Is it poisonous to reheat tea in a microwave?

Reheating tea in a microwave does not make it poisonous. However, it can affect the taste and flavor of the tea, and it can kill beneficial bacteria and antioxidants present in the tea. Tea contains delicate and complex compounds, so when exposed to high temperatures in a microwave, some of these compounds may be affected, resulting in a different flavor and loss of nutrients.

Additionally, microwaving can make the tea lose some of its freshness, as the process might alter the chemical composition of the tea and cause it to taste flat and less aromatic.

If you prefer to reheat your tea, it's generally recommended to do so gently on the stovetop or by adding hot water to a fresh batch of tea. This helps preserve the flavor, nutrients, and freshness of the tea.