SPF Scout · Product record
Jack Black Double Duty
SPF 20 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.
36 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.
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.
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.
Triheptanoin
Occlusive (CosIng functional class)Skin conditioning (CosIng functional class)Viscosity control (thickens or thins the formula)An occlusive oil that forms a layer on the skin to slow moisture loss, and it also adjusts how thick the product is. In practice it keeps skin from drying out and helps set the texture.
Phenethyl Benzoate
Emollient (softens and smooths skin)Fragrance ingredient (scent)Skin conditioning (CosIng functional class)This works as a fragrance and an emollient, meaning it softens and smooths skin feel. It adds scent while giving the product a smoother texture on skin.
Octyldodecyl Neopentanoate
Emollient (softens and smooths skin)Skin conditioning (CosIng functional class)An emollient that softens and smooths skin feel. In practice it gives the product a lighter, easier-to-spread texture.
C13-16 Isoparaffin
Solvent (dissolves other ingredients)A fluid solvent that dissolves and carries other ingredients in the formula. It keeps everything mixed together and spreading evenly.
listed as “C13-16 Isoalkane”
Dimethicone
Antifoaming (stops the formula foaming)Emollient (softens and smooths skin)Skin conditioning (CosIng functional class)Skin protecting (CosIng functional class)A silicone that softens and smooths skin feel and forms a protective layer on the surface. It also cuts down foam during production, keeping the formula settled.
Phenoxyethanol
Preservative (inhibits microbial growth)This is a preservative that fights microbes. It helps keep the product from spoiling over time.
Glycereth-26 is a humectant, meaning it draws in and holds moisture. It also adjusts the thickness of the product, helping give it the right texture.
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.
Hydroxypropyl Starch Phosphate
Bulking agent (adds volume)Viscosity control (thickens or thins the formula)A starch-based ingredient that adds bulk and adjusts thickness. It helps fill out the formula and control its texture.
Cetearyl Glucoside
Surfactant (cleanses or mixes oil and water)A cleansing agent that also helps oil and water mix. It keeps the watery and oily parts of the product blended together and helps lift away dirt.
Cetearyl Alcohol
Emollient (softens and smooths skin)Emulsion stabilizer (keeps oil and water mixed)Foam boosting (increases foam from other ingredients)Opacifier (makes the formula less see-through)Skin conditioning (CosIng functional class)Surfactant (cleanses or mixes oil and water)Viscosity control (thickens or thins the formula)A workhorse ingredient that softens skin feel, adjusts thickness, helps oil and water mix, and keeps the blend stable. In practice it thickens the product, keeps it from separating, gives a smooth feel, and can make the product look opaque. Despite its name, it behaves like a waxy solid, not a drying alcohol.
Carbomer
Emulsion stabilizer (keeps oil and water mixed)Gel forming (sets the formula into a gel)otherViscosity control (thickens or thins the formula)A thickener that adjusts how thick the product is and forms a gel. It also keeps oil and water blends from separating, holding the texture together.
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.
Undecylenoyl Glycine
Anti-seborrheic (CosIng functional class)Anti-sebum (CosIng functional class)Deodorant (masks or reduces odor)Hair conditioning (CosIng functional class)Preservative (inhibits microbial growth)Surfactant (cleanses or mixes oil and water)A multi-tasker that helps oil and water mix for cleansing and works to keep oil and microbes in check. It also acts as a deodorant and conditions hair.
Capryloyl Glycine
Anti-seborrheic (CosIng functional class)Anti-sebum (CosIng functional class)Deodorant (masks or reduces odor)Hair conditioning (CosIng functional class)Preservative (inhibits microbial growth)Surfactant (cleanses or mixes oil and water)A cleansing ingredient that also works as a deodorant and helps control sebum and microbes. It conditions hair and helps lift away dirt.
Octyldodecanol
Emollient (softens and smooths skin)Fragrance ingredient (scent)Skin conditioning (CosIng functional class)Solvent (dissolves other ingredients)An emollient that softens and smooths skin feel, and a solvent that helps dissolve other ingredients. It also carries fragrance. Together this means the product spreads smoothly and stays blended.
Sodium Hydroxide
Buffering (holds the formula at a set acidity)Denaturant (makes alcohol undrinkable)otherRestricted in the EUSodium Hydroxide is a strongly alkaline ingredient used in tiny amounts to fine-tune a formula's acidity (buffering). This keeps the product's pH steady. It can also act as a denaturant, altering another substance so it stays fit for use in cosmetics rather than being consumed.
Disodium EDTA
Chelating (binds metal ions in the formula)otherViscosity control (thickens or thins the formula)An ingredient that binds trace metals that would otherwise spoil the formula, and helps adjust its thickness. This keeps the product stable over time.
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.
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.
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.
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”
Tocopheryl Acetate
Antioxidant (slows the formula oxidizing)otherSkin conditioning (CosIng functional class)Tocopheryl Acetate is a form of vitamin E that acts as an antioxidant, helping keep the formula from going off. It also conditions the skin, softening its feel.
Haslea Ostrearia Extract
Skin conditioning (CosIng functional class)An extract from an alga, used to condition the skin. It helps keep skin feeling soft and smooth.
Palmaria Palmata Extract
Skin protecting (CosIng functional class)An extract of the red alga Palmaria palmata used as a skin-protecting ingredient. It helps shield the skin's surface. On labels it may appear under its alga name.
Calendula Officinalis Flower Extract
Fragrance ingredient (scent)Skin conditioning (CosIng functional class)A flower extract used to condition the skin, meaning it helps soften and smooth skin feel. It also adds scent to the product.
Lavandula Angustifolia Oil
Fragrance ingredient (scent)Tonic (CosIng functional class)Restricted in the EUThis is lavender oil, used to give the product its scent. It acts as a fragrance and a tonic ingredient.
listed as “Lavandula Angustifolia (Lavender) Oil”
An oil from Bourbon geranium flowers used as a fragrance. Its job is to give the product a scent.
Linalool is used mainly for fragrance and as a deodorant that adjusts the product's smell. Its job is to shape how the product scents.
Citronellol is a fragrance ingredient. Its job is to give the product a scent.
Geraniol is a fragrance ingredient that gives the product its scent. It also acts as a tonic, adding a fresh feel.
Leuconostoc/Radish Root Ferment Filtrate
Anti-seborrheic (CosIng functional class)Preservative (inhibits microbial growth)This is a radish root ferment filtrate with antimicrobial and anti-seborrheic roles. It works against microbes in the formula and helps manage oiliness.
Rosmarinus Officinalis Leaf Oil
Fragrance ingredient (scent)Skin conditioning (CosIng functional class)This is the essential oil from rosemary leaves and flowering tops, used to add scent and to condition skin. It gives the product a fragrance while helping skin feel conditioned.
listed as “Rosmarinus Officinalis (Rosemary) Leaf Oil”
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=36d81d6d-4f9b-692d-e063-6294a90ad559
- 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
- 36
- Record checksum
- sha256:eff6fc4af1de886ca8cdfd0dd3e5680bdd03a557e02992e82b7573e16484373d
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