Functional ingredient (efficacy component) testing is a mandatory technical element of health food registration and filing applications, demonstrating that a product consistently delivers the marker compounds that support its declared health function claims. This guide explains the regulatory basis, sample requirements, testing scope, analytical methods, and practical considerations for generating compliant test data with accredited third-party laboratories.
Technical Overview
In China, health foods are a legally defined category of foods that claim specific health functions and are recognizable by the blue "health food" logo on the label. Under the Food Safety Law of the People's Republic of China and the administrative measures for health food registration and filing issued by the State Administration for Market Regulation (SAMR), a product must obtain either a registration certificate or a filing number before it may be placed on the market. Among the core elements of the technical dossier, the testing of functional ingredients—often referred to as efficacy or marker component testing—provides the scientific evidence linking the formula to the claimed health function.
Functional ingredient testing involves the qualitative identification and quantitative determination of characteristic compounds derived from the formula's raw materials and directly associated with the declared health function, which must correspond to one of the currently permitted claims in the national catalog of health functions. The resulting data verify formula authenticity, confirm that label declarations are accurate, demonstrate batch-to-batch consistency, and establish acceptance criteria in the product technical requirements that become binding once the certificate is issued.
Testing is performed in accordance with national food safety standards such as GB 16740 for health food, the GB 5009 series for physical-chemical analysis, the GB 4789 series for microbiology, and the Pharmacopoeia of the People's Republic of China where appropriate. Where no national standard method exists for a specific marker compound, a laboratory-developed method must be fully validated and the validation data submitted for regulatory review. All testing for registration purposes must be carried out by laboratories holding the required domestic testing qualification and operating under ISO/IEC 17025-accredited management systems.
Registration applies to products using raw materials or health functions outside the published catalogs, while filing is available primarily for vitamin and mineral nutritional supplements and products based exclusively on catalog-listed raw materials. In both pathways, functional ingredient test data constitute a decisive review focus, and registration certificates remain valid for five years, after which renewal again requires current, compliant testing evidence.
Testing Samples
Sample selection follows the dosage form, the nature of the active raw materials, and the purpose of the study, whether for dossier submission, stability evaluation, or routine quality control. All registration samples must originate from trial-production or production batches manufactured under the commercial process described in the dossier.
Finished Products
- Oral tablets, including regular, chewable, effervescent, and buccal tablets.
- Hard capsules containing powders, granules, or microencapsulated ingredients.
- Soft capsules (softgels) containing oils, oil-soluble vitamins, and lipid extracts.
- Oral liquids, drops, syrups, and concentrated drinks.
- Granules, powders, and solid beverage-type preparations.
- Probiotic powders and live microbial preparations.
- Teas, jellies, pastes, and other permitted conventional food forms.
Raw Materials and Intermediate Products
Botanical extracts, fermentation products, vitamins, minerals, functional sugars, and excipients are tested at intake to confirm identity and assay value before formulation. Intermediate products, such as granulation blends, encapsulated oils, and blending premixes, may be tested during process validation to demonstrate uniformity of the functional ingredient throughout production.
Stability Study Samples
Stability testing is conducted on three batches of finished product in the proposed commercial packaging under accelerated and long-term storage conditions, with functional ingredient content measured at defined intervals through the proposed shelf life. Degradation trends are used to justify the shelf life and to set appropriate overage and lower limits in the product technical requirements.
Registration Submission Samples
For dossier submission, samples are drawn from representative batches using documented sampling procedures, sealed, and transferred under chain-of-custody control to the testing laboratory. Sufficient quantities must be provided to cover the full scope of functional ingredient, hygiene, contaminant, and stability testing, including retain samples for repeat or arbitration analysis.
Testing Items
The testing scope is derived from the formula analysis and must cover every functional or characteristic ingredient that supports the declared health function, together with components used to control the quality of key raw materials. Typical categories include the following.
- Vitamins: fat-soluble vitamins A, D, E, and K, and water-soluble vitamins including B1, B2, B6, B12, C, niacin, folic acid, pantothenic acid, and biotin.
- Minerals and trace elements: calcium, magnesium, iron, zinc, selenium, copper, manganese, potassium, chromium, and molybdenum.
- Amino acids and nitrogen compounds: taurine, L-theanine, arginine, melatonin, and glucosamine.
- Fatty acids and lipids: EPA, DHA, alpha-linolenic acid, linoleic acid, phospholipids, medium-chain triglycerides, and plant sterols and stanols.
- Carbohydrates and polysaccharides: crude polysaccharide, beta-glucan, chondroitin sulfate, hyaluronic acid, inulin, and dietary fiber fractions.
- Flavonoids and phenolic compounds: total flavonoids, anthocyanins, proanthocyanidins, soy isoflavones, rutin, quercetin, and resveratrol.
- Saponins and terpenoids: ginsenosides and rare ginsenosides, astragaloside, puerarin, icariin, and total triterpenes.
- Other characteristic actives: coenzyme Q10, lycopene, lutein, L-carnitine, caffeine, synephrine, and alpha-lipoic acid.
- Probiotics: viable counts of Lactobacillus and Bifidobacterium species and strain-level identity confirmation.
- Authenticity and adulteration screening: chromatographic fingerprint comparison and targeted screening for undeclared pharmacologically active substances.
Functional ingredient testing is submitted alongside the companion safety and quality panel required for a complete dossier, covering microbiological limits, heavy metals and contaminant elements, pesticide residues where botanic materials are used, mycotoxins, solvent residues, and dosage-form performance tests such as disintegration.
Testing Methods
Chromatographic Techniques
High-performance liquid chromatography with diode-array, fluorescence, or electrochemical detection is the workhorse method for vitamins, glycosides, flavonoids, alkaloids, carotenoids, and coenzyme Q10. Ultra-high-performance liquid chromatography coupled with tandem mass spectrometry provides the sensitivity and selectivity needed for trace-level compounds, multicomponent profiling, and confirmatory identification of marker compounds in complex matrices. Gas chromatography with flame ionization detection or mass spectrometric detection is applied to fatty acid profiles following derivatization to methyl esters, in line with the relevant GB 5009 fatty acid methods, and to residual solvent analysis.
Spectroscopic and Elemental Techniques
Ultraviolet-visible spectrophotometry remains the reference approach for aggregate determinations such as total polysaccharides, total flavonoids, and total saponins, using carefully controlled extraction and colorimetric reaction conditions. Inductively coupled plasma optical emission spectrometry and inductively coupled plasma mass spectrometry, performed in accordance with the multi-element method of the GB 5009 series, deliver accurate quantification of nutritional minerals and contaminant elements down to trace levels.
Microbiological and Molecular Techniques
Viable probiotic counts are enumerated using the selective culture methods of the GB 4789 series for Lactobacillus and Bifidobacterium, complemented by biochemical and molecular identification to confirm strain identity. Quantitative polymerase chain reaction and related genotypic methods support strain-specific verification for products whose health function depends on a defined microbial strain.
Method Validation and Development
Every method applied to a registration dossier must be validated or verified in the receiving laboratory for specificity, linearity, range, accuracy, precision, detection and quantitation limits, and robustness. Where no national or pharmacopoeial standard exists for a marker compound, the laboratory develops a method supported by full validation data, spectral or chromatographic evidence of identity, and sample matrix interference studies, and this method research report is submitted as part of the product technical requirements. Stability-indicating capability must be demonstrated through forced degradation studies so that the assay remains reliable across the shelf life.
Applications
- Registration dossiers for health foods seeking approval of new health functions or non-catalog raw materials.
- Filing applications for vitamin and mineral nutritional supplements and catalog-based formulations.
- Imported health food applications, where the same functional ingredient data requirements apply to the product intended for the Chinese market.
- Registration renewal at the five-year certificate expiry, supported by current test data reflecting the approved formula and technical requirements.
- Post-approval changes to formula, process, or specifications that require supporting comparative testing.
- Label claim verification and annual quality review for license holders.
- Post-market surveillance, complaint investigation, and batch release testing by manufacturers.
- Export support, mapping Chinese functional ingredient specifications to international buyer and regulatory documentation requirements.
FAQ
What is the difference between registration and filing for health foods?
Registration is the approval route for products that use raw materials or health functions not included in the official catalogs and requires a full technical dossier including functional ingredient test reports. Filing is a simplified administrative route available mainly for vitamin and mineral supplements and products based exclusively on catalog-listed raw materials, but it still requires testing demonstrating compliance with the announced technical requirements.
Which components must be tested in a registration application?
All functional ingredients that support the declared health function, plus the characteristic components used to control the quality of key raw materials, must be identified and quantified. The selection is justified in the formula analysis and becomes the set of indicators and acceptance limits stated in the product technical requirements.
How many batches of samples are required?
Functional ingredient testing is typically performed on samples from production-scale or validation batches, while stability testing requires three batches stored under accelerated and long-term conditions and tested at scheduled intervals through the proposed shelf life.
What if no national standard method exists for our marker compound?
The testing laboratory develops and validates a laboratory method, documenting specificity, accuracy, precision, linearity, limits, and matrix effects, and the method validation report is submitted to the regulator together with the proposed specification for review and incorporation into the approved product technical requirements.
Do imported health foods follow the same testing requirements?
Yes. Imported products are tested on samples of the exact formulation intended for market entry, using the same national standards and qualified laboratory requirements, and the resulting reports are submitted alongside the additional documentation required for imported product applications.
How is the stability of functional ingredients demonstrated?
Three batches in commercial packaging are stored under accelerated and long-term conditions, with functional ingredient content, degradation trends, and related substances monitored at intervals. The data support the proposed shelf life and justify the content limits set in the technical requirements.
How should a sponsor choose a testing provider?
Testing must be entrusted to laboratories holding the domestic testing qualification required for registration work and operating an ISO/IEC 17025-accredited quality system, with demonstrated method experience for the specific dosage form and marker compounds involved. Early technical consultation on the testing protocol helps prevent protocol gaps that could delay dossier review.