Quick answer
Set shelf life from evidence about the actual food, hazards, formulation, processing, packaging and reasonably foreseeable distribution, storage and use. Validate the proposed life before sale, apply the appropriate date/storage instructions and verify that the evidence remains valid. Similar products, smell or a single satisfactory test are not enough to copy a date. Changes to ingredients, process or packaging require review.
Shelf life is a supported product decision
Safety and quality are different endpoints. A use-by decision concerns safety, while best-before relates to quality; the correct date and instructions depend on the product.
FSS shelf-life guidance states that no standard method fits all foods. The business remains responsible for the actual product and the evidence supporting its life.
Build a product-specific evidence file
| Element | Evidence to consider |
|---|---|
| Product | Ingredients, formulation, pH/available water and relevant variability. |
| Hazards | Relevant organisms, contamination and ability to grow/survive. |
| Process | Treatment, cooling, handling and hygienic controls. |
| Pack | Suitability, integrity and atmosphere. |
| Distribution/use | Foreseeable temperatures, time, opening and consumer handling. |
| Supporting studies | Applicable literature/history, modelling and suitable laboratory studies. |
| Decision/review | Date/instructions, justified scope, verification and change triggers. |
Choose suitable validation methods
Use evidence that genuinely applies to the food and conditions. Appropriate approaches can combine reliable literature/historical information, predictive modelling, durability studies and specialist challenge testing.
Models have scope/assumptions, and studies need representative batches and foreseeable conditions. Agree the design with competent technical/laboratory support; never deliberately inoculate food with pathogens in an operating kitchen.
Check all hazards and current applicable criteria
Vacuum-pack guidance controls particular botulism risks. Meeting a packaging-related time limit does not validate the whole product’s life against Listeria or other hazards.
Current FSA management guidance distinguishes relevant GB/NI legal frameworks and updated Listeria information. Confirm applicable product/nation criteria rather than copy a number from another product or an older document.
Worked example: changing the pack
Hypothetical example: a producer moves a chilled food into a lower-oxygen pack and keeps the old date because the recipe is unchanged.
The business reviews the changed atmosphere, relevant hazards and evidence before release. The same recipe does not establish the same microbial behaviour under a different pack.
Verify the life and manage changes
Once the date is supported, use proportionate ongoing checks to confirm continued suitability. Review trends, supplier changes, formulation, equipment, hygiene, storage and complaints.
Keep the evidence, decision and scope clear, including unopened and after-opening instructions. Do not extend an expired use-by or other applicable ingredient deadline by printing a new label.
Next steps
Compile the product/process/pack assumptions before choosing the date. Connect evidence review with HACCP review and controlled recipe changes.
Read official shelf-life guidance — Plan product-specific evidence, study design and review.