Choosing a laboratory to manufacture or control dietary supplements involves assessing its ability to manage a regulatory framework where market entry remains declarative. Unlike medicines, no prior approval validates the quality or effectiveness of a dietary supplement before it is marketed. The reliability of the partner laboratory thus becomes the main filter between a compliant product and a risky one.
Post-marketing control and compliance: what certifications do not cover
The majority of official controls on dietary supplements occur after they are put on sale. The DGCCRF’s investigations focus on shelf sampling, sample analysis, and verification of marketing materials. A report published in November 2025 by the DGCCRF notably highlighted prohibited health claims on practitioners’ websites, a type of violation that goes beyond mere manufacturing defects.
An ISO or GMP (Good Manufacturing Practices) certificate attests to an internal quality system. It does not guarantee that labeling, claims, or the regulatory file are compliant. A reliable laboratory must therefore demonstrate overall compliance competence, not just provide a certificate.
For a brand looking to secure the entire supply chain, Cydlab online laboratory details this integrated approach, from formulation to regulatory compliance of the finished product.
Comparative grid of reliability criteria for a dietary supplement laboratory
The criteria to examine go beyond mere quality certification. The table below compares the verification points and what they concretely reveal about the laboratory’s reliability.
| Criterion | What to check | Alert signal |
|---|---|---|
| Regulatory file (decree n° 2006-352) | The laboratory itself submits the declaration to the DGCCRF | The provider fully delegates the declaration to the client without support |
| Claims control | Proofreading of labels, web materials, and product sheets before sale | No documented process for validating health claims |
| Third-party analyses | Use of an independent organization for analyses (contaminants, dosages) | Only internal analyses, without external verification |
| Traceability of raw materials | Accessible supplier sheets, identifiable origin of active ingredients | Inability to trace back beyond the direct supplier |
| Incident management (nutrivigilance) | Formalized reporting procedure to ANSES | No documented nutrivigilance protocol |
The “alert signal” column does not indicate illegal practices, but gaps that weaken product compliance during an official control. A laboratory that does not master the validation of claims exposes the brand to a direct regulatory risk.
Bioavailability and quality of active ingredients: two measurable parameters
A dietary supplement may display a high dosage of vitamins or plant extracts while remaining ineffective if the bioavailability of the active ingredients is low. Bioavailability depends on the chosen chemical form, the encapsulation method, and interactions between nutrients in the formula.
Reliable laboratories document the titration of each plant extract. Titration indicates the actual concentration of the active ingredient, expressed as a percentage. Two extracts from the same plant can have very different titrations depending on the extraction process used.
- Check that the laboratory provides certificates of analysis for each raw material, with the titration of active ingredients clearly indicated
- Ask for the chemical form chosen for minerals and vitamins (bisglycinate, citrate, oxide), as it directly influences absorption
- Ensure that stability tests cover the claimed shelf life of the product, not just the manufacturing date
A laboratory that refuses to provide its certificates of analysis or does not specify the chemical form of the nutrients used does not allow for an assessment of the actual quality of the finished product.
Nutrivigilance and recall management: an indicator of laboratory maturity
The nutrivigilance system, managed by ANSES, collects reports of adverse effects related to dietary supplements. A laboratory that integrates this system into its internal processes demonstrates a proactive management of health risks, beyond mere manufacturing compliance.
At the same time, the public database RappelConso lists product recalls, including dietary supplements. Consulting this database allows verification of whether a laboratory or its client brands have been subject to recent recalls. This is not a disqualifying criterion in itself (a recall may result from an isolated error), but the total absence of a formalized recall procedure is a negative signal.
On the other hand, a laboratory that can present its incident management protocol, with reporting timelines and traceability of the affected batches, demonstrates a level of maturity that certifications alone do not reflect.
- Ask if the laboratory has a written nutrivigilance and recall procedure
- Check for the existence of an identified quality manager, reachable by the client brand in case of an incident
- Consult the RappelConso database for the history of products manufactured by the laboratory
Regulatory declaration of dietary supplements: a technical file, not a formality
The marketing of a dietary supplement in France requires a declaration to the DGCCRF, in accordance with decree n° 2006-352 of March 20, 2006. This declaration does not constitute an authorization. It does not imply any prior validation of the product’s quality.
A reliable laboratory does not merely fill out the form. It checks the compliance of each ingredient with the French and European positive lists, controls the maximum dosages allowed, and ensures that claims do not exceed the scope of the European regulation on health claims.
The difference between a laboratory that “supports the declaration” and one that treats it as an administrative step is measured during the first official control. The latter exposes the brand to non-compliances that could have been detected upstream.
The choice of a dietary supplement laboratory is based on verifiable elements: documented compliance procedures, accessible certificates of analysis, formalized nutrivigilance protocol, and mastery of the regulatory file. These criteria should be verified before signing a contract, not after the first DGCCRF control.
