medik8 Liquid Peptides

Ingredients overview

Label order. Colour is our internal rating: green routine, yellow restricted or worth a look, red prohibited or high-risk, grey not yet decoded.

Ingredients are listed in label order; the order reflects the label only, not exact concentrations.

1. Aqua
2. Glycerin
3. Butylene Glycol
4. Palmitoyl Tetrapeptide-7
5. Palmitoyl Tripeptide-1
6. Copper Heptapeptide-14 Pantothenate
7. Heptapeptide-15 Palmitate
8. Arginine/Lysine Polypeptide
9. Palmitoyl Tripeptide-38
10. Carnosine
11. Acetyl Hexapeptide-8
12. Pentapeptide-18
13. Palmitoyl Tripeptide-5
14. Tetrapeptide-21
15. Sodium Hyaluronate
16. Inulin
17. Alpha-Glucan Oligosaccharide
18. Lactic Acid/Glycolic Acid Copolymer
19. Panthenol
20. Ethylhexylglycerin
21. Hydroxypropyl Cyclodextrin
22. Dunaliella Salina Extract
23. Polysorbate 20
24. Caprylyl Glycol
25. Citric Acid
26. Glyceryl Caprylate
27. Pantolactone
28. Phenylpropanol
29. Polyvinyl Alcohol
30. Carbomer
31. Potassium Sorbate
32. Sodium Benzoate
33. Sorbic Acid
34. Phenoxyethanol
35. Xanthan Gum

Highlights

Free of alcoholFree of parabensFree of siliconesFree of sulfatesFree of mineral oilFree of essential oilsFree of formaldehyde releasersContains PEGContains EU-26 allergensContains fragrance

Key ingredients

SOLVENT

Aqua

DENATURANT

Glycerin

HUMECTANT

Butylene Glycol

SKIN CONDITIONING - MISCELLANEOUS

Palmitoyl Tetrapeptide-7

SKIN CONDITIONING

Palmitoyl Tripeptide-1Arginine/Lysine PolypeptidePalmitoyl Tripeptide-38Carnosine

Other ingredients

Copper Heptapeptide-14 PantothenateHeptapeptide-15 PalmitateAcetyl Hexapeptide-8Pentapeptide-18Palmitoyl Tripeptide-5Tetrapeptide-21Sodium HyaluronateInulinAlpha-Glucan OligosaccharideLactic Acid/Glycolic Acid CopolymerPanthenolEthylhexylglycerinHydroxypropyl CyclodextrinDunaliella Salina ExtractPolysorbate 20Caprylyl GlycolCitric AcidGlyceryl CaprylatePantolactonePhenylpropanolPolyvinyl AlcoholCarbomerPotassium SorbateSodium BenzoateSorbic AcidPhenoxyethanolXanthan Gum

Skim through

Ingredients explained

Aqua

Solvent, main base; microbial control is critical

Glycerin

Workhorse humectant at 3–10%; tacky at high levels, pair with occlusives

Butylene Glycol

Polyol humectant and solvent at 1–5%; aids solubilization, light feel

Palmitoyl Tetrapeptide-7

Palmitoyl Tetrapeptide-7 boosts collagen; use 0.1–1%, formulate with lipid carriers

Palmitoyl Tripeptide-1

Palmitoyl Tripeptide-1 for repair; requires lipid carrier, unstable in aqueous phase

Copper Heptapeptide-14 Pantothenate

Not decoded yet

Heptapeptide-15 Palmitate

Not decoded yet

Arginine/Lysine Polypeptide

Arginine/Lysine polypeptide for skin conditioning; biologically derived, small molecular weight, high safety profile

Palmitoyl Tripeptide-38

Palmitoyl tripeptide; signaling peptide for collagen and antioxidants; 0.1-1% typical, light-sensitive

Carnosine

Dipeptide skin conditioner with antioxidant and buffering properties; used in synergy with other actives.

Acetyl Hexapeptide-8

Acetyl hexapeptide-8; signal peptide, low concentration, used for firming and hydration, low irritancy.

Pentapeptide-18

Peptide for skincare; added at low levels, check supplier data for stability.

Palmitoyl Tripeptide-5

Peptide actives for skin conditioning; typically used at low levels.

Tetrapeptide-21

Tetrapeptide-21 often used for regeneration; requires temperature/light control and careful acid compatibility.

Sodium Hyaluronate

Potent humectant at 0.1–2%; different MW for penetration depth, high levels may draw moisture

Inulin

Plant fiber/prebiotic for moisturizing; fully dissolve to avoid crystallization

Alpha-Glucan Oligosaccharide

Prebiotic for microflora and smoothing; use 0.5-5%, suitable for sensitive skin

Lactic Acid/Glycolic Acid Copolymer

AHA copolymer; exfoliating, requires buffering agents.

Panthenol

Panthenol (vitamin B5) at 1–5%; moisturizing and reparative, supports barrier recovery

Ethylhexylglycerin

Mild conditioner and preservative booster at 0.5–1%; reduces preservative load, smooth feel

Hydroxypropyl Cyclodextrin

Cyclodextrin to complex fragrances/actives; boosts solubility and stability.

Dunaliella Salina Extract

Microalgal extract used as a skin conditioning agent for soothing and barrier support; no public irritancy or comedogenic data.

Polysorbate 20

Non-ionic emulsifier and cleansing surfactant; contains PEG, control microbial load.

Caprylyl Glycol

Polyol conditioner and preservative booster at 0.5–3%; emollient feel, often paired with 1,2-hexanediol

Citric Acid

Buffer and chelator at 0.1–2%; adjusts pH, may irritate sensitive skin at low pH

Glyceryl Caprylate

Mild emulsifier/deodorant at 0.5-2%; polyol ester, high humectancy, low irritancy, check cationic surfactant compatibility.

Pantolactone

Pantolactone, humectant; hydrolyzes to release panthenol, improves skin hydration, low level use, high safety

Phenylpropanol

Phenylpropanol for fragrance and solvent; allergen risk, requires assessment

Polyvinyl Alcohol

Film/viscosity agent for masks/cleansers; water-soluble, forms flexible film

Carbomer

Gelling thickener requiring neutralization; watch out for ion compatibility

Potassium Sorbate

Preservative effective below pH 6; combinable with sodium benzoate

Sodium Benzoate

Preservative booster, effective below pH 4.5; combinable with sorbates

Sorbic Acid

Preservative effective at low pH, often combined with sorbate salts; check regulatory limits

Phenoxyethanol

Broad-spectrum preservative at ≤1%; may irritate sensitive eye areas, often paired with ethylhexylglycerin

Xanthan Gum

Natural thickener at 0.1–1%; provides gel texture, pH-stable, requires full hydration

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