Before Printing a Best-Before Date: What Shelf-Life Testing Must Establish

A date printed on a food package is a claim about the product’s future. It says that, under stated conditions, the food will remain suitable until that point. The date cannot be established by copying a competitor’s label, choosing a round number that suits distribution or testing one fresh sample and assuming the result continues unchanged for months.

Shelf life belongs to a particular food, process, package and storage scenario. Change one of those and the evidence may no longer answer the same question. A sauce in a sealed retail pouch is not automatically equivalent to the same sauce in a jar, and an unopened package is not the same product condition as a container repeatedly opened in a household kitchen.

Start with the claim you actually intend to make

Describe the product precisely: ingredients and formulation, processing, package, serving or preparation instructions, and the distribution route. State whether it is intended for ambient, refrigerated or frozen storage. Identify what happens after opening and whether the consumer is expected to cook it. Those details guide the assessment; they are not minor label copy to add after testing.

The Food Safety Authority of Ireland defines validation as obtaining and documenting evidence for the accuracy of shelf life under reasonably foreseeable conditions. Its guidance emphasizes that no generic method fits every food. This is useful technical guidance, not a replacement for the Philippine requirements applying to a particular manufacturer and product. Source 1

Safety and quality can reach their limits at different times

A food may lose its intended texture or aroma before it becomes unsafe under its validated conditions. Conversely, an unacceptable hazard may not announce itself with a visible change. The study therefore needs defined endpoints rather than a vague question about whether the product “still looks okay.”

FSAI’s explanation of European date marking distinguishes a quality-oriented best-before date from a use-by date applied to certain highly perishable foods. It also distinguishes unopened storage from conditions after opening. Those are jurisdiction-specific explanations. A Philippine producer needs to verify the correct local and destination-market wording rather than transplant the European label rule automatically. Source 2

Testing needs an appropriate design, not the longest menu

A laboratory can help determine which tests answer the product’s questions. An indiscriminate list of analyses may spend money without establishing the required claim. The appropriate design depends on the hazard assessment, expected deterioration, formulation, processing and use. The business should be able to explain why each measurement is included.

DOST’s May 2021 description names the Regional Standards and Testing Laboratory in Western Visayas and directs enquiries through a Provincial Science and Technology Center. Its initial shelf-life service covered ambient-stored fried snacks and bakery products; prospective clients were screened on ingredients, processing, packaging, storage, target shelf life and ability to supply samples from one batch. This is a documented Philippine starting point, not evidence that the same scope, price or availability applies today. Ask the regional or provincial office to identify a laboratory whose current scope covers your product before commissioning tests. Source 4

Bring the laboratory the real production information, not a simplified home-recipe summary. Specify ingredient tolerances and handling steps that might vary between batches. Discuss which samples represent the product’s ordinary and reasonably adverse conditions. A laboratory cannot compensate for a manufacturer withholding the variable that determines the risk.

Time and temperature belong inside the evidence

Storage conditions need to resemble the intended and reasonably foreseeable route. A sample kept under ideal refrigeration tells a different story from a product expected to pass through distribution with defined temperature variation. Neither an unrealistic worst case nor an unrealistically perfect case should be chosen merely to produce the preferred answer.

Accelerated quality studies can be useful where the mechanism and interpretation are appropriate. They are not a universal shortcut for predicting microbiological safety or every failure mode. A competent laboratory must justify the relationship between the test and the claimed conditions. Do not invent a rule that one warm week always equals a fixed number of months on a shop shelf.

Likewise, a challenge study is specialist laboratory work, not an experiment for a home kitchen. Where a hazard assessment requires such evidence, use appropriate professional facilities and methods. Do not deliberately inoculate food or improvise pathogen testing to decide whether a commercial product is safe.

A sealed pack is not the same thing as a validated process

New Zealand’s Ministry for Primary Industries describes packaging as needing to suit the food and its conditions of use throughout shelf life. Material, seal, temperature and duration all matter. A package that looks intact at dispatch still needs to perform after transport and storage. This technical principle is relevant without treating New Zealand’s rules as Philippine law. Source 3

For ready-to-eat foods, the question of whether a relevant organism can grow requires evidence about the actual product. MPI’s Listeria guidance illustrates why growth potential matters in assessment. It does not support assigning the same shelf life to every chilled dip, cooked filling or dessert, and no numerical New Zealand limit is being adopted here as a Philippine requirement. Source 5

Validation is followed by verification

A successful study does not relieve the producer of controlling future batches. Keep the formulation, process and package within the conditions the evidence covers. Investigate complaints and unexpected test results instead of assuming the original date protects every later lot. FSAI’s verification guidance specifically recognizes periodic checking and reassessment when a food or its process changes. Source 6

Records should connect the commercial product to the study. Keep the tested formula version, package specification, sample identifiers, storage conditions, methods, results and the rationale for the chosen date and instructions. The decision should be reproducible by someone other than the person who commissioned the tests.

A margin between the demonstrated limit and the declared date may be appropriate, but it should be justified by the assessment rather than selected as a decorative safety cushion. Nor should the business quietly extend the date because stock is moving more slowly than expected. Commercial difficulty is a reason to revisit production and distribution, not to change the food’s biology by relabelling it.

Ask the laboratory a better question

Instead of asking “How many months can I put on this?”, explain the proposed product and selling route, then ask what evidence is needed to support them. The answer may change the packaging, process, storage instruction or intended market before it produces a date. That is useful product development, not an inconvenient detour.

The strongest shelf-life claim is the one the business can explain from production through the final intended use. It distinguishes safety from quality, follows the real package and conditions, and remains under review when the product changes. A defensible date is the conclusion of that work—not the starting assumption printed on a label and sent to a laboratory for confirmation.