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How Long Does Jello Last? Jello - How long does Jello Last? An unopened box of Jello gelatin can last indefinitely, whereas prepared Jello will only last about a week. The shelf life of jello can vary due to the type, packaging, storage method, and thickening agent used. Jello is typically created by adding boiling water to a powdered mix or purchased in ready made serving containers.
When it comes to jello side effects from foods and supplements, the answer you get can vary. Sugar free jello mix â whether it be a name brand like Jell-O or a generic mix â is almost always made with artificial sweeteners (and not to mention, artificial colors like Blue 1 and Red 40).