Hydro Boost Duo Care Fluid

Declare

Where to buy Possibly in stock

About this product

The Declare Hydro Boost Duo Care Fluid is a moisturizer. Our analysis of its 35 ingredients (28 low-risk) rates it Excellent (99/100). Based on its ingredients, it looks well-suited to dry skin. Heads up: it contains fragrance, which can irritate sensitive or reactive skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Moisturizers
Ingredients
35
Low-risk
28
Fragrance
Contains fragrance
Origin
Switzerland
Data updated
May 2026

The evidence

Quick Product Notes

Paraben-Free Sulfate-Free Alcohol-Free Silicone-Free EU Allergen-Free Fungal Acne (Malassezia) Safe

Notable Effects & Ingredients

No Notable Effects & Ingredients

Ingredients Related to Skin Types

Good   Bad — tap a skin type to see which ingredients · estimated from ingredient functions
Dry Skin 10/7
Good for dry skin
Glucose Saccharide Isomerate Caprylyl Glycol Butylene Glycol Glycerin Propylene Glycol Polyglucuronic Acid Propylheptyl Caprylate Glyceryl Caprate Lecithin
Caution for dry skin
C12-20 Alkyl Glucoside Xanthan Gum Glycerin Polyglyceryl-10 Laurate Sodium Hydroxide Glyceryl Caprate Lecithin
Oily/Acne-Prone Skin No data
Sensitive Skin 3/7
Good for sensitive skin
Ascorbyl Palmitate Glycerin Laminaria Digitata Extract
Caution for sensitive skin
Sodium Citrate Ascorbyl Palmitate Butylene Glycol Glycerin Propylene Glycol Citric Acid Phenoxyethanol

Ingredients list

35 total
Lower hazard (1) Higher hazard (4)
All35 Skin Conditioning22 Humectant11 Emulsion Stabilising8 Fragrance7 Solvent6 Viscosity Controlling6 Emulsifying5 Emollient4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
B
Propylheptyl Caprylate
(Emollient)
3
B
Propylene Glycol
(Fragrance, Humectant, Skin Conditioningagent Miscellaneous, Solvent, Viscosity Decreasing Agent, Skin Conditioning, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
1
Hydrolyzed Yeast Extract
(Skin Conditioning)
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
2
A
Glycerin
(Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care Agent, Oral Health Care Drug, Skin Protecting, Viscosity Decreasing Agent, Perfuming, Solvent)
Good for Dry Skin
Good for Dry Skin
Fungal Acne
Fungal Acne Trigger
Maris aqua
(Humectant, Solvent)
1
Saccharide Isomerate
(Humectant)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
2
3
Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Antistatic Agent, Emollient)
1
Padina Pavonica Thallus Extract
(Skin Conditioning)
SIMMONDSIA CHINENSIS SEED OIL
(Hair Conditioning, Skin Conditioning, Skin Conditioning Emollient)
2
3
Glyceryl Caprate
(Skin Conditioning, Emollient, Emulsifying, Surfactant)
1
Polyglucuronic Acid
(Film Forming, Humectant, Skin Conditioning)
1
A
Glucose
(Flavoring Agent, Humectant, Skin Conditioning Agent Miscellaneous)
Chondrus Crispus Extract
(Skin Conditioning, Viscosity Controlling)
1
A
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
1
Laminaria Digitata Extract
(Skin Protecting)
1
A
Carbomer
(Emulsion Stabilising, Viscosity Increasing Agent, Gel Forming, Viscosity Controlling)
1
A
Cetyl Hydroxyethylcellulose
(Emulsion Stabilising, Viscosity Increasing Agent, Film Forming, Viscosity Controlling)
1
C14-22 Alcohols
(Emulsion Stabilising)
1
B
C12-20 Alkyl Glucoside
(Emulsifying, Surfactant)
Polyglyceryl-2 Laurate
(Emulsifying)
1
B
Polyglyceryl-10 Laurate
(Skin Conditioning, Emulsifying, Surfactant)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
1
A
Sodium Citrate
(Ph Adjuster, Buffering Agent, Chelating, Masking)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
A
Ascorbyl Palmitate
(Antioxidant, Masking)
Fungal Acne
Fungal Acne Trigger
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
1
Tetrasodium Glutamate Diacetate
(Chelating Agent)
PARFUM
(Fragrance, Perfuming)
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
2
CI 42090
(Colorant, Cosmetic Colorant)

My Ingredient Notes

No personal ingredient notes yet. Save ingredients to your profile to get good/bad alerts here.

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Key ingredients

Antioxidants
Shields skin from free radical damage.
Vitamin C
Brightens, evens tone, and supports collagen.
Vitamin E
Protects skin and soothes irritation.

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
Barrier RepairStrengthen and restore your skin's natural barrier.
Redness ReducingSoothes visible redness and calms irritation.
Scar HealingImproves the look of marks and scars.
BrighteningRestores radiance to dull, tired skin.
Anti-AgingSoftens lines and helps skin look youthful.
Reduces IrritationEases discomfort and supports skin resilience.
Dark SpotsFades dark spots for even skin tone.

Concerns

Contains paraben
Not fungal acne (malassezia) safe
May not suit sensitive skin

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Propylheptyl Caprylate
Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Emollient
Hydrolyzed Yeast Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Pentylene Glycol
Skin conditioning, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSolvent
Maris aqua
Humectant, Solvent
Limited public safety data.Read moreShow less
EWG N/A HumectantSolvent
Saccharide Isomerate
Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Humectant
Xanthan Gum
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingSkin conditioningSurfactant -emulsifying agentViscosity increasing agentBindingGel formingViscosity controlling
Ethylhexylglycerin
Deodorant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A DeodorantSkin conditioning
Lecithin
Skin conditioning, Emulsifying
Low-to-moderate hazard.Read moreShow less
EWG 2–3 Skin conditioningEmulsifyingSurfactantAntistatic agentEmollient
Padina Pavonica Thallus Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
SIMMONDSIA CHINENSIS SEED OIL
Hair conditioning, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Hair conditioningSkin conditioningSkin conditioning emollient
Glyceryl Caprate
Skin conditioning, Emollient
Low-to-moderate hazard.Read moreShow less
EWG 2–3 Skin conditioningEmollientEmulsifyingSurfactant
Polyglucuronic Acid
Film forming, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Film formingHumectantSkin conditioning
Glucose
Flavoring agent, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Flavoring agentHumectantSkin-conditioning agent- miscellaneous
Chondrus Crispus Extract
Skin conditioning, Viscosity controlling
Limited public safety data.Read moreShow less
EWG N/A Skin conditioningViscosity controlling
+ 14 more — see the full ingredients list above
Propylene Glycol
Fragrance, Humectant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B FragranceHumectantSkin-conditioningagent - miscellaneousSolventViscosity decreasing agentSkin conditioningViscosity controlling Good for Dry Skin
Glycerin
Denaturant, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A DenaturantFragranceHair conditioningHumectantOral care agentOral health care drugSkin protectingViscosity decreasing agentPerfumingSolvent Good for Dry SkinFungal-acne trigger
Butylene Glycol
Fragrance, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSkin conditioningSolventViscositydecreasing agentHumectantMaskingViscosity controlling Good for Dry Skin
Citric Acid
Chelating agent, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 2 CIR A Chelating agentFragrancePh adjusterBuffering agentMasking Bad for Sensitive Skin
Ascorbyl Palmitate
Antioxidant, Masking
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A AntioxidantMasking Fungal-acne trigger
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben

How to use

How to use

  • 1 Where it fits: Apply near the end of your routine, after thinner serums.
  • 2 Morning works well: Antioxidants like vitamin C pair well with daytime use under sunscreen.

General guidance from this product's category and active ingredients — always follow the directions on the package.

Trust & honesty

Effective levels — general guide

The concentrations these actives are typically effective at in research — not a measurement of this product.

Vitamin C (ascorbic) 5–20%

L-ascorbic acid is usually used at 5–20% (around 10–15% is common). Above ~20% adds little and tends to irritate more; it also needs a low pH to work.

Ascorbyl Palmitate

INCI lists don't disclose amounts, and we don't claim to know this product's levels — these are the ranges these ingredients are usually effective at, so you can tell a real formula from "fairy-dusting" a marketed active. How we estimate this.

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