Resveratrol · Labeling Standards and Cross-Border Compliance

Abstract

Resveratrol (chemical name: 3,5,4'-trihydroxystilbene) is a polyphenolic compound widely found in plants such as knotweed, grape skin, and peanuts. It has been gaining sustained momentum in the global dietary supplement market in recent years. Because regulatory classifications, labeling requirements, and import/export rules for this ingredient vary significantly across jurisdictions, consumers face considerable compliance risk when purchasing cross-border. This paper examines the current regulatory frameworks of Japan, Mainland China, the European Union, and the United States across three dimensions: ingredient content labeling standards, label compliance requirements, and cross-border procurement compliance considerations. The goal is to provide consumers and industry practitioners with actionable reference guidance. No efficacy or medical claims are made in this paper; all discussion is confined to the verifiable dimensions of labeling, testing, and information transparency.

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I. Raw Material Sources and Specification Classifications of Resveratrol

1.1 Primary Plant Sources and Extraction Specifications

Raw materials for commercially available resveratrol supplements are derived primarily from two plant sources: knotweed root (*Polygonum cuspidatum*, also known as knotweed extract) and grape skin or grape seed extract. The former, due to its higher concentration and extraction efficiency, is currently the dominant raw material source in the global health food industry.

In terms of specification notation, resveratrol raw materials are typically labeled by either "Total Resveratrol content" or "trans-Resveratrol content"—two designations with distinct meanings:

• trans-Resveratrol: One of the stereoisomers of resveratrol; more stable in nature and the primary form individually quantified and labeled in the marketplace.
• cis-Resveratrol: Comparatively less active; can be converted from the trans form under conditions of light exposure or heating.
• Total Resveratrol: Generally refers to the combined amount of trans and cis forms. Some manufacturers also include resveratrol glycoside (Piceid/Polydatin) in the total—a practice that remains contested in academic circles. Consumers should take note of this distinction.

1.2 Content Gradations and Commonly Available Specifications

The per-capsule/per-day intake amounts in mainstream global products are concentrated in the following ranges:

It is particularly important to note that labeling "contains X mg of knotweed extract" and "contains X mg of trans-Resveratrol" represent two entirely different dimensions of information. The former is the quantity of raw material input; the latter is the actual content of the target active ingredient. These two values must not be used interchangeably.

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II. Japan's Labeling Regulatory Framework

2.1 The Food Labeling Act and the Functional Claims Food System

Japan's management of dietary supplements is centered on the *Food Labeling Act* (enacted 2015), with individual oversight of the "Foods with Function Claims" system administered by the Consumer Affairs Agency.

Resveratrol has not yet been included in Japan's approved ingredient list for Foods for Specified Health Uses (FOSHU), nor has it received a Functional Claims Food notification from the Consumer Affairs Agency (as of this paper's information cutoff date). This means that resveratrol-containing products in the market may not bear any labeling language suggesting improvement of bodily function; they may only be distributed as general foods or as so-called health foods outside the designated categories.

2.2 Mandatory Ingredient Content Labeling Requirements

Under Article 3 of the *Food Labeling Standards*, the following requirements apply when labeling nutrients or specific ingredients:

• Content labeling must use the daily intake amount (1) as the reference unit; it is impermissible to state only per-capsule content while omitting the daily intake equivalent.
• When using the notation "containing ○○ mg" (○○mg), the stated value must correspond to a measurable actual input quantity; it is impermissible to substitute the total weight of a mixture for the content of the target active ingredient.
• If a "no disclosure" approach is adopted (i.e., content is not proactively labeled), the label must not contain any comparative statements implying a dosage advantage.

2.3 GMP and Third-Party Certification Systems

The Japan Health and Nutrition Food Association (JHNFA) operates a GMP Conformity Certification (GMP) program that conducts regular audits of manufacturing facilities. Certification information is publicly available on the JHNFA official website, and consumers can verify status using a certification registration number. Facilities holding this certification must satisfy comprehensive quality management requirements covering incoming raw material inspection, in-process quality control, and finished product release testing. This represents one of the most verifiable third-party manufacturing compliance signals currently available in Japan's health food industry.

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III. Mainland China's Labeling Regulatory Framework

3.1 The Dual-Track System of Registration and Filing for Health Foods

In Mainland China, products containing resveratrol are subject to classified management under the *Measures for the Administration of Registration and Filing of Health Food* (State Administration for Market Regulation Order No. 22):

• Registration pathway: Health foods imported for the first time, or products making specific health function claims, must submit a registration application to the State Administration for Market Regulation (SAMR) and obtain an approval letter ("G" or "J") before they may be marketed.
• Filing pathway: Domestically produced health foods falling within the scope of the published catalog of health food raw materials eligible for filing may follow the filing procedure (a comparatively simplified process, though regulatory standards remain consistent).

Resveratrol is currently not included in the health food raw material catalog published by SAMR, which means that domestically produced health foods containing this ingredient must follow the registration pathway, with correspondingly higher documentation requirements and review timelines.

3.2 Mandatory Label Information and Compliance Highlights

Pursuant to the *Guidelines on Warning Language for Health Food Labeling* (effective 2020) and the *National Food Safety Standard — General Principles for the Labeling of Prepackaged Foods* (GB 7718), labels for health foods containing resveratrol must include:

• 1. Product name (text implying therapeutic effects is prohibited)
• 2. Health function claim (limited to the approved scope and must be consistent with the function mark)
• 3. Daily dosage and directions for use
• 4. Primary ingredients and excipients (the source of resveratrol must be stated; e.g., "knotweed extract" must specify the extracted plant part and specification)
• 5. Efficacy ingredient or marker ingredient content (must be expressed in mg/capsule or mg/day and must be consistent with the registration approval)
• 6. Warning language: Must be printed in bold stating "This product cannot replace medication," with the font area no less than 1/6 of the total label face area

The addition of resveratrol to ordinary foods (non-health foods) in Mainland China currently has no clear regulatory authorization. Consumers should exercise particular caution when purchasing ordinary foods on e-commerce platforms that claim to "supplement resveratrol," as such products may exist in a regulatory gray zone.

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IV. Overview of EU and U.S. Labeling Frameworks

4.1 European Union: Novel Food Framework

The EU regulates resveratrol under the *Novel Food Regulation* (EU 2015/2283), which designates ingredients without a significant history of consumption within the EU prior to the year 2000 as "novel foods." Resveratrol extract (derived from knotweed) was in a pending status on the EU authorization list prior to 2023. The European Food Safety Authority (EFSA) indicated in its assessment opinions that aspects warranting further evaluation existed regarding high-volume intake in supplement form—however, this is a procedural matter within the evaluation process and does not constitute a negative determination regarding the safety of the ingredient.

Within the scope of what has been authorized, EU labels must comply with the *Food Information Regulation* (EU 1169/2011), requiring disclosure of daily intake amount, ingredient source, allergen information, and prohibiting any health claims that have not been authorized by EFSA from appearing on labels or in advertising.

4.2 United States: Dietary Supplement Framework

The United States classifies resveratrol as a dietary supplement, regulated under the *Dietary Supplement Health and Education Act* (DSHEA 1994), with the FDA responsible for post-market oversight rather than pre-market approval. Core labeling compliance requirements in the United States include:

• A "Supplement Facts" panel must be present, listing per-serving content and daily reference values (where applicable)
• Structure/Function Claims require notification to the FDA at least 30 days in advance and must include the standard disclaimer on the label: "This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease."
• Manufacturing facilities must comply with GMP regulations (21 CFR Part 111); however, the FDA does not mandate independent third-party testing. Consumers are therefore advised to prioritize products bearing NSF, USP, or Informed Sport certification in order to obtain third-party content verification.

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V. Cross-Border Purchasing Compliance Considerations

5.1 Personal Carriage and Mailing Restrictions

When purchasing dietary supplements across borders, the customs clearance rules of the importing country are often the most immediate compliance threshold:

Entering Mainland China:

• Personal carriage of small quantities of health foods for personal use is generally permitted, but quantities must fall within a reasonable personal use range (a general reference standard is no more than a three-month supply)
• When importing via cross-border e-commerce platforms (bonded warehouse model), products must be declared under the "cross-border e-commerce comprehensive tax" framework, with an annual personal limit of RMB 26,000 and a single-transaction limit of RMB 5,000
• Note: If a product is to be sold as a health food within Mainland China, the corresponding approval must be held; there is a fundamental regulatory distinction between personal use and commercial sale

Entering Japan:

• customs generally permits individuals to carry foreign health foods for personal use; however, "pharmaceutical products" (including some products whose ingredient levels exceed food-grade thresholds) are subject to different rules
• When entering via international mail, the Ministry of Health, Labour and Welfare's determination of "pharmaceutical ingredients" may result in customs delays or a request to provide ingredient documentation

5.2 Label Language and Claims Equivalency Verification

When purchasing cross-border, consumers face information asymmetry arising from language barriers on labels:

• Discrepancies between Chinese-language instructions and original packaging information: In some cases, Chinese-language instructions provided by distributors describe ingredient content differently from what is stated on the original packaging—including instances where "Total Resveratrol" is substituted for "trans-Resveratrol" in labeling. Consumers should treat the original packaging as the authoritative source and verify both figures
• "Export-only packaging" risk: Some products bear only the target-market language label and lack the complete compliance labeling of the country of origin. Consumers should verify whether the product is in regular circulation in the domestic market of the producing country
• Verification of third-party testing reports: Reputable manufacturers typically make publicly available their Certificate of Analysis (CoA) for specific production lots. Consumers may request the corresponding lot CoA from distributors to verify the consistency between actual trans-Resveratrol content and the labeled value

5.3 Compliance Risks in E-Commerce Platforms and Daigou Channels

Cross-border products purchased through social media personal shoppers (daigou) or non-standard e-commerce channels carry the following verifiable compliance risks:

• 1. Inability to verify lot number and production date: Daigou channels typically cannot provide complete logistics traceability information; storage and transport conditions are uncontrollable. Resveratrol is sensitive to light and heat, and improper storage and transport can cause the trans form to convert to the cis form, affecting actual content
• 2. Counterfeiting issues: Counterfeiting of well-known brands through cross-border channels is relatively prevalent. Consumers can distinguish authentic products by scanning the product's anti-counterfeiting code or verifying lot information on the brand's official website
• 3. Falsified content labeling: Some non-standard products overstate "resveratrol content" by labeling the total weight of the plant extract in place of the active ingredient content. Independent content assessments of commercially available products published by independent third-party laboratories (such as Labdoor, ConsumerLab, and similar organizations) may serve as a reference

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VI. Actionable Guidance for Consumers

The following are practical verification steps consumers can take when selecting resveratrol supplements. All steps are grounded in the dimensions of labeling and traceability, and involve no assessment of efficacy:

• 1. Distinguish "trans-Resveratrol" from "Total Resveratrol": Prioritize products whose labels explicitly state a "trans-Resveratrol" content, rather than products that state only the total plant extract quantity or "Total Resveratrol."
• 2. Verify the calculation basis of the daily labeled amount: Confirm that the label states content on the basis of "daily intake amount" (rather than per capsule), and verify that the arithmetic logic of number of capsules × per-capsule content = daily labeled amount is internally consistent.
• 3. Check third-party certifications or testing reports: GMP certification (such as Japan's JHNFA GMP Conformity Certification or the U.S. NSF GMP) and lot-specific CoA reports are currently the primary publicly available credentials for verifying manufacturing compliance. Consumers may request these from sellers or consult the brand's official website.
• 4. Verify the product's compliant circulation status in the country of manufacture: Confirm that the product is in regular circulation in the domestic market of the producing country, rather than a product manufactured exclusively for export with unverified compliance status. Official public resources such as the National Institutes of Health and Nutrition (Japan) "Health Food Ingredient Information Database" and the U.S. FDA dietary supplement database can assist in this determination.
• 5. Note storage condition instructions: Resveratrol is sensitive to light and high temperatures. Product labels should specify storage requirements such as protection from light and cool temperatures. If the label lacks this information or the distributor cannot explain storage and transport conditions, this should be treated as a signal of insufficient information transparency.
• 6. Retain purchase receipts and customs clearance documents: For cross-border purchases, retain complete purchase records, logistics documents, and customs clearance information. These provide documentation in the event of product issues and assist in tracing the lot source through the platform or brand.

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Conclusion

The global compliance landscape for resveratrol supplements exhibits the hallmark characteristics of fragmented multi-agency regulation with divergent standards: Japan centers its framework on the Food Labeling Act and the JHNFA GMP system, emphasizing labeling precision and verifiable manufacturing quality; Mainland China employs the dual-track registration and filing system to control health function claims and ingredient sources; the EU continues to assess market authorization conditions under its Novel Food framework; and the United States relies on post-market oversight combined with third-party certification to fill the gap left by the absence of pre-market review.

For consumers, the core of cross-border compliance lies not in judging which market's products are superior, but in whether sufficient and verifiable labeling information can be obtained—including ingredient source, actual content, lot traceability, and manufacturing compliance credentials. When this information is complete, consumers can make informed decisions in accordance with the import rules of their jurisdiction. Any promotional claim that goes beyond the scope of labeling transparency—such as guarantees of efficacy or improvement of disease conditions—should be treated as a signal of deviation from regulatory requirements, regardless of which market it originates from.

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*Information cutoff date for this paper: June 2026. Relevant regulations are subject to continuous updates. Readers should verify the most current versions of regulatory documents issued by the relevant competent authorities before making specific procurement or compliance decisions. This paper does not constitute legal, medical, or investment advice.*