The First Peptide Boosting Serum

NATURE REPUBLIC

Where to buy Possibly in stock

About this product

The NATURE REPUBLIC The First Peptide Boosting Serum is a serums, essence, ampoule. Our analysis of its 58 ingredients (55 low-risk) rates it Excellent (100/100). Based on its ingredients, it looks well-suited to dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
58
Low-risk
55
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 13/3
Good for dry skin
Glutamic Acid Dipotassium Glycyrrhizate Betaine Squalane Acetyl Tetrapeptide-5 Acetyl Hexapeptide-8 Butylene Glycol Sodium Hyaluronate Glycerin Hydroxyethyl Urea Hydrolyzed Hyaluronic Acid Hyaluronic Acid Histidine
Caution for dry skin
Glycerin Polyglyceryl-10 Laurate Polyglyceryl-10 Stearate
Oily/Acne-Prone Skin No data
Sensitive Skin 5/21
Good for sensitive skin
Madecassoside Cysteine Asiaticoside Glycerin Allantoin
Caution for sensitive skin
Glycine Glutamic Acid Dipropylene Glycol Lysine Methionine Valine Serine Cysteine Aspartic Acid Asiaticoside Alanine Arginine Isoleucine Butylene Glycol Glycerin Tyrosine Threonine Phenylalanine Proline Histidine Tromethamine

Ingredients list

58 total
Lower hazard (1) Higher hazard (2)
All58 Skin Conditioning69 Hair Conditioning25 Fragrance21 Antistatic Agent18 Humectant14 Masking10 Viscosity Controlling6 Solvent6
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
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
Dipropylene Glycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Masking, Viscosity Controlling)
1
A
1,2-Hexanediol
(Solvent)
1
B
Betaine
(Hair Conditioning, Humectant, Antistatic Agent, Skin Conditioning, Viscosity Controlling)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
Methylpropanediol
(Solvent)
1
A
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
B
Centella Asiatica Leaf Extract
(Skin Conditioning)
1
A
Hyaluronic Acid
(Skin Conditioning, Viscosity Increasing Agent, Antistatic Agent, Humectant, Moisturising)
1
Hydrolyzed Hyaluronic Acid
(Hair Conditioning, Humectant, Skin Conditioning)
Oryza Sativa Bran Extract
(Skin Conditioning, Skin Protecting)
Phaseolus Radiatus Seed Extract
(Hair Conditioning, Skin Conditioning)
1
Glyceryl Polymethacrylate
(Film Forming, Viscosity Controlling)
1
Hydroxyethyl Urea
(Hair Conditioning, Humectant, Skin Conditioning)
1
B
Polyglyceryl-10 Laurate
(Skin Conditioning, Emulsifying, Surfactant)
1
A
Allantoin
(Skin Conditioning, Skin Protecting, Soothing)
Good for Oily Skin
Good for Oily Skin
Good for Sensitive Skin
Good for Sensitive Skin
2
A
Tromethamine
(Fragrance, Ph Adjuster, Buffering Agent, Masking)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
1
A
Dipotassium Glycyrrhizate
(Flavoring Agent, Skin Conditioning, Humectant)
1
Adenosine
(Skin Conditioning)
1
Polyglutamic Acid
(Skin Conditioning)
1
Sodium Phytate
(Chelating Agent, Oral Care Agent)
1
Madecassoside
(Antioxidant, Skin Conditioning)
1
Dipeptide Diaminobutyroyl Benzylamide Diacetate
(Skin Conditioning)
1
A
Beta-Glucan
(Bulking Agent, Skin Conditioning)
1
Asiaticoside
(Antioxidant, Skin Conditioning, Perfuming)
1
A
Glycine
(Buffering Agent, Fragrance, Hair Conditioning, Skin Conditioning Agent Miscellaneous, Antistatic Agent, Skin Conditioning)
1
A
Serine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Masking)
1
A
Glutamic Acid
(Fragrance, Hair Conditioning, Humectant, Antistatic Agent)
1
A
Aspartic Acid
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Masking)
1
A
Leucine
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
1
Acetyl Hexapeptide-8
(Humectant, Skin Conditioning)
1
A
Copper Tripeptide-1
(Skin Conditioning)
1
Palmitoyl Pentapeptide-4
(Skin Conditioning)
1
A
Alanine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Masking)
1
A
Lysine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent)
1
A
Arginine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Masking)
1
A
Tyrosine
(Fragrance, Hair Conditioning, Proprietary, Skin Conditioning Agent Miscellaneous, Antistatic Agent, Masking, Skin Conditioning)
1
A
Phenylalanine
(Fragrance, Hair Conditioning, Skin Conditioning)
1
A
Proline
(Fragrance, Hair Conditioning, Skin Conditioning)
1
A
Threonine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Hair Waving Or Straightening)
1
A
Valine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Masking)
1
A
Isoleucine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent)
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
1
A
Histidine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Humectant)
1
A
Cysteine
(Antioxidant, Fragrance, Hair Conditioning, Hair Waving/Straighteningagent, Reducing, Antistatic Agent, Hair Waving Or Straightening, Masking)
1
A
Methionine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent)
1
Acetyl Tetrapeptide-5
(Humectant)
1
A
Palmitoyl Tetrapeptide-7
(Skin Conditioning)
1
A
Palmitoyl Tripeptide-1
(Skin Conditioning)
1
A
Dextran
(Binding Agent, Bulking Agent, Binding, Viscosity Controlling)
1
Palmitoyl Tripeptide-8
(Skin Conditioning)
1
A
Squalane
(Emollient, Hair Conditioning, Refatting, Skin Conditioning)
1
B
Polyglyceryl-10 Stearate
(Skin Conditioning, Emulsifying, Surfactant)
1
A
Carbomer
(Emulsion Stabilising, Viscosity Increasing Agent, Gel Forming, Viscosity Controlling)

My Ingredient Notes

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Key ingredients

Butylene Glycol
Skin Conditioning, Humectant
Glycerin
Humectant, Skin Protecting
Betaine
Humectant, Skin Conditioning
Niacinamide
Skin Conditioning
Panthenol
Skin Conditioning
Sodium Hyaluronate
Skin Conditioning, Humectant

Benefits

Good for dry skin

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Dipropylene Glycol
Fragrance, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSolventViscosity decreasing agentMaskingViscosity controlling
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
Betaine
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioningHumectantAntistatic agentSkin conditioningViscosity controlling
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Methylpropanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Centella Asiatica Leaf Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioning
Hyaluronic Acid
Skin conditioning, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningViscosity increasing agentAntistatic agentHumectantMoisturising
Hydrolyzed Hyaluronic Acid
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningHumectantSkin conditioning
Oryza Sativa Bran Extract
Skin conditioning, Skin protecting
Limited public safety data.Read moreShow less
EWG N/A Skin conditioningSkin protecting
Phaseolus Radiatus Seed Extract
Hair conditioning, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Hair conditioningSkin conditioning
Glyceryl Polymethacrylate
Film forming, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 Film formingViscosity controlling
Hydroxyethyl Urea
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningHumectantSkin conditioning
Polyglyceryl-10 Laurate
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmulsifyingSurfactant
Tromethamine
Fragrance, Ph adjuster
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A FragrancePh adjusterBuffering agentMasking
+ 38 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
Panthenol
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentHair conditioningSkin conditioning 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
Allantoin
Skin conditioning, Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSkin protectingSoothing Good for Oily SkinGood for Sensitive Skin

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 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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