Drop Care®Pearl  H (hydrolyzed pearl) is a small molecule obtained by hydrolysis of shell hard protein, which has a strong inhibitory effect on tyrosinase.

• Trademark Name: DropCare® QA-73

• INCI Name: Quarternium-73

• CAS number: 15763-48-1

• Appearance: Yellow crystalline powder

• Analysis (HPLC): ≥98%

• Package: 1kg/bag, 25kg/barrel

Quaternium-73, also known as Pionine, is a highly effective antibacterial ingredient commonly used in Japanese over-the-counter (OTC) acne treatment products, such as Kobayashi's Anti-Acne First Aid Stick. It appears as a yellow, odorless, crystalline powder with excellent stability and broad-spectrum antibacterial properties, demonstrating potent efficacy even at low concentrations. Due to its outstanding antibacterial properties, Quaternium-73 is widely used in cosmetics and personal care products to enhance product stability and safety.

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Quaternium-73 is known for its outstanding antibacterial properties, effectively inhibiting acne-causing bacteria such as Propionibacterium acnes, Staphylococcus aureus, and Escherichia coli, helping prevent and alleviate acne. In addition to its antibacterial properties, it also acts as a preservative with superior performance compared to conventional parabens.

Quaternium-73 also inhibits melanin production, resulting in a brighter, more even skin tone. Consequently, it is frequently included in acne treatments, whitening agents, and antiseptic formulations to promote clear, healthy skin.