COSRX
The 6 Peptide Skin Booster Serum
The 6 Peptide Skin Booster Serum is a toner from COSRX. Its official ingredient list includes Glycerin and Niacinamide. The brand lists 44 ingredients in this formula; each is explained below with its documented cosmetic functions.
- Routine step
- Tone
- Formula
- 44 listed ingredients
- Source version
- Global brand store
- Formula checked
- 7 October 2026
Inside the formula
A few ingredients worth getting to know, and the roles they play.
Ingredient roles do not establish how well the finished product works. Open a card for its explanation and sources.
Ingredients, decoded
The ingredient list below comes from the brand's formula listing. Open an explanation to see the evidence and things to keep in mind.
| On the label | What it does | The plain-English take |
|---|---|---|
| Water | Fragrance supportDissolving ingredients | Supports the perfume or flavour mixture in a formula. Helps other ingredients dissolve in the formula. |
| Dipropylene Glycol | Fragrance supportDissolving ingredientsTexture | Supports the perfume or flavour mixture in a formula. Helps other ingredients dissolve in the formula. |
| Glycerin | Moisture bindingSkin conditioningFragrance supportDissolving ingredientsTexture | |
| Pentylene Glycol | Skin conditioningFragrance supportDissolving ingredients | Used to help keep skin in good condition. Supports the perfume or flavour mixture in a formula. |
| 1,2-Hexanediol | Skin conditioningFragrance supportDissolving ingredients | Used to help keep skin in good condition. Supports the perfume or flavour mixture in a formula. |
| Niacinamide | Smoothing | |
| Acetyl Hexapeptide-8 | Moisture bindingSkin conditioning | Attracts and holds water. Used to help keep skin in good condition. |
| Copper Tripeptide-1 | Skin conditioning | Used to help keep skin in good condition. |
| sh-Polypeptide-121 | Film formingSkin conditioning | Leaves a thin film on a surface after application. Used to help keep skin in good condition. |
| Dipeptide Diaminobutyroyl Benzylamide Diacetate | Skin conditioning | Used to help keep skin in good condition. |
| Oligopeptide-68 | Lightening | Used to lighten the shade of skin or hair. |
| Palmitoyl Tripeptide-8 | Skin conditioning | Used to help keep skin in good condition. |
| Allantoin | ComfortSkin conditioningSkin protection | Helps ease discomfort on skin or the scalp. Used to help keep skin in good condition. |
| Sodium Hyaluronate | Moisture bindingSkin conditioning | |
| Acetyl Glucosamine | Skin conditioning | Used to help keep skin in good condition. |
| Serine | ScentSkin conditioning | Adds or changes the product's scent. Used to help keep skin in good condition. |
| Alanine | ScentSkin conditioning | Adds or changes the product's scent. Used to help keep skin in good condition. |
| Glycine | pH controlSkin conditioning | Helps keep the formula's acidity at the intended level. Used to help keep skin in good condition. |
| Threonine | Hair shaping | Changes the shape of hair for waving or straightening. |
| Arginine | Skin conditioningScent | Used to help keep skin in good condition. Adds or changes the product's scent. |
| Proline | Skin conditioning | Used to help keep skin in good condition. |
| Betaine | Moisture bindingSkin conditioningTexture | Attracts and holds water. Used to help keep skin in good condition. |
| Sodium PCA | Moisture bindingSkin conditioning | Attracts and holds water. Used to help keep skin in good condition. |
| Sodium Lactate | pH controlMoisture bindingSurface exfoliation | Helps keep the formula's acidity at the intended level. Attracts and holds water. |
| PCA | Moisture bindingMoisture support | Attracts and holds water. Helps support the skin's water content. |
| Glutamic Acid | Moisture binding | Attracts and holds water. |
| Lysine HCl | Skin conditioning | Used to help keep skin in good condition. |
| Tocopherol | Skin conditioningAntioxidantFragrance support | Used to help keep skin in good condition. Slows reactions involving oxygen, helping protect against oxidation. |
| Dextran | BindingTexture | Helps ingredients hold together. Adjusts how thick or fluid the formula is. |
| Glycine Soja (Soybean) Oil | SofteningSkin conditioningScent | Helps soften and smooth the skin. Used to help keep skin in good condition. |
| Hydrogenated Lecithin | Mixing oil and waterSkin conditioning | Helps oil and water combine in a formula. Used to help keep skin in good condition. |
| Ammonium Acryloyldimethyltaurate/VP Copolymer | Texture | Adjusts how thick or fluid the formula is. |
| Polyacrylate Crosspolymer-6 | Formula stabilityTexture | Helps an emulsion stay mixed. Adjusts how thick or fluid the formula is. |
| Butylene Glycol | Moisture bindingSkin conditioningFragrance supportDissolving ingredientsTexture | |
| Xanthan Gum | Mixing oil and waterSkin conditioningBindingFormula stabilityFragrance supportGel textureTexture | Helps oil and water combine in a formula. Used to help keep skin in good condition. |
| Ethylhexylglycerin | Skin conditioningOdour controlFragrance support | Used to help keep skin in good condition. Helps reduce or cover unwanted odour. |
| Adenosine | Skin conditioning | Used to help keep skin in good condition. |
| Polyquaternium-51 | Film formingSkin conditioning | Leaves a thin film on a surface after application. Used to help keep skin in good condition. |
| Disodium EDTA | Formula stabilityFragrance supportTexture | Binds metal ions that can interfere with the formula. Supports the perfume or flavour mixture in a formula. |
| Citric Acid | pH controlFormula stabilityFragrance support | Helps keep the formula's acidity at the intended level. Binds metal ions that can interfere with the formula. |
| Caprylyl Glycol | SofteningSkin conditioningOdour controlFragrance support | Helps soften and smooth the skin. Used to help keep skin in good condition. |
| t-Butyl Alcohol | Alcohol denaturingScentDissolving ingredients | Makes an alcohol-containing formula unsuitable for drinking. Adds or changes the product's scent. |
| Potassium Sorbate | Fragrance supportProduct preservation | Supports the perfume or flavour mixture in a formula. Helps stop microorganisms from spoiling the product. |
| Sodium Oleate | CleansingMixing oil and waterTexture | Helps remove dirt and residue from the skin. Helps oil and water combine in a formula. |
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Sources
- COSRX: The 6 Peptide Skin Booster SerumChecked 2026-10-07T13:14:00.404931+00:00