Labeled and labelled is past tense and past participle form of "label," meaning to attach a tag or description to something. The spelling differs depending on region.
In the world of product manufacturing and packaging, the choice between labelled and labeled depends on regional spelling conventions.

When is labeled used?
In American English, labeled is the preferred spelling
Example scenario
When you purchase a food product in the United States, you will typically find a labeled package with detailed nutritional information and ingredients listed clearly. This labeling not only informs consumers about what they are buying but also ensures safety by providing allergen warnings.
When is labelled used?
In British English and other varieties, labelled is used.
Example scenario
If you were to buy the same product in the United Kingdom, you would come across a labelled package, maintaining consistency with British English spelling norms. This package will also provide consumers with essential information and comply with regulations while promoting product awareness and safety.
So, whether it's labeled or labelled, this practice is a vital aspect of consumer protection and product marketing, ensuring that people make informed choices when selecting items from store shelves.
Want to sound like a native speaker?
Engram’s AI-powered grammar checker makes your English sound like a native speaker’s, suggesting natural English expressions on top of fixing grammar, spelling, punctuation, word order, and vocabulary.

Reference

