Marine Algae Vitamin C Serum

Matsu

Where to buy Possibly in stock

About this product

The Matsu Marine Algae Vitamin C Serum is a serums, essence, ampoule. Our analysis of its 38 ingredients (29 low-risk) rates it Excellent (96/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
38
Low-risk
29
Fragrance
Fragrance-free
Origin
Türkiye

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 11/8
Good for dry skin
Glucose Sodium Acetylated Hyaluronate Sodium Hyaluronate Crosspolymer Caprylyl Glycol Butylene Glycol Sodium Hyaluronate Glycerin Hydroxypropyltrimonium Hyaluronate Hydrolyzed Hyaluronic Acid Hyaluronic Acid Camellia Sinensis Leaf Extract
Caution for dry skin
Rosa Canina Fruit Extract Centella Asiatica Extract Xanthan Gum Glycerin PPG-26-Buteth-26 Camellia Sinensis Leaf Extract Sodium Hydroxide Polysorbate 20
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Rosa Canina Fruit Extract Camellia Sinensis Leaf Extract
Sensitive Skin 6/7
Good for sensitive skin
Centella Asiatica Extract Spirulina Platensis Extract Glycerin Ferulic Acid Camellia Sinensis Leaf Extract Sodium Metabisulfite
Caution for sensitive skin
Butylene Glycol Glycerin Citrus Sinensis Peel Oil Expressed PPG-26-Buteth-26 Camellia Sinensis Leaf Extract Phenoxyethanol Limonene

Ingredients list

38 total
Lower hazard (1) Higher hazard (6)
All38 Skin Conditioning30 Humectant13 Solvent7 Viscosity Controlling6 Fragrance5 Perfuming5 Film Forming4 Emulsion Stabilising4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, 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
1
A
Hydroxyethylcellulose
(Binding Agent, Emulsion Stabilising, Film Forming, Viscosity Increasing Agent, Binding, Stabilising, Viscosity Controlling)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
2
A
PPG-26-Buteth-26
(Fragrance, Hair Conditioning, Skin Conditioning, Emulsifying, Surfactant)
1
Spirulina Platensis Extract
(Skin Protecting)
3
B
Polysorbate 20
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
2
Ferulic Acid
(Antioxidant, Preservative, Uv Absorber, Antimicrobial)
1
A
Disodium EDTA
(Chelating Agent, Viscosity Controlling)
1
B
Centella Asiatica Extract
(Cleansing, Skin Conditioning, Smoothing, Soothing, Tonic)
1
Lactobacillus Ferment
(Skin Conditioning)
1
Adenosine
(Skin Conditioning)
1
A
1,2-Hexanediol
(Solvent)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
1
A
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
1
A
Glucose
(Flavoring Agent, Humectant, Skin Conditioning Agent Miscellaneous)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
Chondrus Crispus Extract
(Skin Conditioning, Viscosity Controlling)
1
Hydroxypropyltrimonium Hyaluronate
(Film Forming, Humectant)
1
Hydrolyzed Hyaluronic Acid
(Hair Conditioning, Humectant, Skin Conditioning)
1
Sodium Acetylated Hyaluronate
(Humectant)
1
A
Hyaluronic Acid
(Skin Conditioning, Viscosity Increasing Agent, Antistatic Agent, Humectant, Moisturising)
1
Sodium Hyaluronate Crosspolymer
(Humectant, Skin Conditioning)
Hydrolyzed Sodium Hyaluronate
(Skin Conditioning)
1
Potassium Hyaluronate
(Skin Conditioning)
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
Citrus Aurantium Amara Fruit Extract
(Skin Conditioning)
1
B
Camellia Sinensis Leaf Extract
(Antimicrobial, Antioxidant, Astringent, Emollient, Humectant, Masking, Oral Care Agent, Skin Conditioning, Skin Protecting, Tonic, Uv Absorber)
Good for Oily Skin
Good for Oily Skin
Citrus Grandis Fruit Extract
(Astringent, Perfuming, Skin Conditioning, Tonic)
glycyrrhiza glabra root extract
(Bleaching, Perfuming, Skin Conditioning, Skin Conditioning Emollient, Smoothing, Soothing)
1
Rosa Canina Fruit Extract
(Astringent, Skin Conditioning, Tonic)
1
Citrus Sinensis Peel Oil Expressed
(Perfuming)
4
A
Sodium Metabisulfite
(Antioxidant, Preservative, Reducing)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens

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

ASCORBIC ACID
Antioxidant, Skin Conditioning
Pentylene Glycol
Skin Conditioning
Glycerin
Humectant, Skin Protecting
PPG-26-Buteth-26
Skin Conditioning
Spirulina Platensis Extract
Skin Protecting
Ferulic Acid
Antioxidant, Uv Absorber

Benefits

Good for dry skin
Good for oily/acne-prone skin

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
ASCORBIC ACID
Antioxidant, Buffering
Limited public safety data.Read moreShow less
EWG N/A AntioxidantBufferingFragranceSkin conditioning
Pentylene Glycol
Skin conditioning, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSolvent
Hydroxyethylcellulose
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingFilm formingViscosity increasing agentBindingStabilisingViscosity controlling
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
PPG-26-Buteth-26
Fragrance, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A FragranceHair conditioningSkin conditioningEmulsifyingSurfactant
Spirulina Platensis Extract
Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 Skin protecting
Ferulic Acid
Antioxidant, Preservative
Low-hazard ingredient.Read moreShow less
EWG 2 AntioxidantPreservativeUv absorberAntimicrobial
Disodium EDTA
Chelating agent, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Chelating agentViscosity controlling
Centella Asiatica Extract
Cleansing, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B CleansingSkin conditioningSmoothingSoothingTonic
Lactobacillus Ferment
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Adenosine
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
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
Caprylyl Glycol
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningEmollientHumectant
+ 16 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
Polysorbate 20
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant Fungal-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
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben
Camellia Sinensis Leaf Extract
Antimicrobial, Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B AntimicrobialAntioxidantAstringentEmollientHumectantMaskingOral care agentSkin conditioningSkin protectingTonicUv absorber Good for Oily Skin
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Morning only: Apply as the last step of your AM routine, after moisturiser, and reapply every ~2 hours of sun exposure.

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.

ASCORBIC ACID

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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