What's In My Jar
Oh K! Overnight Hydration Sleep Mask
Oh K!

Oh K! Overnight Hydration Sleep Mask

Efficacy75/100IrritancyHigh
See all ingredients

Works for

Moisturizing
Glycerin, Hydrogenated poly(c6-14 olefin) + 6 more
Works
What the product description says
“Overnight Hydration Sleep Mask”
From product name

This product can help improve hydration of the skin with the two types of ingredients.

The first type is called “humectants”:
these ingredients help attract water. 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. The following ingredients in this product do the job: glycerin, hydrolyzed hyaluronic acid.

This product also contains ingredients called “occlusives”. They help reduce the speed with which our skin loses moisture to the outside environment. These ingredients also help soften the upper layer of the skin, so it feels less tight and nicer to the touch. The following ingredients in this product do the job: dimethicone, hydrogenated poly(c6-14 olefin).

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~3.6–5.4%
Hydrogenated poly(c6-14 olefin)Key active· EmollientEffect: MediumHelps soften the upper layer of the skin and create a nice product texture~2.9–4.3%
TrehaloseKey active· HumectantEffect: HighA sugar that attracts water to the upper layer of the skin~1.7–2.6%
DimethiconeKey active· Emollient, OcclusiveEffect: HighA silicone that helps to reduce water loss from the surface of the skin. Can temporarily "fill in" lines and wrinkles, absorb oil, and create a nice product finish~0.95–1.4%
Sodium hyaluronateKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin~0.3–0.7%
Hydrolyzed hyaluronic acidKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin. A version of it is naturally present in skin~0.15–0.7%
Caprylyl methiconeEffect: LowA type of silicone that helps to soften the upper layer of the skin and create a nice product finish on the skin~2.1–3.2%
AllantoinUnder-dosedHelps calm down inflammation in skin and can help reduce itching. Helps to repair the skin barrier and keep skin hydrated~0.35–0.8%

Can it cause trouble?

Irritancy
5 strong irritants: Parfum, Alpha-isomethyl ionone + 3 more — patch-test recommended
High risk
We flagged 10 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
ParfumAn aromatic blend of unspecified and possibly irritating ingredientsHigh~0.1–0.35%est.
Alpha-isomethyl iononeA fragrance. Potential allergen and can be irritatingHigh~0.1–0.35%est.
Benzyl benzoateFragrance with sweet balsamic smell. Help to preserve products and dissolve other ingredients. Could trigger allergic reactions and be irritatingHigh~0.05–0.25%est.
Hexyl cinnamalA fragrance with jasmine smell. A likely irritantHigh~0.05–0.2%est.
HydroxycitronellalA fragrance. A likely allergen and can be irritatingHigh~0.05–0.2%est.
1,2-hexanediolA preservativeMedium~0.6–1.4%est.
Polysorbate 60Helps oil and water mix togetherMedium~1.3–2%est.
Potassium hydroxideUsed to adjust the pH level of productsMedium~0.4–0.95%est.
Disodium edtaStabilizes the product formulationMedium~0.15–0.6%est.
EthylhexylglycerinA preservativeMedium~0.1–0.45%est.
Comedogenic
Clean of flagged comedogenic ingredients
None flagged

User reviews

Would you recommend?
No community reviews yet.

Be the first — your take helps the next person decide.

Ingredients

Filter by role to see what each ingredient is doing.

Water~40–60%
Formula
Irritation risk
Low

Plain old water

More about Water
Dipropylene glycol~6.8–10.1%
Formula
Irritation risk
Low

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

More about Dipropylene glycol
Glycerin~3.6–5.4%
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
Hydrogenated poly(c6-14 olefin)~2.9–4.3%
Key active
Irritation risk
Low
Works for
Moisturizing

Helps soften the upper layer of the skin and create a nice product texture

More about Hydrogenated poly(c6-14 olefin)
Caprylyl methicone~2.1–3.2%
Formula
Irritation risk
Low
Works for
Moisturizing

A type of silicone that helps to soften the upper layer of the skin and create a nice product finish on the skin

More about Caprylyl methicone
Trehalose~1.7–2.6%
Key active
Irritation risk
Low
Works for
Moisturizing

A sugar that attracts water to the upper layer of the skin

More about Trehalose
1,2-hexanediol~0.6–1.4%
Irritant · medium
Irritation risk
Medium

A preservative

More about 1,2-hexanediol
Polysorbate 60~1.3–2%
Irritant · medium
Irritation risk
Medium
Works for
Cleansing

Helps oil and water mix together

More about Polysorbate 60
Ammonium acryloyldimethyltaurate/vp copolymer~1.1–1.6%
Formula
Irritation risk
Low

Increases thickness of a product. Texture enhancer for oil-in-water emulsions

More about Ammonium acryloyldimethyltaurate/vp copolymer
Dimethicone~0.95–1.4%
Key active
Irritation risk
Low
Works for
MoisturizingMattifying

A silicone that helps to reduce water loss from the surface of the skin. Can temporarily "fill in" lines and wrinkles, absorb oil, and create a nice product finish

More about Dimethicone
Dimethicone/vinyl dimethicone crosspolymer~0.55–1.25%
Formula
Irritation risk
Low

Used to stabilize product formulations and create a nice product texture

More about Dimethicone/vinyl dimethicone crosspolymer
Carbomer~0.45–1.05%
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
Potassium hydroxide~0.4–0.95%
Irritant · medium
Irritation risk
Medium

Used to adjust the pH level of products

More about Potassium hydroxide
Allantoin~0.35–0.8%
Under-dosed
Irritation risk
Low
Works for
MoisturizingAnti-inflammatoryReduces irritationReduces rednessAnti-blemishExfoliation

Helps calm down inflammation in skin and can help reduce itching. Helps to repair the skin barrier and keep skin hydrated

More about Allantoin
Sodium hyaluronate~0.3–0.7%
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
Hydrolyzed hyaluronic acid~0.15–0.7%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Attracts water into the upper layer of the skin. A version of it is naturally present in skin

More about Hydrolyzed hyaluronic acid
Disodium edta~0.15–0.6%
Irritant · medium
Irritation risk
Medium

Stabilizes the product formulation

More about Disodium edta
Phenoxyethanol~0.15–0.55%
Formula
Irritation risk
Low

A preservative. It helps prevent bacterial growth in cosmetic products

More about Phenoxyethanol
Ethylhexylglycerin~0.1–0.45%
Irritant · medium
Irritation risk
Medium

A preservative

More about Ethylhexylglycerin
Parfum~0.1–0.35%
Irritant · high
Irritation risk
High

An aromatic blend of unspecified and possibly irritating ingredients

More about Parfum
Alpha-isomethyl ionone~0.1–0.35%
Irritant · high
Irritation risk
High

A fragrance. Potential allergen and can be irritating

More about Alpha-isomethyl ionone
Benzyl benzoate~0.05–0.25%
Irritant · high
Irritation risk
High

Fragrance with sweet balsamic smell. Help to preserve products and dissolve other ingredients. Could trigger allergic reactions and be irritating

More about Benzyl benzoate
Hexyl cinnamal~0.05–0.2%
Irritant · high
Irritation risk
High

A fragrance with jasmine smell. A likely irritant

More about Hexyl cinnamal
Hydroxycitronellal~0.05–0.2%
Irritant · high
Irritation risk
High

A fragrance. A likely allergen and can be irritating

More about Hydroxycitronellal
Ingredient list view

Water, Dipropylene glycol, Glycerin, Hydrogenated poly(c6-14 olefin), Caprylyl methicone, Trehalose, 1,2-hexanediol, Polysorbate 60, Ammonium acryloyldimethyltaurate/vp copolymer, Dimethicone, Dimethicone/vinyl dimethicone crosspolymer, Carbomer, Potassium hydroxide, Allantoin, Sodium hyaluronate, Hydrolyzed hyaluronic acid, Disodium edta, Phenoxyethanol, Ethylhexylglycerin, Parfum, Alpha-isomethyl ionone, Benzyl benzoate, Hexyl cinnamal, Hydroxycitronellal

Compare prices

Retailers ranked by price — lowest first.

Amazon US
Price unavailable Out of stock
Check

Affiliate links · As an Amazon Associate, WIMJ earns from qualifying purchases.

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!Overnight Hydration Sleep MaskYOUR PRODUCTRNWDER. RENEW Deep Moisture Sleeping MaskJMsolutionPanthelene Inteinsive Barrier MaskWONJIN EFFECTHydro Vial Mask Pro
Match—45%45%45%
Price—$19.25$25.60$17.00
Shared key ingredients—4 of 65 of 65 of 6
Key difference—NiacinamideNiacinamideAnhydroxylitol
Irritancy High Medium Medium Medium
Drying alcohol————
View product Shop Shop Shop
  • matches yours
  • differs
  • cheaper

More alternatives: A. by BOM Ultra Cool Leaf MaskNACIFIC Phyto Niacin Brightening Sleeping Mask

Cheaper alternatives? Browse formulas in the same category.
We compare ingredient profiles across our catalog — pick the closest match for your budget.
Open dupe finder

Product summary

"Oh K! - Overnight Hydration Sleep Mask" is effective for: Anti-inflammatory

This product could be helpful for: Moisturizing, but its actives are not the most effective or are not well-studied.

Ingredient callouts

  • Humectants (trehalose 1.70% - 2.60%, sodium hyaluronate 0.30% - 0.70%, hydrolyzed hyaluronic acid 0.15% - 0.70% and glycerin 3.60% - 5.40%). These ingredients help attract water to the upper layer of the skin and improve the skin hydration.

Price

The product retails for 6.40£ in the United Kingdom.

For a detailed price comparison: click here.

Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 9 studies and safety reviews.

  1. 1
    Glycerol and the skin: holistic approach to its origin and functionsncbi.nlm.nih.gov
  2. 2
    The influence of alkane chain length on the skin irritation potential of 1,2-alkanediolsncbi.nlm.nih.gov
  3. 3
    Dimethicone as a protective ingredient in topical medicationsjaad.org
  4. 4
    Final Report on the Safety Assessment of Dimethicone Copolyoljournals.sagepub.com
  5. 5
    Profile of wound healing process induced by allantoinscielo.br
  6. 6
    Hyaluronic acid: A key molecule in skin agingncbi.nlm.nih.gov
Oh K! Overnight Hydration Sleep Mask
Oh K!Overnight Hydration Sleep Mask
Find on Amazon

Affiliate links · As an Amazon Associate, WIMJ earns from qualifying purchases.

Find on Amazon

As an Amazon Associate, WIMJ earns from qualifying purchases.