SPF Scout · Product record
Kao USA Inc. Hello Sunday The One Thats a Serum Hydrating Serum SPF 45
SPF 45 as labeled
U.S. formulation · record last retrieved 21 September 2026
What is listed
The ingredient declaration stored for this formulation, reproduced exactly as it was recorded from the source below.
47 entries · the stored declaration is recorded as complete.
What each ingredient generally does
Each entry that matched a canonical ingredient, with the function recorded for it. These notes describe the role an ingredient plays in a formulation. They do not assess an ingredient.
Octisalate
Light stabilizer (protects the formula from light)UV absorber (protects the formula from light, not a sunscreen filter)UV filter (filters UV rays)An organic UV filter that absorbs ultraviolet light, and doubles as a light stabilizer to keep the formula steady in sun. It also appears on labels as Ethylhexyl Salicylate.
Octocrylene
Light stabilizer (protects the formula from light)UV absorber (protects the formula from light, not a sunscreen filter)UV filter (filters UV rays)An organic UV filter that absorbs ultraviolet light. It also serves as a light stabilizer, helping keep other filters and the formula intact under sunlight.
Homosalate
Fragrance ingredient (scent)UV absorber (protects the formula from light, not a sunscreen filter)UV filter (filters UV rays)Restricted in the EUAn organic UV filter that absorbs ultraviolet light. It also adds scent to the product.
Avobenzone
Light stabilizer (protects the formula from light)UV absorber (protects the formula from light, not a sunscreen filter)UV filter (filters UV rays)An organic UV filter that absorbs ultraviolet light. It also acts as a light stabilizer, helping the formula hold up under sun exposure. On labels it also appears as Butyl Methoxydibenzoylmethane.
Water
Antiplaque (CosIng functional class)otherSkin conditioning (CosIng functional class)Solvent (dissolves other ingredients)The base liquid that most of the other ingredients dissolve or spread into. It carries the formula and helps condition the skin surface.
listed as “WATER (AQUA)”
Glycerin
Denaturant (makes alcohol undrinkable)Fragrance ingredient (scent)Hair conditioning (CosIng functional class)Humectant (holds moisture)Oral care (CosIng functional class)Skin conditioning (CosIng functional class)Skin protecting (CosIng functional class)Solvent (dissolves other ingredients)Viscosity control (thickens or thins the formula)Glycerin draws in and holds moisture while conditioning and protecting skin. It also dissolves other ingredients, adjusts thickness, and can add scent. On labels it may appear as glycerol.
Butyloctyl Salicylate
Emollient (softens and smooths skin)Hair conditioning (CosIng functional class)Skin conditioning (CosIng functional class)Solvent (dissolves other ingredients)A liquid that conditions skin and hair and acts as a solvent. It softens skin feel and helps dissolve and spread other ingredients in the mix.
C12-15 Alkyl Benzoate
Emollient (softens and smooths skin)Preservative (inhibits microbial growth)Skin conditioning (CosIng functional class)This is a lightweight oily ingredient that softens and smooths the skin. It also helps keep the product fresh by limiting microbe growth.
Silica
Abrasive (physically scrubs)Absorbent (takes up oil or water)Anticaking (keeps powder free-flowing)Bulking agent (adds volume)Opacifier (makes the formula less see-through)otherViscosity control (thickens or thins the formula)Silica is a fine mineral powder that soaks up excess moisture and oil, and adjusts how thick the product feels. It keeps powders from clumping, adds bulk, and can make a formula look more opaque. Its chemical name is silicon dioxide.
Pongamia Glabra Seed Oil
Hair conditioning (CosIng functional class)Skin conditioning (CosIng functional class)Pongamia Glabra Seed Oil is a conditioning oil for skin and hair. It softens and smooths, helping surfaces feel supple.
Undecane is an emollient that softens and smooths skin feel. It also helps condition the skin and can give the product an easier spread.
A moisture-grabbing ingredient that draws in and holds water. That keeps skin conditioned and helps it feel supple. It's the salt form of hyaluronic acid.
Glycine Soja Seed Extract
Skin conditioning (CosIng functional class)An extract from soybean seeds used as a skin conditioner. Its job is to soften and improve the feel of skin.
listed as “GLYCINE SOJA (SOYBEAN) SEED EXTRACT”
Glycine Soja Oil
Emollient (softens and smooths skin)Fragrance ingredient (scent)Skin conditioning (CosIng functional class)Glycine Soja Oil, also labeled as soybean oil, is an emollient that softens and smooths skin feel. It conditions the skin and adds fragrance to the product.
listed as “GLYCINE SOJA (SOYBEAN) OIL”
Pyrus Malus Fruit Extract
Skin conditioning (CosIng functional class)This is an extract of apple fruit, used as a skin-conditioning ingredient. That means it helps keep skin feeling soft and smooth. On labels, Pyrus malus is the apple.
listed as “PYRUS MALUS (APPLE) FRUIT EXTRACT”
Pongamia Pinnata Seed Extract
Skin conditioning (CosIng functional class)A seed extract used as a skin conditioner. It helps keep skin feeling soft and smooth.
Tocopherol
Antioxidant (slows the formula oxidizing)Fragrance ingredient (scent)Occlusive (CosIng functional class)otherSkin conditioning (CosIng functional class)Tocopherol is a form of vitamin E used as an antioxidant, which helps keep the formula from going off. It also conditions skin and forms a thin surface layer that slows moisture loss. You may see it listed simply as vitamin E.
Oryza Sativa Germ Extract
Emollient (softens and smooths skin)Skin conditioning (CosIng functional class)An extract from rice germ that softens and smooths skin feel. It helps the surface feel conditioned.
listed as “ORYZA SATIVA (RICE) GERM EXTRACT”
Oryza Sativa (Rice) Extract
Abrasive (physically scrubs)Absorbent (takes up oil or water)Bulking agent (adds volume)Hair conditioning (CosIng functional class)Skin conditioning (CosIng functional class)An extract of rice grains that conditions skin and hair, and can act as an abrasive and absorbent. It also adds bulk to the formula and can soak up excess moisture or oil.
Tetrahexyldecyl Ascorbate
Antioxidant (slows the formula oxidizing)otherSkin conditioning (CosIng functional class)This is an antioxidant and skin-conditioning ingredient, a form of vitamin C. As an antioxidant it helps keep the formula from going off, and it softens the skin feel.
Dunaliella Salina Extract
Skin conditioning (CosIng functional class)This is an extract from a type of algae that conditions the skin. It helps keep skin feeling soft and smooth.
Haematococcus Pluvialis Extract
Antioxidant (slows the formula oxidizing)This is an extract from a type of algae that works as an antioxidant. It helps protect the formula from the kind of breakdown that oxygen can cause.
Caesalpinia Spinosa Fruit Pod Extract
Hair conditioning (CosIng functional class)Hair waving or straightening (CosIng functional class)This is an extract from the fruit pods of the tara plant. It conditions the hair and can help with waving or straightening it.
Helianthus Annuus Sprout Extract
Skin conditioning (CosIng functional class)This is an extract from sunflower sprouts used as a skin-conditioning agent. It helps keep skin feeling soft and smooth.
listed as “HELIANTHUS ANNUUS (SUNFLOWER) SPROUT EXTRACT”
Fructose
Humectant (holds moisture)A sugar used as a humectant. It draws in and holds moisture to keep the product and skin from drying out.
Glucose
Humectant (holds moisture)Glucose draws in and holds moisture. That helps keep the product and skin from drying out.
An emollient that softens and smooths the skin. It gives the product a lighter, more spreadable feel on application.
Ethyl Ferulate
Antioxidant (slows the formula oxidizing)An antioxidant, which helps protect the formula from damage caused by oxygen. This can keep the product from going off as quickly once it's exposed to air.
Polyglyceryl-4 Laurate
Surfactant (cleanses or mixes oil and water)An emulsifier that helps the oil and water parts stay combined. That keeps the formula consistent and stops it from separating.
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion stabilizer (keeps oil and water mixed)Viscosity control (thickens or thins the formula)This is a copolymer used to thicken the formula and keep it stable. It adjusts thickness and helps stop the oil and water parts from separating, giving the product a consistent texture.
An antioxidant that helps keep the formula from going off over time. In practice it protects the product's other ingredients from breaking down.
Polyglyceryl-6 Laurate
Surfactant (cleanses or mixes oil and water)An emulsifier that helps oil and water mix. It keeps the water and oil parts blended together in the product.
Arachidyl Alcohol
Emollient (softens and smooths skin)Emulsion stabilizer (keeps oil and water mixed)Skin conditioning (CosIng functional class)Viscosity control (thickens or thins the formula)A multitasking ingredient that softens and smooths skin feel, adjusts the product's thickness, and keeps the mix stable. In practice, it helps give the formula its body and holds it together.
Cellulose Gum
Binder (holds the formula together)Emulsion stabilizer (keeps oil and water mixed)Film forming (leaves a thin coating)Fragrance ingredient (scent)otherViscosity control (thickens or thins the formula)Cellulose Gum adjusts the thickness of a product and helps hold it together. It thickens the formula, keeps the oil and water parts from separating, and forms a thin film. It also appears on labels as carboxymethylcellulose.
Polyglyceryl-3 Diisostearate
Surfactant (cleanses or mixes oil and water)An emulsifier that helps oil and water combine. It keeps the two parts of the product blended into a stable, uniform mix.
Behenyl Alcohol
Binder (holds the formula together)Emollient (softens and smooths skin)Emulsion stabilizer (keeps oil and water mixed)Skin conditioning (CosIng functional class)Viscosity control (thickens or thins the formula)A multitasker that softens and smooths skin while adjusting the product's thickness. It also helps hold the mix together and keeps the oil and water parts from separating.
Sodium Phytate is a chelating agent, meaning it binds trace metals that would otherwise spoil the formula. It also has an oral-care function.
Arachidyl Glucoside
Surfactant (cleanses or mixes oil and water)A surfactant that helps clean and helps oil and water mix. In practice, it keeps the water and oil parts blended into one smooth product.
Maltodextrin
Absorbent (takes up oil or water)Binder (holds the formula together)Emulsion stabilizer (keeps oil and water mixed)Film forming (leaves a thin coating)Hair conditioning (CosIng functional class)otherSkin conditioning (CosIng functional class)Maltodextrin is a multitasking carbohydrate. It soaks up excess liquid, holds ingredients together, keeps the oil-and-water mix stable, and forms a thin film while conditioning skin and hair.
Sodium Dilauramidoglutamide Lysine
Humectant (holds moisture)This is a humectant, meaning it draws in and holds moisture. In practice, it helps keep the product from drying out and adds moisture to skin.
Polysorbate 60
Surfactant (cleanses or mixes oil and water)Polysorbate 60 helps oil and water mix into a stable, even product. It doubles as a cleansing agent that helps lift away oil and dirt.
Sorbitan Isostearate
Surfactant (cleanses or mixes oil and water)An emulsifier that helps oil and water mix and stay together. This keeps the product from separating so it stays smooth and even.
A skin-conditioning ingredient. It helps the product leave skin feeling good.
Xanthan Gum
Binder (holds the formula together)Emulsion stabilizer (keeps oil and water mixed)Gel forming (sets the formula into a gel)otherSkin conditioning (CosIng functional class)Surfactant (cleanses or mixes oil and water)Viscosity control (thickens or thins the formula)A thickener that adjusts how thick the product is and forms a gel-like texture. It keeps oil and water mixed and stops the blend from separating, giving a stable, even feel.
Cellulose
Absorbent (takes up oil or water)Bulking agent (adds volume)Opacifier (makes the formula less see-through)Viscosity control (thickens or thins the formula)Cellulose is a fibrous material that soaks up excess oil and moisture and adds bulk to a formula. It also makes the product look more opaque and adjusts its thickness so it feels right in the tube.
Phenoxyethanol
Preservative (inhibits microbial growth)This is a preservative that fights microbes. It helps keep the product from spoiling over time.
Citric Acid
Buffering (holds the formula at a set acidity)Chelating (binds metal ions in the formula)Fragrance ingredient (scent)otherCitric Acid is a mild acid used to fine-tune a formula's pH. It keeps the acidity steady (buffering), binds trace metals that would spoil the formula (chelating), and can add a scent note.
Checking this against your own list
SPF Scout's Personal Ingredient Check runs in the app, on your device. This page cannot see a personal avoidance list. Your selections are stored on your phone and are never sent to this website. There is nowhere on our side for them to go.
In the app you choose the ingredients you already avoid, and every entry in this declaration that matches one of them is shown to you with the alias path that produced the match.
This comparison does not predict whether your skin will react.
Source quality
- Source
- DailyMed drug label
- Source record
- https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=0c913096-c000-4336-e063-6394a90a560c
- Retrieved
- 21 September 2026
- Market
- United States
- Version
- v1 of this U.S. formulation
- Source tier
- Official label document (not independently verified by us)
- Entries recorded
- 47
- Record checksum
- sha256:97ed190e58fad86531bd26567b6bae433aa395f8bfedde9e7ed9f98743f5cfbd
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