Coenzyme Q10: Labeling Standards and Cross-Border Compliance

Executive Summary

Coenzyme Q10 (CoQ10; also known as ubiquinone or ubiquinol) is a lipid-soluble compound present throughout the mitochondria of human cells. It has long been a primary active ingredient in the health food markets of Japan, the European Union, North America, and China. Given its multiple chemical forms, wide range of active concentrations, and frequent cross-border trade, questions surrounding ingredient quantity labeling, label compliance, and import/export regulation have attracted growing attention from consumers and industry professionals alike.

This paper systematically examines the regulatory logic and practical verification methods applicable to the major markets, across three dimensions: labeling standards, label compliance frameworks, and cross-border purchasing compliance. It is intended as a reference for informed consumer decision-making and industry best practices. This paper makes no medical claims and contains no descriptions of therapeutic effects. All statements are confined to verifiable dimensions: ingredient content, labeling transparency, testing standards, and regulatory frameworks.

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I. Chemical Forms of CoQ10 and the Foundations of Labeling

1.1 Two Principal Chemical Forms

CoQ10 exists in two forms in commercial products:

• Ubiquinone: The oxidized form. Yellow to orange in color, chemically stable, and the predominant raw material form currently on the market. CAS No. 303-98-0.
• Ubiquinol: The reduced form. More sensitive to light, heat, and oxidation. On -language labels, it typically appears under its common name for the reduced form or as "Ubiquinol." CAS No. 992-78-9.

The two forms differ in molecular weight (ubiquinone: 863.34 g/mol; ubiquinol: 865.36 g/mol). At the labeling level, however, Japan's Food Labeling Standards do not require the two forms to be differentiated — only that the specific ingredient name actually used in the product be accurately stated. Consumers should therefore actively identify which form a product contains when reading a label, as this directly affects their ability to verify raw material sourcing and quality documentation.

1.2 The Labeling Logic for Daily Serving Amount and Net Content

In the market, ingredient content labeling for health foods — spanning general foods, Foods with Function Claims (FFC), and Foods for Specified Health Uses (FOSHU) — follows a daily serving amount (recommended daily intake) framework rather than a per-unit quantity framework. Specifically:

• If a product's recommended serving is two capsules per day and each capsule contains 50 mg of CoQ10, the label should read "100 mg of CoQ10 per recommended daily serving," not the per-capsule amount.
• Likewise, net content must be stated in the legally required units of measurement (g or mg) and must be consistent with the labeling logic used in the ingredient list.

The core value of this labeling approach is that it enables consumers to compare actual intake amounts across products of different unit sizes or total package counts, rather than being misled by per-unit weight or total capsule number alone.

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II. Japan's Domestic Labeling Regulatory Framework

2.1 The Food Labeling Act and Food Labeling Standards

Japan's Food Labeling Act, which came into force in 2015, consolidated food labeling provisions that had previously been dispersed across the Food Sanitation Act, the JAS Act, and the Health Promotion Act into a single unified framework. The accompanying Food Labeling Standards — issued as a Cabinet Office Order by the Consumer Affairs Agency (CAA) — are currently the most important mandatory technical document governing health food labeling in Japan.

For health foods containing CoQ10, the Food Labeling Standards require the following items to appear in their entirety on the final retail packaging:

For CoQ10 products, the five core elements of the Nutrition Facts panel are mandatory. CoQ10 itself may optionally be declared as an "other ingredient." However, if the product is filed as an FFC, CoQ10 must be quantitatively labeled as the functional ingredient, and the corresponding filing must be publicly accessible through the CAA's Foods with Function Claims notification database.

2.2 The Foods with Function Claims System and Label Compliance

Established in 2015, the Foods with Function Claims (FFC) system permits companies to make scientific literature-supported functional statements on labels, provided they have completed a pre-market notification filing with the CAA. As of 2025, dozens of FFC filings covering CoQ10-containing products have been accepted and are publicly searchable in the CAA's official notification database, including:

• Filing reference number
• Name and quantified amount of the functional ingredient
• Abstract of the supporting scientific literature
• Manufacturing facility and quality management information

This means consumers and professional organizations can use a product's filing reference number to verify whether a label claim — for example, "100 mg of CoQ10 per daily serving" — is consistent with the figures in the actual CAA filing, thereby assessing labeling transparency.

Important: Functional statements under the FFC system are strictly restricted. No statement may describe the treatment, prevention, or diagnosis of any disease. Any expression that crosses the line from "maintenance of a bodily function" into disease-related territory constitutes a regulatory violation.

2.3 GMP Certification and Labeling Credibility

The Japan Health and Nutrition Food Association (JHNFA) operates a GMP Compliance Certification program, under which health food manufacturing facilities are subject to periodic inspection and certification, each assigned a verifiable certificate number. GMP certification is not itself a labeling requirement, but as a third-party quality management system certification, it indirectly supports the credibility of label claims: GMP-certified facilities must maintain batch records, ingredient content testing records, and retention samples, all of which provide documentary traceability for the ingredient quantity data stated on labels.

Consumers can verify a specific manufacturing facility's certification status and scope by entering the facility's certificate number (e.g., 34225) into the certified company and facility search function on the JHNFA official website. This allows consumers to confirm whether the manufacturing location and GMP status declared on the product label are accurate.

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III. Comparative Labeling Requirements Across Major International Markets

3.1 United States: Labeling Requirements Under the DSHEA Framework

In the United States, dietary supplements are regulated under the Dietary Supplement Health and Education Act of 1994 (DSHEA), and labeling requirements are governed by FDA 21 CFR Part 101. Core requirements include:

• A Supplement Facts panel must be displayed, listing the serving size and the amount of CoQ10 (in milligrams) per serving.
• The product must be labeled as a "Dietary Supplement."
• If a structure/function claim is made, the label must include the disclaimer: *"This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease."*
• Manufacturers must notify the FDA of any structure/function claims within 30 days of bringing the product to market.

Notably, CoQ10 products under the DSHEA framework do not require pre-market approval. However, manufacturers must comply with the current Good Manufacturing Practice (cGMP) requirements of 21 CFR Part 111, including batch testing to verify ingredient content. This means that a compliant U.S. product label should be backed by batch test reports as supporting documentation.

3.2 European Union: The Food Supplements Directive Framework

The European Union regulates nutrient supplements under Directive 2002/46/EC (the Food Supplements Directive). However, CoQ10 has not yet been included in the EU's harmonized positive list — which currently covers only vitamins and minerals — resulting in divergent regulatory approaches among member states with respect to CoQ10 supplements.

At the labeling level, EU Regulation No 1169/2011 on the provision of food information to consumers requires:

• Labeling in the official language(s) of the member state in which the product is sold
• A stated recommended daily intake
• No claims that the product treats, prevents, or cures human diseases
• A warning not to exceed the recommended daily intake

3.3 China: A Dual-Track System for Registered Health Foods and General Foods

In China, the applicable regulatory framework for CoQ10 products depends on how the product is positioned:

Registered Health Food Pathway: Products must apply to the State Administration for Market Regulation (SAMR) for registration or filing, obtaining the "Blue Hat" certification (the official health food approval number). Labels must include the approval number, any permitted functional claims (limited to the approved scope of functions), precautions, and contraindicated populations. CoQ10 has a well-established history of use in China's registered health food sector, and the Health Food Ingredient Catalog specifies permissible usage levels.

General Food Pathway: If marketed as a general food, no health function claims may be made on the label, and the product must comply with the relevant requirements of China's National Food Safety Standards.

Under the cross-border e-commerce channel, qualifying health food products may enter China via this route in accordance with the Cross-Border E-Commerce Retail Import Commodity List, subject to platform registration requirements and applicable labeling rules.

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IV. Key Compliance Considerations for Cross-Border Purchases

4.1 Label Language and Completeness of Required Information

One of the most common compliance risks in cross-border purchasing is that destination markets require labeling in the local language, while products originating from the country of export carry only - or English-language labels.

• Japan → China: Under China's Measures for the Administration of Import and Export Food Safety and the General Standard for Labeling of Prepackaged Foods (GB 7718), imported foods must bear a -language label. The label must include the product name, ingredient list, net content, date of manufacture and shelf life, storage conditions, importer information, and country of origin, among other required items. Missing or incomplete labeling is one of the most common reasons for customs clearance issues.
• Japan → EU / United States: The product's regulatory category (dietary supplement vs. general food) must be confirmed, and the label must satisfy the applicable classification statement requirements of the destination market.

4.2 Verifiability of Ingredient Content

When making cross-border purchases, consumers are advised to check the availability of the following documentation:

• 1. Third-Party Certificate of Analysis (CoA): Reputable manufacturers should be able to provide a CoA for each production batch, issued by a qualified, independent third-party laboratory (e.g., SGS, Eurofins, or the Japan Food Research Laboratories). The report should specify the testing method (e.g., HPLC — High-Performance Liquid Chromatography), the test result, and the deviation from the labeled value.
• 2. CAA Filing Data (for FFCs): The quantitative ingredient data corresponding to a product's CAA filing reference number can be verified in the CAA's public notification database.
• 3. GMP Certification Status: The certification status of the manufacturing facility can be confirmed through the official websites of certifying bodies such as JHNFA.

4.3 Tariff Classification and Customs Clearance Risks

The customs classification of CoQ10 products in cross-border trade typically involves:

• HS Code 2106.90 (other food preparations) or HS Code 2936 (vitamins and their derivatives — CoQ10 is sometimes classified here due to its chemical structure)
• Different classifications result in different applicable duty rates, regulatory requirements, and inspection and quarantine procedures

Taking Japan-to-China personal cross-border purchases as an example: within the reasonable quantity limits for personal use defined by Customs, health food products generally fall under the postal import duty (parcel tax) policy. When purchased through cross-border e-commerce platforms (whether via bonded warehouse or direct-ship models), the platform must complete the required compliance registration, and products must appear on the cross-border e-commerce positive list.

4.4 Identifying Fraudulent Labeling and Excessive Claims

The following statements on cross-border product labels are common red flags for violations or compliance risks, and consumers should remain vigilant:

• Any claim involving "prevention," "treatment," or "improvement of a disease," regardless of the language in which it appears
• A significant discrepancy between the labeled ingredient content and what is reflected in available test reports (the generally accepted tolerance is ±20%, though the specific standard varies by market)
• Missing manufacturer name, address, or contact information
• Inability to provide proof of raw material origin or provenance documentation
• Missing allergen information (e.g., if the product contains soy-derived ingredients, this must be accurately declared in the ingredient list — CoQ10 raw material is sometimes produced using a soy-based substrate)

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V. Raw Material Traceability and Information Transparency

5.1 Principal Sources of CoQ10 Raw Material

Commercial CoQ10 raw material is produced globally, primarily via microbial fermentation, with Japan and China as the leading producing countries. Raw material from established ingredient suppliers typically comes accompanied by:

• A raw material specification sheet
• A purity test report
• Heavy metal and microbial limit test reports
• A non-GMO declaration (where required)

The minimum standard for information transparency from finished product manufacturers should be the ability to provide, to regulators or consumers upon request, a complete documentary chain traceable to the source raw material batch.

5.2 Special Labeling Considerations for Ubiquinol Raw Material

The reduced form of CoQ10 — ubiquinol — has lower inherent stability and more demanding storage requirements (protection from light, low temperature, inert gas packaging). At the labeling level, if a product claims to use ubiquinol as its raw material, a compliant label should:

• Explicitly state "Ubiquinol" by name rather than the generic term "CoQ10"
• Specify storage conditions consistent with ubiquinol's stability requirements
• Where a CoA is available, confirm that the tested form is ubiquinol rather than ubiquinone, to avoid any confusion between the two chemical forms

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VI. Actionable Guidance for Consumers

The following are practical compliance verification steps consumers can take when purchasing health food products containing CoQ10:

• 1. Confirm the product category and applicable regulatory classification

Check whether the label identifies the product as a Food with Function Claims (FFC), a Food for Specified Health Uses (FOSHU), or a general food. FFCs can be verified in the CAA's public notification database by entering the filing reference number to review ingredient content data and the abstract of the supporting scientific evidence.

• 2. Check the completeness of ingredient labeling

Confirm that the label states the specific chemical form of CoQ10 (ubiquinone or ubiquinol) and the amount in milligrams per recommended daily serving. Avoid purchasing products that state only "contains CoQ10" without specifying a concrete quantity.

• 3. Verify the manufacturing facility's credentials

If the product claims that the manufacturing facility holds JHNFA GMP Compliance Certification, visit the JHNFA website, enter the certificate number, and confirm the facility's certification status, certified scope, and validity period.

• 4. Request or review a third-party Certificate of Analysis

Reputable brands typically make batch CoAs publicly available on their official websites or provide them upon consumer request. Verify that the deviation between the tested CoQ10 content and the labeled value falls within an acceptable range (generally ±20%).

• 5. Confirm -label compliance for cross-border purchases

Imported products purchased through compliant channels should bear a -language label meeting GB 7718 requirements. If a product carries only a foreign-language label with no addendum, it may be a non-compliant product; consumers should exercise caution.

• 6. Watch for out-of-scope claims and non-compliant statements

Any product whose label or accompanying promotional materials contain medical claims such as "improves cardiac function," "lowers blood pressure," or "anticancer" has exceeded the permissible scope of claims for dietary supplements and should be avoided.

• 7. Confirm raw material traceability

Consumers may contact the brand's official website or customer service channel to inquire about raw material supplier information and country of origin. A transparent raw material traceability system is an important quality hallmark of a mature brand and a meaningful indicator of overall labeling credibility.

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Conclusion

Labeling compliance for CoQ10 health food products may appear on the surface to be a technical labeling matter. In substance, however, it reflects a company's overall standards across three areas: ingredient content transparency, manufacturing process traceability, and regulatory awareness. From Japan's Food Labeling Standards to the U.S. DSHEA framework, EU food information regulations, and China's registered health food system, the regulatory logic across major markets differs in its specifics but converges on the same core principles: ingredient content must be documentable, claims must be scientifically supported, and labeling must be accurate and non-misleading.

For consumers, developing a purchasing decision process grounded in verifiable reference points — filing reference numbers, GMP certificate numbers, and third-party Certificates of Analysis — is far more reliable than relying on advertising claims alone. For industry professionals, in an environment of increasingly frequent cross-border trade, proactively enhancing labeling transparency and building a complete documentary traceability system is not only a baseline regulatory requirement but a core competitive advantage in earning long-term consumer trust.

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*The content of this paper is confined to verifiable dimensions including labeling standards, testing standards, and regulatory frameworks. It does not constitute medical advice and contains no descriptions of product efficacy. All regulatory references are subject to the most current official documents issued by the relevant national regulatory authorities.*