and environmental exposure diminishes our skin's natural ubiquinone levels. This is much like our natural collagen and elastin.
The good news is: studies show applying this ingredient topically replenishes ubiquinone levels in our skin. This also comes with a ton of skin benefits. These benefits include:
Ubiquinone is considered a large molecule and cannot be absorbed into the lower layers of skin. This is why it is believed to be such an effective antioxidant: it protects our skin in the upper layers and prevents damage in the deeper layers.
When used in sunscreen, ubiquinone is shown to increase ingredient stability, increase SPF factor, and add to infrared protection.
Fun fact: ubiquinone is fat-soluble.
Learn more about UbiquinoneResveratrol is a famous emerging antioxidant. It is a good alternative for sensitive skin types who cannot tolerate retinoids.
This antioxidant is most famous for it's anti-aging benefits. Studies show it combats the signs of aging by:
Besides anti-aging, this ingredient also helps with skin brightening and soothing.
The most effective forms of resveratrol are isobutyrate and butyrate. These have the strongest effect on increasing A1 collagen and reducing inflammation.
A note on it being a retinoid alternative:
Despite it's amazing skin benefits, it is not a replacement for retinoids. However, it is recommended for people with sensitive skin or intolerance to retinoids.
Resveratrol is naturally found in grapes, peanuts, and berries.
Learn more about ResveratrolCentella Asiatica Extract (Centella) is derived from an herb native to Southeast Asia. It is famous for its anti-inflammatory and soothing properties.
Centella is rich in antioxidants and amino acids, such as Madecassic Acid and Asiaticoside.
Studies show the compounds in centella help with:
The combination of all these properties makes centella effective at soothing, hydrating, and protecting the skin.
Other great components of centella include Vitamin A, vitamin C, several B vitamins, and Asiatic Acid.
Fun fact: Centella has been used as a medicine and in food for many centuries. As a medicine, it is used to treat burns, scratches, and wounds.
Learn more about Centella Asiatica ExtractLycopene is an antioxidant.
Thioctic Acid is an enzyme and antioxidant. A more common name for this is Alpha Lipoic Acid.
Alpha Lipoic Acid can be naturally found in the mitochondria of every cell.
Antioxidants help fight free-radicals. Free-radicals are molecules that may damage your skin cells. The antioxidants in Alpha Lipoic Acid have been shown to fight damage from cigarette smoke.
Studies also show Alpha Lipoic Acid plays a role in wound healing.
Thioctic Acid will break down when exposed to sunlight.
Many foods contain thioctic acid, including tomato, brussel sprouts, spinach, and broccoli.
Learn more about Thioctic AcidSuperoxide Dismutase is found in all living cells. This ingredient is AKA as 'SOD'.
SOD is a strong antioxidant. It protects living cells against oxidative damage by breaking down radical molecules into regular oxygen and hydrogen peroxide.
Antioxidants help fight free-radical molecules that may damage your skin's DNA. This may help with the signs of aging. Due to its antioxidant property, it is used to help treat chronic inflammation.
In cosmetics, SOD is usually obtained from marine phytoplankton, bovine liver, horseradish, cantaloupe, and certain bacteria.
The three major families of SOD include: Copper/Zinc, Iron/Manganese, and Nickel.
When eating SOD-rich foods, our bodies break it down into amino acids before absorption. Foods that contain SOD include: melons, citrus, spinach, broccoli, kale, almonds, sunflower seeds, and blue-green algae.
Learn more about Superoxide DismutaseWe don't have a description for Catalase yet.
Sh-Oligopeptide-77 is a peptide.
Citric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).
As an AHA, Citric Acid removes the top layer of skin cells from the newer layer of skin underneath. This helps skin to remove dark spots and even out skin tone.
If you spot Citric Acid near the end of an ingredient list, it's likely there as a pH adjuster rather than an active ingredient.
Read more about some other popular AHA's here:
Learn more about Citric AcidCaprylyl Glycol is a humectant and emollient, meaning it attracts and preserves moisture.
It is a common ingredient in many products, especially those designed to hydrate skin. The primary benefits are retaining moisture, skin softening, and promoting a healthy skin barrier.
Though Caprylyl Glycol is an alcohol derived from fatty acids, it is not the kind that can dry out skin.
This ingredient is also used as a preservative to extend the life of products. It has slight antimicrobial properties.
Learn more about Caprylyl GlycolPhenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent microbial growth. By itself, it has a scent that is similar to that of a rose.
It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.
Sorbic Acid is a preservative. It is the most commonly used food preservative in the world.
Sorbic Acid is a natural antibiotic and highly effective at preventing the growth of fungus. It is less effective against bacteria.
Potassium Sorbate, another commonly-used preservative, is the potassium salt of Sorbic Acid.
Sorbic Acid may worsen eczema. We recommend speaking with a professional if you have any concerns.
Potassium sorbate and sorbic acid can be found in baked goods, cheeses, dried meats, dried fruit, ice cream, pickles, wine, yogurt, and more.
Learn more about Sorbic AcidReviews
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Where it's from
Kate Ryan 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 May 26, 2025 • Added by JohnnyArellano_113