How to identify high-quality Polygonum cuspidatum root extract?

Polygonum cuspidatum root extract, recognized globally as the "champion of natural resveratrol reserves," is highly favored in the fields of cardiovascular health, anti-oxidation, and anti-aging beauty.However, the market is flooded with products of varying quality, ranging from ordinary powders to high-purity standardized extracts, with vastly different values.

一、 Identification based on data from Polygonum cuspidatum extract

Resveratrol content

• Resveratrol is the core functional component of Polygonum cuspidatum root extract.
• Resveratrol content is commonly found in specifications of 50%, 98%, or even higher. When purchasing, it is essential to request a Certificate of Account (COA) from the supplier and confirm that they are using HPLC for detection.
• Beware of traps：Resveratrol content is usually <5% or low-purity extracts are being passed off as high-purity products. Be highly wary of unusually low prices.

Purity and Impurities

• Heavy metal residues：Suppliers are required to provide test reports for lead, cadmium, arsenic, and mercury to ensure that these levels are within safe limits.
• pesticide residues：Ensure that no prohibited or excessive pesticides were used in the cultivation of raw materials.
• Solvent residue：The residues of organic solvents such as ethanol used in the extraction process must comply with relevant regulations.
• Microbial limits：The total bacterial count, mold, yeast and Escherichia coli indicators must meet the standards.

二、physical properties

Note: High-purity resveratrol extract is usually lighter in color. If a product is dark brown and claims high purity, it is questionable.

三、 Production process

Preferred technology：

• Low-temperature extraction and concentration：It can protect heat-sensitive resveratrol from being destroyed to the greatest extent.
• Chromatographic separation and purification technology：This is the key technology for obtaining resveratrol with an ultra-high purity of over 98%, representing the highest level of craftsmanship.

Be wary of the process：

Simple water extraction or crude alcohol extraction cannot yield high-purity products and contains many impurities.

四、 Supplier Qualification

Choosing a reliable supplier is the first line of defense in quality control.

• Quality Management System Certification：Prioritize companies that are certified to ISO9001, HACCP, or cGMP, as this indicates the standardization of their production environment and processes.
• traceability capability：Inquire about the origin of the raw materials; reputable suppliers will have strict control over the planting base of Polygonum cuspidatum.
• Research and development and testing capabilities：Whether a supplier has its own R&D laboratory and advanced testing equipment (such as HPLC) is the foundation for its internal quality control.
• File support：Can you provide complete and standardized COA and TDS reports, and, upon request, heavy metal and pesticide residue reports?

【Our Quality Commitment】

We firmly believe that trust stems from utmost transparency and professionalism. Therefore, we are committed to providing the Polygonum cuspidatum root extract we offer.：

Standardized high content：We offer standardized resveratrol extracts in two strengths: 50% and 98%, with stable content and batch-to-batch consistency.

Advanced technology：Low-temperature extraction combined with chromatographic purification technology is used to maximize the retention of activity and ensure product purity.

Safe and worry-free：Each batch is equipped with a complete third-party testing report to ensure full compliance with heavy metal, pesticide residue and microbial indicators.

Professional support：We are not only your supplier, but also your technical advisor, providing COA, TDS, MSDS, and comprehensive regulatory and application support.

We firmly believe that only collaborations based on data and expertise can withstand the long-term test of the market. Samples and verification are welcome at any time.