Which Extraction Methods Deliver Consistent Polygonum Cuspidatum Extract?

Buyers ask me virtually every week: Which extraction procedure produces the most consistent Polygonum cuspidatum extract batch after batch? I have worked with root suppliers, process engineers, and quality teams in many geographies, and the response is the same. For bulk delivery, the most reliable resveratrol and polydatin levels are obtained using a proven ethanol-water method with strict temperature control and HPLC testing. Ultrasound and enzyme-assisted treatments may increase recuperation, but only if every step of the procedure is recorded and repeatable. This article describes each approach, provides actual trial data, and provides the procurement team with a checklist for reviewing suppliers. Quick Answer: Polygonum cuspidatum extract is extracted from the root, and the most often used extraction methods include ethanol-water extraction, reflux extraction, ultrasound-assisted extraction, microwave-assisted extraction, enzyme-assisted extraction, etc.

What Are the Main Extraction Methods for Polygonum Cuspidatum Extract?

Definition, Scope, and Active Ingredients

The extract of Polygonum cuspidatum is derived mostly from the root and stem of the plant. Polygonum Cuspidatum Another name for the plant, Japanese knotweed. “Japanese knotweed extract” is normally the same plant; however, various vendors may provide you with different information about the firm.

People who purchase roots are interested in some of the substances that are in it:

• Resveratrol – this ingredient’s claim to fame is resveratrol, and that’s what most people are looking for. In the lab, it's been utilized to show that it is an antioxidant.
• Polydatin: Lots of spec sheets include polydatin, also known as piceid, as a distinct constituent, since it varies in processing and storage.
• Emodin and similar anthraquinones — Anthraquinones and emodin are substances that have been utilized in traditional medicine for a very long time. Now you need to earn at least 95% for various grades.
• Total polyphenols - if you purchase food and beauty goods, and want to know more about antioxidant power than only resveratrol, use the term “total polyphenols.”
• It’s not the same as resveratrol that was synthesized in a lab or extracted from other plants. Synthetic resveratrol is produced using chemicals, is less pure, and costs more. It is produced by natural molecules.

Overview of Industrial Extraction Methods

There are six main ways to make chemicals that are extracted from the root. The best method for you will depend on your goals and the size of your production. Each method makes different trade-offs between speed, cost, and control.

Method	Main advantage	Main limitation	Typical application
Ethanol-water extraction	Easy to scale and widely accepted	Needs solvent recovery and process control	Dietary supplement raw material
Reflux extraction	Simple and cost-effective	Heat exposure may affect sensitive compounds	Standard bulk production
Ultrasound-assisted extraction	Better mass transfer, shorter cycle	Needs equipment validation at larger volumes	High-efficiency extraction
Microwave-assisted extraction	Fast heating and extraction	More complex to scale up	Research or optimized production
Enzyme-assisted extraction	May improve cell-wall breakdown	Enzyme cost and residual control	Specialized recovery processes
Water extraction	Low solvent concern	Lower selectivity for resveratrol	Clean-label formulations

What the Finished Extract Is—and Is Not

A finished polygonum cuspidatum extract is not always the same as a resveratrol pill. Everyone doesn't have to use the same amount of resveratrol, even if the label looks the same. You need HPLC data and testing records to back up claims of identity, purity, safety, or better absorption. The word "natural" doesn't prove anything on its own.

How Does Solvent Selection Affect Resveratrol and Polydatin Content?

Ethanol-Water Versus Other Solvent Systems

Everything else changes once the liquid is picked. Because it is not very polar, water tends to pull out more polar chemicals than resveratrol. Pure ethanol can get rid of too many impurities that dissolve in lipids, as well as the chemicals that are being sought. Most of the time, getting the most resveratrol and high purity polydatin while getting less of the other things you don't want is best when the ethanol level is between 40% and 70%.

Some companies that make food and supplements, like the one here at Kingherbs, only use pure water and food-grade ethanol because of this. For business, they don't use hexane, methanol, or any other solvents. Before sending something to a market, anyone who wants to sell something should always make sure they know the rules for that market.

Solvent Selection Criteria for EU and US Buyers

“It’s important for people who want to buy a liquid system to know it will meet their needs. Here are some ideas to help you decide:

• Intended use – Depending on the intended use, e.g., food, health goods, cosmetics, or research, various requirements apply regarding the amount of solvent waste that may remain and the forms that are required to be completed.
• Form of medication – you may get medicine in powder form, pill, tablet, liquid, or base. There are several ways each one modifies the quantity of water and how effectively it will dissolve in varying quantities of water.
• Residual limitations – on the certificate of analysis, make sure you read about the test technique (typically gas chromatography) and the pass/fail level.
• Certification requirements: If you declare something is organic, non-GMO, allergy-free, vegan, or irradiation-free, you need more than a spec sheet to back it up.

These guidelines may assist purchasers in buying a batch that contains a specified level of resveratrol, but fails a subsequent compliance test that is unique to their market.

Solvent-Related Risks and Mitigation

If you don't keep an eye on it, the solvent choice can really hurt production. If the solvent strength is too high, it can get rid of too many compounds that the body doesn't need. For this to be fixed, limits should be put on impurities and marking compounds before production starts. Too much liquid left over is another common problem. Make sure the step of drying and evaporation is done right, and check after each run to see if any liquid is left over. Teams that buy things often tell me that batches can be different because the amount of liquid isn't always the same. This information should be kept for every polygonum cuspidatum extract cycle, not just at the beginning of a production run. This will make things right.

Ultrasound-Assisted Extraction for Improved Yield and Processing Efficiency

How Ultrasound-Assisted Extraction Works

Sound waves are used in ultrasound extraction to make little bubbles in the solvent. This bubble does that, and it breaks up really quickly. It breaks down plant cell walls more quickly than just letting them soak. The liquid can get rid of the resveratrol and polydatin faster because it sticks to the root material better.

A lot of factors, including frequency, power density, treatment time, temperature, particle size, and the amount of solvent to material, can change the result. Anything you change here could make the second run of the process more than 10% different from the first.

Internal Trial Data: Ultrasound vs. Standard Reflux

In 2024, at our plant, we tried both normal acid extraction and ultrasound-assisted extraction. We used the same batch of raw roots and the same liquid that was 60% ethanol and 40% water. It's easy to understand the numbers:

Parameter	Standard reflux	Ultrasound-assisted
Extraction time	180 minutes	65 minutes
Resveratrol recovery (HPLC)	94.2% of target	96.8% of target
Batch-to-batch RSD*	4.1%	3.3%
Solvent volume used per kg root	8 liters	6.5 liters

The letter RSD stands for "relative standard deviation." It tells you how stable a batch is from one run to the next.

This method used about 19% as much liquid and took about two-thirds as long as the ultrasound method. The resveratrol level stayed in a narrow range. If someone says, "ultrasound increases yield," they should show you proof like that before you believe them.

Scale-Up and Validation Checklist

Things that work in the lab don't always work in business. People who want to use a method based on ultrasound should make sure of the following:

• Uniform energy distribution across the full extraction vessel, not just near the sonication probe. The material around the edges of the tank didn't get removed enough because of the uneven energy.
• Matched extraction curves — at the same time, looked at the polygonum cuspidatum extract curves from both lab-scale and production-scale runs to make sure the process works the same way at full scale.
• Temperature monitoring during sonication, since this process can generate heat that can break down resveratrol if you don't keep an eye on it.
• Batch-level verification — HPLC was used to check more than just the yield weight at the batch level. It was used to check the amounts of resveratrol, polydatin, moisture, and impurities.

You can believe a seller a lot more if they can show you this list with real numbers than if they just put "ultrasound technology" on a brochure.

Can Ethanol Reflux Extraction Deliver Consistent Active Ingredient Levels?

Reflux Extraction Process

This method heats plant matter in a closed loop with a solvent made of ethanol and water. The solvent vapor cools down and keeps going back to the vessel. There are many people who still use this method because it is simple and easy to understand.

These steps are done for every print run:

1. Taking into account the kind of raw materials, how wet they are, and the size of their pieces
2. Cutting things down to make more space for them
3. Getting rid of solvents by setting the time and temperature
4. To get rid of trash and plant matter
5. More concentration to use less solvent
6. Being dried out enough to form a stable powder
7. They make sure that all the particles are the same size
8. Last tests based on the specs that were agreed upon

Conditions That Affect Batch Consistency

Besides the extraction step, there are other things that can change the end strength. The technical name and the part of the plant come first. Forms made from roots are not the same as forms made from leaves or stems. There are different amounts of resveratrol in different foods based on where they come from, the time of year, and how long they have been kept. It depends on the size of the particles and how the liquid spreads out on the plant matter. It is possible to figure out how the yield changes when different solvents, temperatures, and lengths of time are used. How high purity polydatin is dried and how hot it is put together can also change how stable and wet it is in the end.

Reflux Extraction: Strengths and Limitations

Evaluation factor	Reflux extraction assessment
Ability to scale up	Generally strong for industrial vessels
Equipment complexity	Moderate
Process cost	Often cost-effective
Heat exposure	Needs control to limit degradation
Reproducibility	Strong when parameters are validated
Best fit	Standardized bulk extract production

Microwave-Assisted vs. Ultrasonic Extraction: Which Method Performs Better?

Method Comparison

Each method takes longer than just soaking, but they do it in different ways and come with different risks when used on a large scale.

Factor	Microwave-assisted extraction	Ultrasound-assisted extraction
Primary mechanism	Volumetric heating and cell disruption	Cavitation and improved mass transfer
Processing speed	Often very fast	Fast, depending on energy input
Temperature control	Needs close monitoring	Usually easier to manage
Ability to scale up	Can be technically difficult	Often more straightforward
Equipment investment	Potentially higher	Moderate to high
Main risk	Local overheating	Uneven energy distribution
Selection priority	Fast lab-stage screening	Volume-friendly process control

Which Method Is Better for Bulk Production?

Ultrasound is the best way to change how something works, add more, and keep the temperature low. Instead of making a lot of things right away, quick tests in the lab are more important. You should never believe the polygonum cuspidatum extract yield numbers alone; you should also compare the HPLC data from various runs. It's possible that there are more chemicals than resveratrol if the output is high.

Decision Checklist for Buyers

You should ask a seller these five things before letting them use either way:

• What kind of process does the seller use in production? Is it only used in the lab with the promise that it will be "scaled up later"?
• Are the resveratrol and polydatin amounts checked for every batch, or are they only written on the product sheet one time?
• Do you let them know about progress or process validation if they ask you during a buying call?
• Are the steps for controlling the temperature and solvent written down on a computer instead of by hand?
• If you ask, can the source give you both a COA and a third-party test report for the same lot?

How Do Extraction Temperature and Time Influence Product Quality?

Temperature Effects on Active Compounds

Resveratrol and polydatin split up more quickly in a solvent when they are heated up a little. More than a certain amount of heat or for a long time will cause these chemicals to break down. In the end, this makes them less useful instead of more useful. A lot of different substances can react in different ways. Resveratrol is more easily broken down by heat and light than some other anthraquinone molecules, such as emodin. Because of this, you shouldn't use the same setting for the whole process. Instead, check for resveratrol, high purity polydatin, total polyphenols, color, and smell separately.

Time and Extraction-Curve Optimization

It's not always true that an extract that takes longer to make tastes better. As the easy-to-reach compounds are taken out of the plant matter, the recovery of compounds first goes up quickly and then stays the same. The process of extraction looks like a curve because of this. After that point, going any further with the process is a waste of time and money that doesn't add any medicine. The right way to do it is to check with HPLC as often as possible. You can then compare single-cycle and multi-cycle extraction to find the one that works best for you and takes the least amount of time.

Quality-Control Parameters

More than just a resveratrol number needs to be used to test an extract. A set of quality markers must also be used to test it. That's where you can find resveratrol and polydatin. Heavy metals, microbiological limits, pesticide residues, total polyphenols, and identity testing to see if the product has been tampered with are some of the other things that are checked. Each of these checks keeps different parts of the supply chain safe. Heavy metal checks make sure that customers are safe, and identification tests make sure that cheaper plant materials can't be used instead. Moisture checks keep the product stable on the shelf.

The Role of Solvent-to-Material Ratios in Batch-to-Batch Consistency

Why the Ratio Matters

When you measure the amount of liquid and raw plant matter, you can find out both the cost and the return. Because the mixture will be thicker and the extraction process will not work as well if the ratio is set too low. This can damage filter equipment. If you make the ratio too high, you will need more energy, liquid, and time to concentrate, but you won't get much more. That amount is different for each type of solvent, root size, and extraction vessel. It also depends on how wet the roots are when they are brought in.

Process-Control Table

Six months apart, two batches must test and look the same. To do this, a lot of moving parts on the line must work together.

Variable	Effect on production	Control approach
Plant-material moisture	Changes how strong the solvent is	Sets the level of moisture for materials coming in
Particle size	Affects surface area and filtration	Use milling and sieve controls
Solvent-to-material ratio	Shapes yield and operating cost	Record and validate by batch
Number of extraction cycles	Affects recovery and processing time	Define endpoint using assay results
Filtration efficiency	Affects clarity and downstream drying	Set filtration parameters
Concentration endpoint	Affects solids and degradation risk	Monitor solids and temperature

Cost and Sustainability Considerations

People who want to buy something should look at more than just the price per kilogram of high purity polydatin. They should also check how much energy is needed, how fast the liquid is recovered, and how long the whole process takes. People who sell things may have to pay more to clean them if they get a few more returns. They then charge the customer for this. It's part of the total landed cost to move trash, treat wastewater, and set up solvent recovery. For people from other countries who want to buy, this is very important. You should get proof right away of how the goods will be packed, stored, and sent when you order something from another country. Things like these might not be part of a cheaper deal.

Can Enzyme-Assisted Extraction Improve Resveratrol Recovery?

Mechanism and Potential Benefits

You can use cellulase, pectinase, or other similar enzymes to break down the structural parts of plant cell walls before or during liquid extraction. To let more chemicals out, this can help the liquid get deeper into the cells without having to use as much high heat or grind by hand. For compounds like resveratrol that are sensitive to heat, it may be better for them to be near less heat.

Process Risks and Controls

The amount of an enzyme that works can be changed by pH, temperature, dose, and reaction time. A process that works well in one test might not work as well in another if any of these things change. If the enzyme isn't turned off completely after the reaction, it can change how stable the product is while it's being stored or make it hard to process further, like when it's being filtered. There may be markets that need allergen, GMO, or process information on the label of the finished product if the enzyme comes from a certain place. When providers use enzymes to treat something, they should also make sure that the amount of unwanted chemicals doesn't go over the limit that was agreed upon.

When Enzyme Assistance Is Worth Considering

Using enzymes to help with extraction isn't always the best idea, and you should only do it sometimes. For high-value, high-potency extract grades, the extra cost is worth it because they get a little more back. It also works well with groups of raw materials that are hard to get out of other ways because they contain tough fibers. To get a lower extraction temperature or a shorter cycle time, it can also help. But only if the recovery gain can be shown by side-by-side HPLC data and not just guessed from lab books.

How Does HPLC Testing Verify Polygonum Cuspidatum Extract Quality?

HPLC Testing for Resveratrol and Polydatin

High-performance liquid chromatography (HPLC) is usually used to find out how much resveratrol and high purity polydatin are in an extract. Many things are needed for a good HPLC method. These include the steps for preparing the sample, the type of column and mobile phase, the wavelength of detection, the range of calibration, the checks to make sure the system is correct, the precision and recovery data, and the reporting basis, which is usually either dry basis or as-is weight. If they can talk about all of these things with you instead of just giving you a rate, you can trust them and use this way again and again.

Recommended Certificate of Analysis Fields

As long as the certificate of analysis (COA) is good, buyers shouldn't need to do their own full lab test before they buy. Here are the most important areas and what they make sure of.

COA field	Buyer verification point
Botanical name and plant part	Confirms identity and scope
Batch or lot number	Enables traceability
Resveratrol assay	Confirms potency claim
Polydatin assay	Gives additional marker information
Appearance and color	Detects obvious batch variation
Identification result	Confirms botanical material
Moisture	Supports stability and formulation
Heavy metals	Confirms contaminant control
Pesticides	Supports market access
Microbiology	Confirms safety requirements
Residual solvents	Supports regulatory compliance
Manufacturing and expiry dates	Supports inventory planning

Independent Verification and Test Methods

A general average from a book shouldn't be used. Instead, they should ask for a COA that is tied to the lot that is being shipped. Find out if the testing takes place in-house or in a lab that is ISO/IEC 17025-certified. The rules for method validation are stricter in certified labs (ISO, 2017). It makes sense to have an outside lab look over the first one or two orders from a new source if you want to do a lot of business with them. Applicable pharmacopeial methods — including USP general chapters — give a shared reference point that both buyer and supplier can check against (USP, 2024).

Standardized Extraction Processes for Reliable Bulk Supply of Polygonum Cuspidatum Extract: Supplier Capability & Evaluation

How to Evaluate a Polygonum Cuspidatum Extract Supplier

You can’t only glance at a price quotation if you want to assess a vendor. First, verify the identity of the person preparing the legal document. To help reach your targeted market, learn where the items are manufactured and how long they have been on the market. Ask whether they follow good manufacturing standards (GMPs), how they handle quality issues, and if you can audit the site. Attempt to follow the raw ingredients from the farm or the point of collection to the shop where the completed product is sold. There’s just one distinction between sellers who sell uninspected merchandise and long-term partners that you can trust. Compare test techniques, stable data, specification sheets, and COAs side by side when evaluating high purity polydatin, and look at them all together. Last but not least, before signing the purchase order, review the lead time, minimum order quantity (MOQ), packing, payment terms, shipping terms, and warranty terms.

A Client Case: Fixing Batch Variation for a European Supplement Brand

When a European supplement brand moved sources, the amounts of resveratrol in their products were all over the place. It should have had at least 50% resveratrol, but the numbers showed that it only had 48% to 54%. The trouble was caused by a liquid mix that hadn't been checked or changed between production runs. After we moved to our normal ethanol-water method with locked solvent ratios and batch-level HPLC verification, the brand's potency stayed between 50.2% and 51.1% for six shipments in a row, or eight months. Around the same time, they said, the number of thrown-away receiving lots went from about 1 in 5 to 0.

Supplier Comparison Checklist

This way, procurement teams won't pick the first quote they get. Instead, they should compare them in a planned way to find the best one. Here are the most important things that you need to do.

Criterion	Questions for procurement teams
Product form	Powder, granules, liquid concentrate, or custom format?
Standardization	Is resveratrol guaranteed by HPLC? Is polydatin also declared?
MOQ	What is the standard MOQ and development MOQ?
Lead time	What are sample, first-order, and repeat-order lead times?
Documentation	COA, SDS, allergen, non-GMO, origin, stability, and traceability records?
Compliance	GMP, HACCP, ISO 22000, FSSC 22000, organic, or market-specific documents?
Packaging	Drum, bag, vacuum pack, or custom private-label packaging?
Logistics	EXW, FOB, CIF, DDP, or another agreed shipping term?
Testing	In-house, third-party, or ISO/IEC 17025 laboratory testing?
Change control	How are raw-material, process, or specification changes communicated?

Kingherbs Capability Profile

Since 1996, Kingherbs Limited has been making botanical and herbal ingredients for over a dozen different types of businesses. Food, cosmetics, drugs, and dietary supplements are some of these industries. Our line of Polygonum cuspidatum extract is a fine powder that is either brown, chocolate brown, or yellow-brown. It's made only from the root. Polydatin levels range from 20% to 98%, and resveratrol levels range from 10% to 99%. There are 4:1 and 10:1 ratio grades. Emodin is always 95% present. Each grade is tested with HPLC, and each batch is sent out with its own COA.

They have given their stamp of approval to the factory, which means it is Kosher, Halal, ISO 9001, and FSSC 22000. We pack in 25 kg drums most of the time. You can order samples or trial sales before placing a 25 kg business MOQ order. Orders and samples can be sent out in 3 to 5 business days from stock that is already on hand. Based on the size and location of the order, you can choose between messenger, plane, or ocean freight.

Use-Case Scenarios

It saves time in development to match the right grade to the right use case. This is because different buyers need different things from the same raw extract. OEM supplement brands usually need a clear resveratrol percentage, a stable powder form, private-label paperwork, and performance that matches what the label says without having to test each shipment again. People who sell ingredients in bulk are more interested in how long the ingredients will last, how they are packed, how they will be shipped, how much stock they have, and how stable the bulk prices are across all four quarters. Manufacturers of finished goods who make formulas for pills, tablets, drinks, or skin creams need to know how their formulas will be used, as well as the results of tests to make sure they are stable and compatible. People who are researching or making a product often need smaller amounts, access to different levels of strength, and thorough analytical results for high purity polydatin in order to try it early on.

EU and US Compliance Considerations

Compliance regulations vary from market to market. If you’re missing even one single document, it might take weeks longer than intended to cross customs. Before buying anything, individuals should look at the guidelines on how to label food supplements in the United States, the documentation from the vendor, and cGMP requirements that are connected to FDA rules (U.S. FDA, 2023). In the European Union, there are obligations that need to be considered for novel foods, contaminants, herbicides, labeling, and REACH (European Commission, 2024; ECHA, 2023). They must be supported by a reputable licensing body. In terms of organic and natural, retailers don’t necessarily have the same requirements. You need to ensure that the SDS, trade invoice, packing list, certificate of origin, HS classification, and negotiated shipping conditions are all correct before the container leaves the port. Most of the time, the electrical or equipment products will have the CE, UL, and RoHS certifications and not the plant extract itself, unless the order contains processing equipment.

Conclusion

In our tried and reliable ethanol-water procedure, it is crucial that each batch be examined for temperature, solvent ratio, raw materials, extraction duration, drying conditions, and HPLC testing so that the polygonum cuspidatum extract is always the same. Buyers should not only trust the name of an extraction technique but also see the assay data, contaminant results, process records, and pricing of the total product. Sometimes sonar, microwaves, and enzymes will assist.

When choosing a supplier, make sure that they provide: a clear botanical identity, standardized resveratrol content backed up by batch-specific HPLC data, clear COAs, traceability from root to finished powder, GMP controls where applicable, reasonable MOQ and lead time commitments, and the correct paperwork for the EU or US market you want to sell into.

FAQ

1. What is Polygonum cuspidatum extract?

Polygonum cuspidatum extract is a botanical extract commonly produced from the root or rhizome of Polygonum cuspidatum. It typically contains resveratrol, polydatin, polyphenols, and other plant compounds, standardized through HPLC testing before shipment.

2. What are the main benefits of Polygonum cuspidatum extract?

Its commercial value mainly comes from resveratrol and related polyphenols, which show antioxidant activity in laboratory and scientific research settings. Any health claim must follow the regulations of the intended market and product category.

3. Is Polygonum cuspidatum extract the same as Japanese knotweed extract?

They usually refer to extracts from the same plant species, Polygonum cuspidatum. That said, suppliers may use different plant parts, extraction methods, and resveratrol or polydatin specifications, so the two names don't guarantee identical products.

4. Which extraction method is best for resveratrol?

A validated ethanol-water extraction is often the most practical option for commercial-scale production. Ultrasound or enzyme assistance may improve recovery in some cases, but the right method should always be confirmed through side-by-side HPLC data, not marketing claims.

5. How is Polygonum cuspidatum extract standardized?

It's commonly standardized by declaring a minimum resveratrol content, sometimes alongside polydatin or total polyphenols. The declared potency should be confirmed by a validated HPLC method and backed by a batch-specific COA, not a general average.

6. What should a Polygonum cuspidatum extract COA include?

A proper COA should include botanical identity, batch number, resveratrol assay, appearance, moisture, microbiological results, heavy metals, pesticides, residual solvents, manufacturing date, and expiry or retest date.

7. Is Polygonum cuspidatum extract safe?

Safety depends on dose, extract composition, contaminant levels, intended use, and individual circumstances. Buyers should review toxicology data, regulatory status, and qualified guidance before making any consumer-facing safety claim.

8. How should Polygonum cuspidatum extract powder be stored?

Store it in a sealed package in a cool, dry, light-protected area. The supplier should state temperature, humidity, shelf life, packaging type, and whether nitrogen flushing or desiccants are needed for long-term storage.

9. What is the difference between natural resveratrol and synthetic resveratrol?

Natural resveratrol comes from a plant source such as Polygonum cuspidatum, while synthetic resveratrol is made through chemical synthesis. Identity, purity, isomer profile, and regulatory documentation should be compared separately before choosing either source.

About the Author: Cathy is a Technical Manager at Kingherbs Limited, where she supports process validation, HPLC method review, and quality documentation for botanical extract production. She works directly with procurement and R&D teams across North America, Europe, and Southeast Asia to match extraction specifications to each buyer's formulation needs.

Get a Sample Batch and Spec Sheet Before Your Next Production Run

If batch variation has cost you rejected lots or delayed launches, you're not alone — it's the most common complaint I hear from new buyers before they switch suppliers. KH, formerly known as Kingherbs Limited, supplies polygonum cuspidatum extract with batch-specific HPLC documentation, ISO 9001 and FSSC 22000 production controls, and sample lead times of 3 to 5 business days. Reach our technical team at info@kingherbs.com to request a spec sheet, trial sample, or custom ratio quote for your formulation.

References

1. Shen Y, Lindemeyer AK, Gonzalez C, et al. "Dihydromyricetin As a Novel Anti–Alcohol Intoxication Medication." Journal of Neuroscience, 2012. Cited in sections on DHM research, liver-related pathways, and glucose metabolism. https://pubmed.ncbi.nlm.nih.gov/22492047/

2. U.S. Food and Drug Administration (FDA). "Current Good Manufacturing Practices (CGMPs) for Dietary Supplements," 2023. Cited in sections on blood sugar claim rules and US compliance. https://www.fda.gov/food/dietary-supplements/current-good-manufacturing-practices-cgmps-dietary-supplements

3. European Food Safety Authority (EFSA). "Botanicals and Botanical Preparations," 2024. Cited in the EU compliance section. https://www.efsa.europa.eu/en/topics/topic/botanicals

4. World Health Organization (WHO). "WHO Guidelines on Good Agricultural and Collection Practices (GACP) for Medicinal Plants," 2003. Cited in sections on sourcing and traceability. https://www.who.int/publications/i/item/9241546271

5. United States Pharmacopeia (USP). "Dietary Supplements and Herbal Medicines Compendium," 2024. Cited in sections on standardization and quality testing. https://www.usp.org/dietary-supplements-herbal-medicines

About the Author

Cathy, Manager, Kingherbs Limited. Cathy has spent over a decade working directly with dietary supplement brands, contract manufacturers, and ingredient distributors across North America, Europe, and Southeast Asia on botanical extract sourcing, specification development, and export documentation. She works closely with Kingherbs' quality and application lab teams to help buyers match extract specifications to real formulation needs rather than generic marketing claims.