Flavor Deterioration: Over time, tea will lose its fresh flavor and aroma. The taste can become flat or stale, especially if the tea is stored improperly, such as in a humid or warm environment.
Best Before Dates: While tea doesn't go bad in the same way as dairy or meat, it often comes with a "best before" or "expiration" date.
Oxidation: Tea leaves, especially those in loose leaf form, can oxidize and degrade when exposed to air, leading to a reduction in flavor and aroma.
Storage Conditions Matter: Tea’s longevity depends significantly on how it is stored. Exposure to light, heat, moisture, and air can cause it to degrade faster.
Caffeine Content: The caffeine in tea does not degrade significantly over time. Even if the tea loses some of its flavor, it may still retain its caffeine content and can have a mild stimulating effect.
Herbal and Flavored Teas: Herbal teas and flavored blends with added ingredients like dried fruits or flowers can lose their potency more quickly than traditional tea leaves (green, black, etc.), due to the organic nature of the additives.
Signs of Expired Tea: If tea has an off-smell, mold, or any visible signs of moisture or insects, it is no longer safe to consume.