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Phenylethyl Resorcinol

Product Description

Phenylethyl resorcinol is a new whitening and brightening ingredient in skin care products. Phenylethyl resorcinol powder is widely used in whitening,freckle and anti-aging cosmetics.

The chemical name of phenethylresorcinol is 4-(1-phenylethyl)-1,3-benzenediol. It is an effective ingredient with excellent whitening effect. It mainly achieves whitening by inhibiting the activity of tyrosinase. Purpose. Existing studies have shown that phenethyl resorcinol can effectively whiten the skin when the dosage is over 0.5%, and at the same time can effectively resist oxidation and wrinkle. Phenylethyl resorcinol ingredients are suitable for oily skin, pigmented skin, tolerant skin, and wrinkled skin.

FAQ

★What makes Phenylethyl Resorcinol different from other whitening ingredients?

Compared to traditional brightening agents such as arbutin, Phenylethyl Resorcinol offers stronger tyrosinase inhibition and faster visible results at lower concentrations. It is often considered a high-performance alternative for premium skincare formulations where both efficacy and formulation efficiency are critical.

★What is the maximum legal dosage? Is 0.5% the safe limit?

According to the China NMPA and CIR assessment, the maximum safe concentration is 0.5% in both leave-on (creams, serums) and rinse-off (facial cleansers) products. We strictly advise following this limit. While a higher concentration might increase whitening efficacy, it raises safety and compliance risks. Our high-purity grade (≥99%) is optimized to deliver maximum efficacy within this safe threshold.

★What residual solvents or hazardous substances are present? How do you control Hydroquinone?

The main risk by-products in Phenylethyl Resorcinol synthesis are Hydroquinone and Resorcinol. We understand this is a top concern. Our production follows strict GMP standards. We use HPLC to strictly control residual Hydroquinone to below the detection limit of global regulations (EU & China), ensuring your final formula is safe and non-irritating.

★Does this raw material cause color change (pinkish discoloration) in formulations?

Yes, traditional grades are prone to oxidation, turning pink/red when exposed to heat or light. Our specific grade is processed with advanced stabilization technology (high-purity crystallization). It offers excellent compatibility and photostability. Within the recommended pH range (4.0-6.5) and dosage (0.1%-0.5%), it significantly reduces the risk of discoloration compared to standard market alternatives.

★How does your product compare to branded 377 (e.g., SymWhite® 377)?

Chemically, they are identical—both are Phenylethyl Resorcinol. Our competitive advantage lies in cost-effectiveness without compromise: same tyrosinase inhibition mechanism, stricter impurity profile (meeting strict EU/UK standards), and stable supply with no patent restrictions.

★Will it degrade during long sea freight shipping (high temperature)? What is the shelf life?

No. The melting point is 78-82°C (172-180°F) . It remains a stable solid at room temperature. Packaging: double PE bags + aluminum foil bag/fiber drum (light-proof & moisture-proof). Shelf life: 24 months unopened in cool, dry, dark place. Stability data for simulated shipping conditions (40°C / 75% RH) is available upon request.

★Does Phenylethyl Resorcinol comply with EU, US FDA and ASEAN cosmetic regulations?

Fully meets EU Cosmetics Regulation EC 1223/2009, US FDA cosmetic safety standards and ASEAN cosmetic ingredient registration requirements. We provide complete regulatory documents to support worldwide customs clearance and product formula filing.

Tel：+8615309206328

WhatsApp： +8613572414292

E-mail： alexxue@zhenyibio.com

Phone：+86-029-81294858

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FAQs

How does ZHENYIBIO ensure the oxidative stability of whitening actives in water-based formulations?

We have developed a proprietary Anti-oxidation Stabilization System specifically designed for oxidation-prone active ingredients (such as glutathione). By controlling residual heavy metals in the raw materials—the primary catalysts for oxidation—and recommending a complementary chelating agent regimen, we ensure that the ingredients remain free from browning over extended periods within a pH range of 5.0 to 7.0.

Are your botanical brightening extracts compatible with high-concentration electrolytes?

Our plant extracts undergo a multi-stage refining process to remove the majority of inorganic salts and impurities; as a result, they exhibit excellent compatibility within serum formulations containing thickeners or high concentrations of electrolytes, without giving rise to flocculation or phase separation.

What technologies does ZHENYIBIO use to improve the skin penetration of plant-derived actives?

For large-molecule plant-derived active ingredients, we employ Liposomal Encapsulation and Micronization technologies. These techniques significantly reduce particle size, enabling active ingredients—such as Alpha-Arbutin—to more easily penetrate the stratum corneum and reach the areas where melanocytes are concentrated.

Can you provide In-vitro or In-vivo efficacy data for your whitening product line?

Yes. In addition to providing standard TDS documents, we can—upon request—supply data from Tyrosinase Inhibition Tests as well as Human Patch Test reports to support clinical claims regarding the "whitening efficacy" of your finished products.

Do ZHENYIBIO whitening ingredients meet the regulatory requirements of EU and North America?

Fully Compliant. Our products strictly adhere to both EU (Regulation EC No 1223/2009) and US MoCRA standards. A complete Certificate of Analysis (COA) is provided for every batch of raw materials, ensuring that levels of heavy metals, microbial contaminants, and residual solvents remain well below international regulatory limits.

Are your products "Clean Beauty" compliant (Vegan, Non-GMO, Cruelty-Free)?

Yes. As experts in Natural Plant Actives, we pledge that all our ingredients are derived from sustainable plant sources, contain no animal-derived components, involve no animal testing, and are accompanied by comprehensive traceability statements—empowering your brand to enter the clean beauty sector.

How do you guarantee a stable supply of botanical raw materials regardless of seasonal changes?

ZHENYIBIO maintains its own proprietary botanical cultivation bases. Through controlled environments and standardized harvesting processes, we are able to not only guarantee year-round stock availability but also ensure a high degree of consistency in the content of active ingredients—such as Glabridin—across different production batches.

Can ZHENYIBIO develop customized ingredient concentrations for specific brand requirements?

We can provide customized Standardized Extracts tailored to our clients' specific needs. Whether you require high-purity active monomers or blended ingredients in specific ratios, our R&D laboratory is equipped to make precise adjustments to meet your exact formulation requirements.