No. 1 Serum

Mutha

Where to buy Possibly in stock

About this product

The Mutha No. 1 Serum is a serums, essence, ampoule. Our analysis of its 30 ingredients (24 low-risk) rates it Excellent (100/100). 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
30
Low-risk
24
Fragrance
Fragrance-free
Origin
United States

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 7/3
Good for dry skin
Camellia Japonica Seed Oil Sodium Acetylated Hyaluronate Sodium Hyaluronate Crosspolymer Sodium Hyaluronate Glycerin Camellia Sinensis Leaf Extract Amorphophallus Konjac Root Extract
Caution for dry skin
Xanthan Gum Glycerin Camellia Sinensis Leaf Extract
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Camellia Sinensis Leaf Extract
Sensitive Skin 5/6
Good for sensitive skin
Glycerin Tetrahexyldecyl Ascorbate Ferulic Acid Camellia Sinensis Leaf Extract Aloe Barbadensis Leaf Juice
Caution for sensitive skin
Calendula Officinalis Flower Extract Glycerin Citric Acid Camellia Sinensis Leaf Extract Sodium Benzoate Potassium Sorbate

Ingredients list

30 total
Lower hazard (1) Higher hazard (3)
All30 Skin Conditioning25 Humectant7 Fragrance4 Masking4 Solvent4 Preservative3 Viscosity Controlling3 Perfuming3
EWG CIR Ingredient Name & Cosmetic Functions Notes
B
Aloe Barbadensis Leaf Juice
(Skin Conditioning)
Good for Sensitive Skin
Good for Sensitive Skin
1
Tetrahexyldecyl Ascorbate
(Antioxidant, 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
Camellia Japonica Seed Oil
(Emollient, Skin Conditioning)
1
Water
(Solvent)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
B
Ethylhexyl Olivate
(Skin Conditioning)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
Oryza sativa bran oil
(Skin Conditioning, Skin Conditioning Emollient)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
Sodium Hyaluronate Crosspolymer
(Humectant, Skin Conditioning)
Hydrolyzed Sodium Hyaluronate
(Skin Conditioning)
1
Sodium Acetylated Hyaluronate
(Humectant)
2
Ferulic Acid
(Antioxidant, Preservative, Uv Absorber, Antimicrobial)
glycyrrhiza glabra root extract
(Bleaching, Perfuming, Skin Conditioning, Skin Conditioning Emollient, Smoothing, Soothing)
1
Euterpe Oleracea Fruit Extract
(Hair Conditioning)
1
A
Calendula Officinalis Flower Extract
(Masking, Perfuming, 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
Amorphophallus Konjac Root Extract
(Film Forming, Humectant)
3
A
Hydrolyzed Rice Bran Extract
(Skin Conditioning)
Kefiran
(Skin Conditioning)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
B
Polyglyceryl-4 Oleate
(Emulsifying)
3
B
Sodium Acrylates Copolymer
(Binding Agent, Film Forming, Viscosity Increasing Agent, Binding, Opacifying, Viscosity Controlling)
1
Polyglutamic Acid
(Skin Conditioning)
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
3
A
Potassium Sorbate
(Fragrance, Preservative)
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin

My Ingredient Notes

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Key ingredients

Aloe Barbadensis Leaf Juice
Skin Conditioning
Tetrahexyldecyl Ascorbate
Antioxidant, Skin Conditioning
Glycerin
Humectant, Skin Protecting
Camellia Japonica Seed Oil
Emollient, Skin Conditioning
Ethylhexyl Olivate
Skin Conditioning
Niacinamide
Skin Conditioning

Benefits

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

Concerns

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

Ingredients explained

Tetrahexyldecyl Ascorbate
Antioxidant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 AntioxidantSkin conditioning
Camellia Japonica Seed Oil
Emollient, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientSkin conditioning
Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Ethylhexyl Olivate
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioning
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Oryza sativa bran oil
Skin conditioning, Skin conditioning emollient
Limited public safety data.Read moreShow less
EWG N/A Skin conditioningSkin conditioning emollient
Sodium Hyaluronate Crosspolymer
Humectant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 HumectantSkin conditioning
Hydrolyzed Sodium Hyaluronate
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Sodium Acetylated Hyaluronate
Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Humectant
Ferulic Acid
Antioxidant, Preservative
Low-hazard ingredient.Read moreShow less
EWG 2 AntioxidantPreservativeUv absorberAntimicrobial
glycyrrhiza glabra root extract
Bleaching, Perfuming
Limited public safety data.Read moreShow less
EWG N/A BleachingPerfumingSkin conditioningSkin conditioning emollientSmoothingSoothing
Euterpe Oleracea Fruit Extract
Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioning
Calendula Officinalis Flower Extract
Masking, Perfuming
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A MaskingPerfumingSkin conditioning
Amorphophallus Konjac Root Extract
Film forming, Humectant
Limited public safety data.Read moreShow less
EWG N/A Film formingHumectant
+ 10 more — see the full ingredients list above
Aloe Barbadensis Leaf Juice
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A CIR B Skin conditioning Good for Sensitive 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
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
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
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

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.

Tetrahexyldecyl Ascorbate

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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