INCI: Tetrapeptide-30 CAS:1036207-61-0 Peptide sequence:H-Pro-Lys-Glu-Lys-OH(PKEK) Molecular formula:C22H37N5O8 Molecular weight:499.56~500.58 g/mol Appearance:white or off-white lyophilized powder Purity:≥95% or ≥98% tested by HPLC Solubility:water soluble Moisture:≤10% Single impurity:≤3% Stable pH range:4.0~7.5 Recommended dosage in finished cosmetic:powder raw material 0.001~0.01%;peptide solution(1000ppm) 2~10% Packing for powder:1g,10g,50g,100g per bottle