Tetrapeptide-30

TET

8/10

Concern level

High concern

Peptide Compound

Synthetic tetrapeptide (PKEK; Pro-Lys-Glu-Lys) used in skincare for skin-conditioning and tone-evening/brightening support, with published cosmetic references describing anti-inflammatory and anti-hyperpigmentation activity. PubChem lists a molecular weight of 500.6 g/mol. ([pubchem.ncbi.nlm.nih.gov](https://pubchem.ncbi.nlm.nih.gov/compound/Tetrapeptide-30?utm_source=openai))

Pore-clogging

Non-comedogenic

Pregnancy

Safe

Regulatory

No data

Benefits

Anti-agingBrighteningHealingSoothing

Chemical Properties

Molecular Weight

500.6 g/mol

pH Range

4.00 - 7.00

Typical Concentration

0.00% - 0.01%

Skin Type Compatibility

dry skin7/10

oily skin7/10

sensitive skin8/10

acne prone7/10

mature skin8/10

normal skin8/10

Interactions

incompatible with: No well-established incompatibilities from the limited public data; in practice, avoid formulating with extreme pH systems or harsh oxidizing conditions that may destabilize peptides. ([inci.guide](https://inci.guide/peptides/tetrapeptide-30?utm_source=openai))

Risks & Warnings

Available cosmetic references do not indicate major toxicity concerns at typical use levels, but peptide data are limited and product-specific safety depends on the final formula. Potential issues are mainly low-likelihood irritation or intolerance in very reactive skin. ([inci.guide](https://inci.guide/peptides/tetrapeptide-30?utm_source=openai))

Vegan Cruelty-Free

Found In Products

EADEM