Nutrition Label Compliance: Verifying Declared Values Under GB 28050
What to Check on a Nutrition Label
The nutrition label (nutrition facts panel) of pre-packaged food must declare energy, protein, fat, carbohydrate, sodium and more, and state the nutrient reference value percentage (NRV%). GB 28050 requires declared values to be truthful and supported by test data; market supervision compares measured values with declared values through sampling, and exceeding the allowable tolerance means nonconformance. Declared values should be based on stable formulations and test data rather than filled in arbitrarily; regular checks identify and prevent label compliance risks early.
How Allowable Tolerances Are Defined
GB 28050 sets allowable tolerances for core nutrients: for may-exceed indicators such as protein, carbohydrate and dietary fiber, the measured value must not be lower than 80% of the declared value; for may-be-lower indicators such as energy, fat and sodium, the measured value must not exceed 120% of the declared value; vitamins and minerals follow specific multiples. The tool applies the corresponding tolerance rule automatically by nutrient category. Because different nutrients tolerate deviations in different directions, the tool matches the rule by indicator type automatically.
How to Judge Compliance
Enter the declared values and measured results from several batches (at least 3 batches covering different stages of shelf life are recommended), and the tool calculates the relative deviation of the mean measured value from the declared value for each item and judges: within the tolerance range means compliant; near the boundary is flagged as a risk (formulation or raw-material fluctuation); exceeding the limit is noncompliant with correction directions (adjust declared values or stabilize the formulation). Multi-batch testing reflects between-batch variation and represents label compliance better than a single batch; the tool gives a clear compliance conclusion for each nutrient.
How to Use It (Step by Step)
Enter the declared values from the nutrition facts panel, enter the test data (multiple batches allowed), select the product category, and the tool judges each item's compliance automatically and outputs a verification report. Note that energy can be calculated from protein, fat, carbohydrate and dietary fiber, and the tool supports automatic energy conversion for cross-checking. Test methods and sampling must be compliant. The report should record the product batch, test method and data source so it can support regulatory re-inspection.