What's In My Jar
Oh K! Cucumber Sheet Mask
Oh K!

Oh K! Cucumber Sheet Mask

Efficacy75/100IrritancyHigh
See all ingredients

Works for

Moisturizing
Glycerin, Betaine + 8 more
Works
What the product description says
“Made in Korea from innovative active ingredients to hydrate and sooth tired skin, you will be left feeling fresh and energised.”
Source: Lookfantastic

This product contains good ingredients to attract water to the upper layer of the skin. These ingredients are called "humectants": betaine, glycerin.

When humectants are on the surface of the skin, they “pull in” the moisture from the outside environment, or from within deeper layers of the skin. If the air is dry, humectants can speed up the moisture loss from the skin. This is why it is a good idea to use another product on top of this one to help "seal in" the moisture (look for ingredients like dimethicone, squalane, oils and butters).

GlycerinKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant~4.5–6.7%
BetaineKey active· HumectantEffect: HighHelps attract water to the upper layer of the skin and improves the product texture~1.9–2.9%
Centella asiatica extractKey activeEffect: HighA plant extract that has been shown to be able to reduce inflammation in skin, support restoration of skin barrier function, as well as support collagen production. Contains active compounds called centelloids: asiaticoside, madecasosside, asiatic acid and madecassic acid. Might be helpful in preventing stretch marks. It can be itself be irritating though.~0.6–1.35%
Sodium hyaluronateKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin~0.1–0.45%
Cucumis sativus juice· EmollientEffect: LowCucumber juice. Might help attract water to the upper layer of the skin, but mostly works as plain water in skincare~1.6–2.4%
Butylene glycol· HumectantEffect: LowUsed to create a nice product texture and help delivery of other ingredients. Might be somewhat helpful in attracting water to the upper layer of the skin~1.3–1.9%
Glyceryl caprylate· EmollientEffect: LowAn emollient that can also help water and oil mix together, as well as prevent bacteria growth in products~0.3–0.7%
Scutellaria baicalensis root extract· HumectantEffect: LowA plant extract that might contain a compound baicalin that could be helpful in neutralizing free radicals and reducing inflammation in skin. The baicalin concentration in skincare products is often too low for an effective action. Can be used for its fragrant properties~0.05–0.2%
Aloe barbadensis leaf extractEffect: Low, below effective doseTraditionally used to treat sunburns, dermatitis and inflammation, but evidence for its effectiveness is lacking. The extract can contain humectants that help attract water into the skin~0.15–0.55%
Camellia sinensis leaf extractEffect: Low, below effective doseCan contain potent anti-oxidant compounds (abbreviated ECG, GCG, EGC, and EGCG) that might help protect the skin from free radicals. Can help calm down inflammation and has some anti-bacterial properties. Unfortunately, these antioxidants are unstable and lose their effectiveness very quickly in products. The concentration of the antioxidant compounds in the extract also tends to be low to be effective in topical formulation~0.05–0.3%
Anti-oxidation
Side benefit · Centella asiatica extract, Ginkgo biloba leaf extract + 4 more
May help

This product contains antioxidants (centella asiatica extract, ginkgo biloba leaf extract) that might be able to help neutralize free radicals in skin to lessen the damage it gets from the UV light (sun). There is not enough evidence to confirm their effectiveness in skin though.

Centella asiatica extractKey activeEffect: MediumA plant extract that has been shown to be able to reduce inflammation in skin, support restoration of skin barrier function, as well as support collagen production. Contains active compounds called centelloids: asiaticoside, madecasosside, asiatic acid and madecassic acid. Might be helpful in preventing stretch marks. It can be itself be irritating though.~0.6–1.35%
Ginkgo biloba leaf extractKey activeEffect: MediumA plant extract that might help neutralize free radicals and reduce inflammation in skin. It can be irritating~0.05–0.2%
Paeonia suffruticosa root extractEffect: Low~1.2–1.8%
Lonicera japonica flower extractEffect: LowA plant extract that might help neutralize free radicals in skin. Can contain volalite oils and be irritating~0.05–0.3%
Scutellaria baicalensis root extractEffect: LowA plant extract that might contain a compound baicalin that could be helpful in neutralizing free radicals and reducing inflammation in skin. The baicalin concentration in skincare products is often too low for an effective action. Can be used for its fragrant properties~0.05–0.2%
Camellia sinensis leaf extractUnder-dosedCan contain potent anti-oxidant compounds (abbreviated ECG, GCG, EGC, and EGCG) that might help protect the skin from free radicals. Can help calm down inflammation and has some anti-bacterial properties. Unfortunately, these antioxidants are unstable and lose their effectiveness very quickly in products. The concentration of the antioxidant compounds in the extract also tends to be low to be effective in topical formulation~0.05–0.3%
Anti-aging
Side benefit · Centella asiatica extract, Prunus persica leaf extract + 1 more
May help

This product contains centella asiatica extract. This ingredient might be able to help reduce and prevent fine lines and wrinkles, improve skin elasticity and firmness, but there is not enough evidence that it actually works.

Centella asiatica extractKey activeEffect: MediumA plant extract that has been shown to be able to reduce inflammation in skin, support restoration of skin barrier function, as well as support collagen production. Contains active compounds called centelloids: asiaticoside, madecasosside, asiatic acid and madecassic acid. Might be helpful in preventing stretch marks. It can be itself be irritating though.~0.6–1.35%
Prunus persica leaf extractEffect: Low, below effective doseMight be helpful in supporting collagen and ellastin production but solid research is lacking. Could be irritating~0.05–0.3%
Camellia sinensis leaf extractEffect: Low, below effective doseCan contain potent anti-oxidant compounds (abbreviated ECG, GCG, EGC, and EGCG) that might help protect the skin from free radicals. Can help calm down inflammation and has some anti-bacterial properties. Unfortunately, these antioxidants are unstable and lose their effectiveness very quickly in products. The concentration of the antioxidant compounds in the extract also tends to be low to be effective in topical formulation~0.05–0.3%

Can it cause trouble?

Irritancy
6 strong irritants: Alcohol, Parfum + 4 more — patch-test recommended
High risk
We flagged 20 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
AlcoholCan be drying and contribute to skin irritation. Used in formulars to dissolve other ingredients, create a thinner product consistency or for its antibacterial propertiesHigh~2.6–3.9%est.
Paeonia suffruticosa root extract—High~1.2–1.8%est.
Chamomilla recutita flower extractPlant extract that can have healing and anti-inflammatory properties. It is a potential allergen and can be irritatingHigh~0.3–0.7%est.
Sophora angustifolia root extract—High~0.1–0.3%est.
Lonicera japonica flower extractA plant extract that might help neutralize free radicals in skin. Can contain volalite oils and be irritatingHigh~0.05–0.3%est.
Prunus persica leaf extractMight be helpful in supporting collagen and ellastin production but solid research is lacking. Could be irritatingHigh~0.05–0.3%est.
Ginkgo biloba leaf extractA plant extract that might help neutralize free radicals and reduce inflammation in skin. It can be irritatingHigh~0.05–0.2%est.
Scutellaria baicalensis root extractA plant extract that might contain a compound baicalin that could be helpful in neutralizing free radicals and reducing inflammation in skin. The baicalin concentration in skincare products is often too low for an effective action. Can be used for its fragrant propertiesHigh~0.05–0.2%est.
ParfumAn aromatic blend of unspecified and possibly irritating ingredientsHigh~0.05–0.15%est.
Benzyl salicylateA fragrance. Is a likely irritantHigh~0.05–0.2%est.
LinaloolA fragrance. Can be irritatingHigh~0.05–0.15%est.
Butylphenyl methylpropionalA fragrance. Can trigger allergic reactions and be irritatingHigh~0.01–0.1%est.
Hexyl cinnamalA fragrance with jasmine smell. A likely irritantHigh~0.01–0.05%est.
Centella asiatica extractA plant extract that has been shown to be able to reduce inflammation in skin, support restoration of skin barrier function, as well as support collagen production. Contains active compounds called centelloids: asiaticoside, madecasosside, asiatic acid and madecassic acid. Might be helpful in preventing stretch marks. It can be itself be irritating though.Medium~0.6–1.35%est.
1,2-hexanediolA preservativeMedium~0.45–1%est.
Peg-60 hydrogenated castor oilHelps oil and water mix togetherMedium~0.4–0.95%est.
EthylhexylglycerinA preservativeMedium~0.15–0.55%est.
Potassium hydroxideUsed to adjust the pH level of productsMedium~0.15–0.55%est.
Aloe barbadensis leaf extractTraditionally used to treat sunburns, dermatitis and inflammation, but evidence for its effectiveness is lacking. The extract can contain humectants that help attract water into the skinMedium~0.15–0.55%est.
Disodium edtaStabilizes the product formulationMedium~0.05–0.2%est.
Comedogenic
Clean of flagged comedogenic ingredients
None flagged

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Ingredients

Filter by role to see what each ingredient is doing.

Water~40–60%
Formula
Irritation risk
Low

Plain old water

More about Water
Glycerin~4.5–6.7%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant

More about Glycerin
Dipropylene glycol~3.4–5.1%
Formula
Irritation risk
Low

Helps to dissolve other ingredients in a formulation. Slows down the rate of product drying

More about Dipropylene glycol
Alcohol~2.6–3.9%
Irritant · high
Irritation risk
High
Works for
Antibacterial

Can be drying and contribute to skin irritation. Used in formulars to dissolve other ingredients, create a thinner product consistency or for its antibacterial properties

More about Alcohol
Betaine~1.9–2.9%
Key active
Irritation risk
Low
Works for
Moisturizing

Helps attract water to the upper layer of the skin and improves the product texture

More about Betaine
Cucumis sativus juice~1.6–2.4%
Formula
Irritation risk
Low
Works for
Moisturizing

Cucumber juice. Might help attract water to the upper layer of the skin, but mostly works as plain water in skincare

More about Cucumis sativus juice
Butylene glycol~1.3–1.9%
Formula
Irritation risk
Low
Works for
Moisturizing

Used to create a nice product texture and help delivery of other ingredients. Might be somewhat helpful in attracting water to the upper layer of the skin

More about Butylene glycol
Paeonia suffruticosa root extract~1.2–1.8%
Irritant · high
Irritation risk
High
Works for
Anti-oxidation
More about Paeonia suffruticosa root extract
Centella asiatica extract~0.6–1.35%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Reduces irritationReduces rednessMoisturizingAnti-inflammatoryAnti-agingAnti-oxidationAnti-blemish

A plant extract that has been shown to be able to reduce inflammation in skin, support restoration of skin barrier function, as well as support collagen production. Contains active compounds called centelloids: asiaticoside, madecasosside, asiatic acid and madecassic acid. Might be helpful in preventing stretch marks. It can be itself be irritating though.

More about Centella asiatica extract
1,2-hexanediol~0.45–1%
Irritant · medium
Irritation risk
Medium

A preservative

More about 1,2-hexanediol
Peg-60 hydrogenated castor oil~0.4–0.95%
Irritant · medium
Irritation risk
Medium
Works for
Cleansing

Helps oil and water mix together

More about Peg-60 hydrogenated castor oil
Chamomilla recutita flower extract~0.3–0.7%
Irritant · high
Irritation risk
High
Works for
Anti-inflammatory

Plant extract that can have healing and anti-inflammatory properties. It is a potential allergen and can be irritating

More about Chamomilla recutita flower extract
Glyceryl caprylate~0.3–0.7%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

An emollient that can also help water and oil mix together, as well as prevent bacteria growth in products

More about Glyceryl caprylate
Xanthan gum~0.15–0.65%
Formula
Irritation risk
Low
Works for
Cleansing

Used to create a thicker product consistency

More about Xanthan gum
Carbomer~0.15–0.6%
Formula
Irritation risk
Low
Works for
Cleansing

Helps create a thicker or gel-like product texture. It is not a surfactant but can be used in gentle cleansing formulations

More about Carbomer
Ethylhexylglycerin~0.15–0.55%
Irritant · medium
Irritation risk
Medium

A preservative

More about Ethylhexylglycerin
Potassium hydroxide~0.15–0.55%
Irritant · medium
Irritation risk
Medium

Used to adjust the pH level of products

More about Potassium hydroxide
Sodium hyaluronate~0.1–0.45%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Attracts water into the upper layer of the skin

More about Sodium hyaluronate
Aloe barbadensis leaf extract~0.15–0.55%
Irritant · medium
Irritation risk
Medium
Works for
Moisturizing

Traditionally used to treat sunburns, dermatitis and inflammation, but evidence for its effectiveness is lacking. The extract can contain humectants that help attract water into the skin

More about Aloe barbadensis leaf extract
Sophora angustifolia root extract~0.1–0.3%
Irritant · high
Irritation risk
High
More about Sophora angustifolia root extract
Lonicera japonica flower extract~0.05–0.3%
Irritant · high
Irritation risk
High
Works for
Anti-oxidation

A plant extract that might help neutralize free radicals in skin. Can contain volalite oils and be irritating

More about Lonicera japonica flower extract
Camellia sinensis leaf extract~0.05–0.3%
Under-dosed
Irritation risk
Low
Works for
Anti-oxidationAntibacterialAnti-agingEvens skin toneMoisturizingAnti-blemish

Can contain potent anti-oxidant compounds (abbreviated ECG, GCG, EGC, and EGCG) that might help protect the skin from free radicals. Can help calm down inflammation and has some anti-bacterial properties. Unfortunately, these antioxidants are unstable and lose their effectiveness very quickly in products. The concentration of the antioxidant compounds in the extract also tends to be low to be effective in topical formulation

More about Camellia sinensis leaf extract
Prunus persica leaf extract~0.05–0.3%
Irritant · high
Irritation risk
High
Works for
Anti-aging

Might be helpful in supporting collagen and ellastin production but solid research is lacking. Could be irritating

More about Prunus persica leaf extract
Ginkgo biloba leaf extract~0.05–0.2%
Key activeIrritant · high
Irritation risk
High
Works for
Anti-oxidationAnti-blemishAntibacterialAnti-inflammatory

A plant extract that might help neutralize free radicals and reduce inflammation in skin. It can be irritating

More about Ginkgo biloba leaf extract
Scutellaria baicalensis root extract~0.05–0.2%
Irritant · high
Irritation risk
High
Works for
AntibacterialAnti-oxidationMoisturizingReduces irritationAnti-inflammatory

A plant extract that might contain a compound baicalin that could be helpful in neutralizing free radicals and reducing inflammation in skin. The baicalin concentration in skincare products is often too low for an effective action. Can be used for its fragrant properties

More about Scutellaria baicalensis root extract
Disodium edta~0.05–0.2%
Irritant · medium
Irritation risk
Medium

Stabilizes the product formulation

More about Disodium edta
Phenoxyethanol~0.05–0.15%
Formula
Irritation risk
Low

A preservative. It helps prevent bacterial growth in cosmetic products

More about Phenoxyethanol
Parfum~0.05–0.15%
Irritant · high
Irritation risk
High

An aromatic blend of unspecified and possibly irritating ingredients

More about Parfum
Benzyl salicylate~0.05–0.2%
Irritant · high
Irritation risk
High

A fragrance. Is a likely irritant

More about Benzyl salicylate
Linalool~0.05–0.15%
Irritant · high
Irritation risk
High

A fragrance. Can be irritating

More about Linalool
Butylphenyl methylpropional~0.01–0.1%
Irritant · high
Irritation risk
High

A fragrance. Can trigger allergic reactions and be irritating

More about Butylphenyl methylpropional
Hexyl cinnamal~0.01–0.05%
Irritant · high
Irritation risk
High

A fragrance with jasmine smell. A likely irritant

More about Hexyl cinnamal
Ingredient list view

Water, Glycerin, Dipropylene glycol, Alcohol, Betaine, Cucumis sativus juice, Butylene glycol, Paeonia suffruticosa root extract, Centella asiatica extract, 1,2-hexanediol, Peg-60 hydrogenated castor oil, Chamomilla recutita flower extract, Glyceryl caprylate, Xanthan gum, Carbomer, Ethylhexylglycerin, Potassium hydroxide, Sodium hyaluronate, Aloe barbadensis leaf extract, Sophora angustifolia root extract, Lonicera japonica flower extract, Camellia sinensis leaf extract, Prunus persica leaf extract, Ginkgo biloba leaf extract, Scutellaria baicalensis root extract, Disodium edta, Phenoxyethanol, Parfum, Benzyl salicylate, Linalool, Butylphenyl methylpropional, Hexyl cinnamal

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Worth comparing, line by line.

Match % combines shared ingredients, the first five ingredients, shared actives and hero ingredients, irritancy (lower counts in the alternative's favour), texture and body area. Only products in the same routine step are compared.

Side-by-side comparison of this product against its closest alternatives
Oh K!Cucumber Sheet MaskYOUR PRODUCTBootsUltra Fine Sheet Mask With Added Pomegranate ExtractHolika HolikaPure Essence Mask Sheet Charcoal x 5The Crème Shop x KAKAO FRIENDSAPEACH CALL ME SMOOTH Printed Essence Sheet Mask
Match—48%48%46%
Price——$2.50$4.00
Shared key ingredients—4 of 54 of 55 of 5
Key difference——PanthenolNiacinamide
Irritancy High Medium Medium Medium
Drying alcohol Contains drying alcohol ———
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Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 19 studies and safety reviews.

  1. 1
    Glycerol and the skin: holistic approach to its origin and functionsncbi.nlm.nih.gov
  2. 2
    Anti-Inflammatory Effect of Titrated Extract of Centella asiatica in Phthalic Anhydride-Induced Allergic Dermatitis Animal Modelmdpi.com
  3. 3
    Centella asiatica in cosmetologyncbi.nlm.nih.gov
  4. 4
    Triterpene Composition and Bioactivities of Centella asiatica mdpi.com
  5. 5
    Asiaticoside induction for cell-cycle progression, proliferation and collagen synthesis in human dermal fibroblastsonlinelibrary.wiley.com
  6. 6
    Assessment report on Centella asiatica (L.) Urban, herbaema.europa.eu
Oh K! Cucumber Sheet Mask
Oh K!Cucumber Sheet Mask
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As an Amazon Associate, WIMJ earns from qualifying purchases.