Prebiotic and Fiber Claims in Thailand: The Numeric Thresholds Behind "Source of Fiber"

Fiber and prebiotic claims sit across two entirely different parts of Thailand's labeling framework, and functional food brands frequently collapse them into a single question when they are not. Whether a product can say "source of fiber" or "high fiber" is a nutrient content claim, governed by fixed numeric thresholds. Whether a product can say a specific fiber ingredient supports digestive health, or any other functional benefit, is a health claim, governed by an evidence-based substantiation standard. Both matter for a fiber-forward functional food launch, and neither substitutes for the other.

The Numeric Thresholds for a Content Claim

Thailand's nutrient content claim conditions for dietary fiber trace to Notification of the Ministry of Public Health (No. 182) B.E. 2541 (1998), Re: Nutrition Labelling, now carried forward under Notification No. 445 B.E. 2566 (2023), which replaced No. 182 as part of Thailand's broader 2023 to 2024 nutrition labeling modernization. The thresholds themselves are specific and format-dependent.

A formulation has to clear one of the two stated pathways for a given tier, either the per-100g figure or the per-100-kilocalorie figure, whichever the product's format makes relevant, and needs to hold that figure across shelf life the same way a nutrition facts panel figure has to remain accurate throughout the product's dated life, not just at the moment of manufacture. A fiber-fortified product formulated to just clear the 3g per 100g "source of fiber" threshold at production, with no margin for any degradation of the added fiber fraction during storage, risks falling out of compliance with its own printed claim before the product reaches the end of its shelf-life window.

Why the Content Claim Is Only Half the Question

Clearing the numeric fiber content threshold answers only whether a product can carry the word "fiber" on its label as a nutrient content statement. It says nothing about whether a product can claim a specific functional benefit tied to that fiber, a claim that it supports gut health, aids digestion, or delivers a prebiotic effect feeding beneficial gut bacteria. That functional statement is a health claim under Notification No. 447 B.E. 2566 (2023), evaluated separately and by a different standard entirely. A product can legitimately clear the "high fiber" content threshold and still have no basis whatsoever to make a functional or prebiotic claim about that fiber, if the specific fiber ingredient and dose used have not been separately substantiated for that functional effect.

This is where the prebiotic category specifically diverges from a generic dietary fiber claim. Not every dietary fiber functions as a prebiotic, and Thailand's evidentiary bar for a genuine prebiotic function claim, one asserting the fiber selectively feeds beneficial gut microorganisms and produces a defined health benefit, sits at the same tier as any other functional or disease risk reduction claim under Notification 447: it needs either a pre-approved statement matching one of the notification's fixed claim texts, or a case-by-case dossier built on human intervention studies, systematic reviews, or meta-analyses submitted for evaluation by the Center for Nutrition Assessment and Health Claims of Thailand.

The BENEO Precedent as an Evidentiary Marker, Not a Template

BENEO's chicory root fiber ingredient, Orafti Inulin, became the first ingredient-level product in Thailand to secure an exclusive prebiotic function claim from Thai FDA, evaluated through CNACT's rigorous review process on the strength of human intervention studies together with systematic reviews and meta-analyses, the highest tier of evidence CNACT considers. That outcome establishes what kind of evidentiary package actually clears Thailand's bar for a prebiotic function claim: not marketing literature describing inulin's general reputation as a prebiotic fiber, but a dossier assembled specifically around the ingredient in question and reviewed on its own merits. It does not establish that inulin as an ingredient category is now generally cleared for the claim; the approval is specific to BENEO's own submission and its own ingredient, and a different company's inulin-based ingredient would need to build and submit its own case rather than cite BENEO's outcome as precedent.

Where Formulators Most Often Get the Math Wrong

A recurring formulation error is calculating the fiber content claim off a supplier's certificate of analysis for the raw fiber ingredient itself, rather than off the finished product's own analytical testing. A supplier's data sheet for an inulin or resistant dextrin ingredient states the fiber content of that raw material at a defined purity, not the fiber content the finished, diluted, and processed product will actually deliver per 100 grams once blended into a beverage, bar, or powder format and after any processing losses. Thai FDA's content claim thresholds apply to the finished product as sold, and a formulator working backward from a raw ingredient's data sheet rather than forward from the finished product's own tested fiber content routinely overstates what the label can legitimately claim. This is compounded for liquid formats specifically, where the per-100-kilocalorie threshold rather than the per-100-gram threshold governs, and a low-calorie beverage can clear the fiber claim at a much lower absolute fiber gram count than a solid food would need, a distinction formulators moving a fiber ingredient from a bar format into a beverage format sometimes miss in either direction.

Practical Sequencing for a Fiber-Forward Product

The workable sequence for a functional food brand building a product around a fiber or prebiotic ingredient starts with the content claim math: confirm the finished formulation, at end of shelf life and in its actual serving size, clears whichever fiber content threshold the brand wants to print on the label, accounting for any degradation the specific fiber fraction experiences in that food matrix over time. That is a formulation and stability question, resolvable with standard analytical testing. The functional or prebiotic claim question runs on an entirely separate track and timeline: check first whether the specific ingredient and claim wording already match one of Notification 447's pre-approved statements, since a matching pre-approved claim requires no additional dossier at all. If no pre-approved statement fits, the case-by-case CNACT submission needs to be planned as its own workstream from early in product development, not treated as a formality to resolve after the fiber content itself has already been finalized and the label copy already drafted around an unsubstantiated functional claim.

DeeMED helps functional food brands separate these two questions early, so a fiber-forward product does not end up with formulation decisions locked in around a health claim that was never actually cleared through Thailand's health claim substantiation process.