Shelf Life and Expiry Date Rules for Thai Supplement Labels

Every dietary supplement sold in Thailand has to carry a date declaration, and the format that date takes is not a matter of manufacturer preference. MOPH Notification No. 293 B.E. 2548 (2005) sets out exactly how the declaration must read, and the shelf life it reflects has to be backed by the stability data a brand actually submitted at product approval. For a foreign manufacturer, this is one of those requirements that looks like a formatting detail until it collides with a shipment schedule, at which point it becomes a commercial problem.

The date declaration Thai FDA actually requires

No. 293 permits two forms of date declaration: "ควรบริโภคก่อน," meaning "should be consumed before" and functioning as a best-before statement, and "วันหมดอายุ," meaning expiry date and functioning as a use-by statement. The two are not interchangeable labels for the same concept. A best-before date signals that the product is at its optimal quality up to the stated point, while an expiry date signals the last date on which the product still meets its declared specifications. Which one belongs on a given label depends on the nature of the product and, critically, on the stability evidence the manufacturer submitted when the product was approved; the declaration on the shelf has to be consistent with what was actually filed.

Format matters as much as wording. Thai FDA's accepted date format for supplements is day-month-year, though for products with a shelf life beyond three months, a month-year format is acceptable on its own. Both English and Thai date notation appear in practice on Thai supplement labels, but the Thai-language notation is a requirement, not an option. A purely numeric date, something like 06/2028, is acceptable as long as the format leaves no ambiguity about which digits represent which unit.

Stability data is what makes the declared shelf life real

Thai FDA does not take a manufacturer's shelf life claim at face value. Stability data forms part of the product approval dossier, and the declared shelf life on the label has to trace back to what that testing actually demonstrated.

Real-time stability testing, run at 25°C and 60 percent relative humidity, carries the product through its full declared shelf life and represents the strongest form of supporting evidence Thai FDA will see. Where real-time testing has not yet run the full length of the claimed shelf life, accelerated stability testing fills the gap: conducted at 40°C and 75 percent relative humidity over six months, this accelerated data typically supports shelf life claims of up to 24 months. Either way, the dossier needs the full protocol on record, including testing intervals and the specific parameters checked (potency, physical appearance, dissolution, and microbial limits where the product type calls for it), along with the results themselves.

The storage conditions printed on the label have to match the conditions the stability testing was actually run under, and match the declared shelf life. A label reading "store in a cool, dry place, away from direct sunlight," or "store below 25°C," is only as good as the manufacturer's ability to demonstrate that condition holds through distribution. A product claiming cold-chain storage carries the added burden of proving cold-chain compliance is actually maintained at the point of import, not just asserted on the label.

Why remaining shelf life at import is a commercial decision, not just a regulatory one

Thailand does not publish a statutory minimum remaining shelf life for imported food supplements the way it does for certain pharmaceutical categories at customs clearance. That absence of a hard rule does not mean the question disappears: Thai FDA and customs officers retain the discretion to refuse entry where the remaining shelf life is short enough that commercial sale within that window is not realistic.

In practice, the market standard that has developed is that imported supplements should arrive with at least 12 months of remaining shelf life, and more is better. A shipment arriving with only 6 months remaining creates a compressed commercial window that makes the economics of the import difficult to justify, and it leaves almost no room to identify and resolve a product issue before expiry catches up with the stock still sitting in a warehouse. This is arithmetic that belongs in a manufacturer's or importer's inventory lead time planning from the start, not something discovered after a shipment has already landed with a shelf life clock that is most of the way run out.

Where the date declaration and the stability file have to agree

A frequent source of friction at review is a mismatch between what the label says and what the stability dossier actually demonstrates. A manufacturer that markets an 18-month shelf life globally but only ran real-time stability testing through 12 months, filling the remaining 6 months with accelerated data, needs that distinction reflected accurately in the Thai submission. Thai FDA is reviewing the stability evidence directly, not simply accepting a global shelf life figure on faith because it appears on packaging sold elsewhere. Where the accelerated data supports a shorter or more conditional claim than the manufacturer's home-market label suggests, the Thai declaration needs to track the evidence actually submitted, not the more generous figure printed on packaging built for a different regulatory system. Reconciling these two before submission avoids a review cycle spent explaining a discrepancy that could have been resolved at the drafting stage.

This also matters for manufacturers introducing a reformulated product or a new packaging format to the Thai market. A change in packaging material, for instance moving from a glass bottle to a different barrier material, can alter the actual stability profile even where the underlying formula has not changed. Thai FDA's review is tied to the product and packaging combination that was actually tested, so a shelf life claim validated for one packaging configuration does not automatically transfer to a different one without additional stability data covering the new format.

Building the shelf life math into market entry planning

A product with an 18-month shelf life that clears import and initial distribution in 4 months still has a meaningful commercial window left. The same product arriving with only 8 months of shelf life remaining does not, even though the underlying stability profile is identical. The difference is entirely a function of planning: when the stability dossier is filed, how the shelf life claim maps to the actual testing evidence, and how far in advance of the expiry date the shipment schedule is built. Manufacturers new to the Thai market often build their shipment schedule around production capacity and freight lead time alone, without factoring in Thai FDA's review period as a variable that eats into the usable shelf life window before the product ever reaches a Thai warehouse. DeeMED Consulting reviews stability data against Thai FDA's product approval requirements as part of our Thai FDA dietary supplement registration support, so a shelf life claim is matched to real testing evidence before a dossier is filed, and shipment timing is planned around the actual commercial window rather than discovered after the fact.