1. Promote digestion: Both black tea and osmanthus tea can promote digestion, and soaking together can better promote digestion.

2. Relieve fatigue: Caffeine in black tea and nutrients in osmanthus tea help to improve the energy level of the body and relieve fatigue.

3. Improve your breath: osmanthus tea tastes fragrant and can improve your breath. Soaking in black tea can help freshen your breath.

4. Lowering blood sugar: osmanthus tea has the effect of lowering blood sugar, and soaking in black tea can enhance the effect of lowering blood sugar.

It should be noted that if you have stomach trouble or are sensitive to caffeine, you should drink it in moderation. At the same time, it is best to control the water temperature and time when making tea, so as not to affect the release of nutrients.