Secret Weapon Vitamin C Serum

Lilac + Flint

Where to buy Possibly in stock

About this product

The Lilac + Flint Secret Weapon Vitamin C Serum is a serums, essence, ampoule. Our analysis of its 18 ingredients (13 low-risk) rates it Excellent (97/100). Based on its ingredients, it looks well-suited to oily / acne-prone and sensitive skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
18
Low-risk
13
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 3/5
Good for dry skin
Butylene Glycol Glycerin Camellia Sinensis Leaf Extract
Caution for dry skin
Xanthan Gum Glycerin Hydrogenated Lecithin Camellia Sinensis Leaf Extract Sodium Hydroxide
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Sodium Ascorbyl Phosphate Camellia Sinensis Leaf Extract
Sensitive Skin 4/4
Good for sensitive skin
Sodium Ascorbyl Phosphate Glycerin Camellia Sinensis Leaf Extract Tocopheryl Acetate
Caution for sensitive skin
Butylene Glycol Glycerin Camellia Sinensis Leaf Extract Linalool

Ingredients list

18 total
Lower hazard (1) Higher hazard (5)
All18 Skin Conditioning13 Solvent5 Humectant5 Antioxidant3 Fragrance3 Masking3 Viscosity Controlling3 Emulsion Stabilising2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Sodium Ascorbyl Phosphate
(Antioxidant)
3-O-ETHYL ASCORBIC ACID
(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
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
A
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
2
A
Hydrogenated Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Suspending Agent Nonsurfactant)
Oligopeptide-68
(Bleaching)
Tremella Fuciformis Extract
(Humectant, Skin Conditioning)
Oligopeptide-19
(Skin Conditioning)
3
Tocopheryl Acetate
(Antioxidant, Skin Conditioning)
Bad for Oily Skin
Bad for Oily Skin
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
1
Tetrasodium Glutamate Diacetate
(Chelating Agent)
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
3
A
PEG/PPG-18/18 Dimethicone
(Emulsifying)
5
Linalool
(Fragrance, Deodorant, Masking)
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

Antioxidants
Shields skin from free radical damage.
Vitamin C
Brightens, evens tone, and supports collagen.
Peptides
Supports skin hydration and improves firmness.
Vitamin E
Protects skin and soothes irritation.

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
Barrier RepairStrengthen and restore your skin's natural barrier.
BrighteningRestores radiance to dull, tired skin.
Redness ReducingSoothes visible redness and calms irritation.
Reduces Large PoresMinimizes the look of enlarged pores.
Scar HealingImproves the look of marks and scars.
Skin TextureSmooths rough patches and refines texture.
Anti-AgingSoftens lines and helps skin look youthful.

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Sodium Ascorbyl Phosphate
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antioxidant
3-O-ETHYL ASCORBIC ACID
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Hydrogenated Lecithin
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A Skin conditioningEmulsifyingSurfactantSuspending agent- nonsurfactant
Oligopeptide-68
Bleaching
Limited public safety data.Read moreShow less
EWG N/A Bleaching
Tremella Fuciformis Extract
Humectant, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A HumectantSkin conditioning
Oligopeptide-19
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Tetrasodium Glutamate Diacetate
Chelating agent
Low-hazard ingredient.Read moreShow less
EWG 1 Chelating agent
Pentylene Glycol
Skin conditioning, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSolvent
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
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
PEG/PPG-18/18 Dimethicone
Emulsifying
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Emulsifying
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
Butylene Glycol
Fragrance, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSkin conditioningSolventViscositydecreasing agentHumectantMaskingViscosity controlling Good for Dry Skin
Tocopheryl Acetate
Antioxidant, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 3 AntioxidantSkin conditioning Bad for Oily 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
Linalool
Fragrance, Deodorant
Moderate-hazard ingredient.Read moreShow less
EWG 5 FragranceDeodorantMasking 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.

Sodium Ascorbyl Phosphate, 3-O-ETHYL 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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