Aquasource+ Electrolyte Dewy Gel 100h

Biotherm

Aquasource+ Electrolyte Dewy Gel 100h

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About this product

The Biotherm Aquasource+ Electrolyte Dewy Gel 100h is a moisturizer. Our analysis of its 26 ingredients (18 low-risk) rates it Excellent (94/100). 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
26
Low-risk
18
Fragrance
Contains fragrance
Origin
France
Data updated
Jun 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 8/3
Good for dry skin
Magnesium PCA Caprylyl Glycol Calcium PCA Sodium PCA Sodium Hyaluronate Glycerin PEG-20 Potassium PCA
Caution for dry skin
Glycerin Sodium Hydroxide PPG-6-Decyltetradeceth-30
Oily/Acne-Prone Skin No data
Sensitive Skin 1/4
Good for sensitive skin
Glycerin
Caution for sensitive skin
Glycerin Carvone Limonene Citral

Ingredients list

26 total
Lower hazard (1) Higher hazard (7)
All26 Skin Conditioning20 Humectant10 Fragrance6 Perfuming5 Solvent5 Hair Conditioning4 Flavoring Agent2 Deodorant2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(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
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
3
A
PEG-20
(Humectant, Solvent)
B
Potassium PCA
(Humectant)
1
A
Carbomer
(Emulsion Stabilising, Viscosity Increasing Agent, Gel Forming, Viscosity Controlling)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
B
Calcium PCA
(Humectant, Skin Conditioning)
B
PPG-6-Decyltetradeceth-30
(Emulsifying, Surfactant)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
1
B
Sodium PCA
(Hair Conditioning, Humectant, Antistatic Agent, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
Adenosine
(Skin Conditioning)
1
B
Magnesium PCA
(Humectant, Skin Conditioning)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
1
Vitreoscilla Ferment
(Skin Conditioning)
1
Trisodium Ethylenediamine Disuccinate
(Chelating Agent)
1
Acetyl Glucosamine
(Skin Conditioning)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
7
Citral
(Flavoring Agent, Fragrance, Masking)
Allergens
Allergens
Citrus Aurantium Amara Peel Oil
(Skin Conditioning)
Citrus Limon Peel Oil
(Fragrance, Perfuming, Skin Conditioning)
2
Carvone
(Flavoring Agent, Fragrance, Perfuming)
PARFUM
(Fragrance, Perfuming)

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

Vitamin E
Protects skin and soothes irritation.
Niacinamide
Strengthens, smooths, and brightens skin.
Hyaluronic Acid
Hydrates by attracting and holding water.
Antioxidants
Shields skin from free radical damage.

Benefits

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

Concerns

Contains eu allergen
Not fungal acne (malassezia) safe
Citral — higher EWG
May not suit sensitive skin

EWG flags hazard, not real-world risk — ratings don't account for how much of an ingredient a product contains. Treat these as things to research, not verdicts. How we score →

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Pentylene Glycol
Skin conditioning, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSolvent
PEG-20
Humectant, Solvent
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A HumectantSolvent
Potassium PCA
Humectant
Limited public safety data.Read moreShow less
EWG N/A CIR B Humectant
Carbomer
Emulsion stabilising, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingViscosity increasing agentGel formingViscosity controlling
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Calcium PCA
Humectant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B HumectantSkin conditioning
PPG-6-Decyltetradeceth-30
Emulsifying, Surfactant
Limited public safety data.Read moreShow less
EWG N/A CIR B EmulsifyingSurfactant
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
Adenosine
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Magnesium PCA
Humectant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B HumectantSkin conditioning
Caprylyl Glycol
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningEmollientHumectant
Vitreoscilla Ferment
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Trisodium Ethylenediamine Disuccinate
Chelating agent
Low-hazard ingredient.Read moreShow less
EWG 1 Chelating agent
Acetyl Glucosamine
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
+ 6 more — see the full ingredients list above
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
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Sodium PCA
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioningHumectantAntistatic agentSkin conditioning Good for Dry Skin
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens
Citral
Flavoring agent, Fragrance
Higher-hazard ingredient.Read moreShow less
EWG 7 Flavoring agentFragranceMasking Allergens

How to use

How to use

  • 1 Where it fits: Apply near the end of your routine, after thinner serums.
  • 2 Morning & evening: Suitable for both AM and PM use.

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.

Niacinamide 2–5% (up to 10%)

Most research uses 2–5%; some formulas go to 10%. Very high levels can cause flushing in sensitive skin.

Niacinamide

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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