If you use the same tea bag do get more caffeine?

No, you won't get more caffeine by steeping the same tea bag multiple times. Here's why:

* Caffeine Extraction: When you steep a tea bag, the hot water extracts the caffeine and other compounds from the tea leaves. The first steep extracts the most caffeine, as the leaves are fully loaded.

* Diminishing Returns: With each subsequent steep, the amount of caffeine extracted decreases significantly. The tea leaves become depleted, leaving less caffeine to be released.

* Taste & Flavor: While you might get a slightly weaker brew, the flavor will also become more bitter and less enjoyable with multiple steeps.

Bottom line: It's best to use a fresh tea bag for each cup of tea to ensure optimal caffeine content and flavor.