C’s The Day Serum

Good (Skin) Days

Where to buy Possibly in stock

About this product

The Good (Skin) Days C’s The Day Serum is a emulsion. Our analysis of its 28 ingredients (22 low-risk) rates it Excellent (98/100). Based on its ingredients, it looks well-suited to oily / acne-prone, dry, and sensitive skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Emulsion
Ingredients
28
Low-risk
22
Fragrance
Fragrance-free
Origin
South Korea

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 4/4
Good for dry skin
Cetyl Ethylhexanoate Caprylic/Capric Triglyceride Butylene Glycol Glycerin
Caution for dry skin
Dextrin Xanthan Gum Glycerin Hydrogenated Lecithin
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Magnesium Ascorbyl Phosphate
Sensitive Skin 8/4
Good for sensitive skin
Arbutin Magnesium Ascorbyl Phosphate Sodium Bicarbonate Glycerin Hydroxydecyl Ubiquinone Tocopheryl Acetate Sodium Metabisulfite Panax Ginseng Berry Extract
Caution for sensitive skin
Crocus Sativus Flower Extract Caprylic/Capric Triglyceride Butylene Glycol Glycerin

Ingredients list

28 total
Lower hazard (1) Higher hazard (4)
All28 Skin Conditioning28 Antioxidant6 Solvent5 Skin Protecting4 Fragrance3 Humectant3 Masking3 Viscosity Controlling3
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning)
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
1,2-Hexanediol
(Solvent)
1
A
Sodium Bicarbonate
(Abrasive, Buffering Agent, Deodorant, Oral Care Agent, Oral Health Care Drug, Phadjuster, Skin Protecting)
1
Myrciaria Dubia Fruit Extract
(Skin Conditioning)
glycyrrhiza glabra root extract
(Bleaching, Perfuming, Skin Conditioning, Skin Conditioning Emollient, Smoothing, Soothing)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
A
Magnesium Ascorbyl Phosphate
(Antioxidant)
1
Arbutin
(Antioxidant, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
3
Tocopheryl Acetate
(Antioxidant, Skin Conditioning)
Bad for Oily Skin
Bad for Oily Skin
Coptis Japonica Extract
(Antidandruff Agent, Antimicrobial, Hair Conditioning, Skin Conditioning)
Panax Ginseng Berry Extract
(Skin Conditioning, Skin Protecting)
1
Crocus Sativus Flower Extract
(Masking)
1
Tuber Magnatum Extract
(Skin Conditioning)
1
Hibiscus Sabdariffa Flower Extract
(Skin Conditioning)
Theobroma Cacao Extract
(Skin Conditioning)
1
Glycereth-25 PCA Isostearate
(Skin Conditioning, Emulsifying)
1
Hydroxydecyl Ubiquinone
(Antioxidant)
4
A
Sodium Metabisulfite
(Antioxidant, Preservative, Reducing)
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)
1
Adenosine
(Skin Conditioning)
1
A
Dextrin
(Absorbent, Binding Agent, Bulking Agent, Viscosity Increasing Agent, Binding, Viscosity Controlling)
1
A
Caprylic/Capric Triglyceride
(Emollient, Masking, Perfuming, Skin Conditioning, Solvent)
1
B
Cetyl Ethylhexanoate
(Skin Conditioning, Emollient)
2
A
Hydrogenated Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Suspending Agent Nonsurfactant)

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

Butylene Glycol
Skin Conditioning, Humectant
ASCORBIC ACID
Antioxidant, Skin Conditioning
Glycerin
Humectant, Skin Protecting
Sodium Bicarbonate
Skin Protecting
Myrciaria Dubia Fruit Extract
Skin Conditioning
glycyrrhiza glabra root extract
Skin Conditioning, Soothing

Benefits

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

Concerns

Not fungal acne (malassezia) safe

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
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
Sodium Bicarbonate
Abrasive, Buffering agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A AbrasiveBuffering agentDeodorantOral care agentOral health care drugPhadjusterSkin protecting
Myrciaria Dubia Fruit Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
glycyrrhiza glabra root extract
Bleaching, Perfuming
Limited public safety data.Read moreShow less
EWG N/A BleachingPerfumingSkin conditioningSkin conditioning emollientSmoothingSoothing
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Magnesium Ascorbyl Phosphate
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antioxidant
Coptis Japonica Extract
Antidandruff agent, Antimicrobial
Limited public safety data.Read moreShow less
EWG N/A Antidandruff agentAntimicrobialHair conditioningSkin conditioning
Panax Ginseng Berry Extract
Skin conditioning, Skin protecting
Limited public safety data.Read moreShow less
EWG N/A Skin conditioningSkin protecting
Crocus Sativus Flower Extract
Masking
Low-hazard ingredient.Read moreShow less
EWG 1 Masking
Tuber Magnatum Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Hibiscus Sabdariffa Flower Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Theobroma Cacao Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Glycereth-25 PCA Isostearate
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioningEmulsifying
+ 9 more — see the full ingredients list above
Butylene Glycol
Fragrance, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSkin conditioningSolventViscositydecreasing agentHumectantMaskingViscosity 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
Arbutin
Antioxidant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 AntioxidantSkin conditioning Good for Dry Skin
Tocopheryl Acetate
Antioxidant, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 3 AntioxidantSkin conditioning Bad for Oily Skin

How to use

How to use

  • 1 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.

ASCORBIC ACID, Magnesium Ascorbyl Phosphate

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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