**4. Conclusions**

This study aimed to produce a multifunctional yogur<sup>t</sup> rich in phytochemicals using Chinese sweet tea extract. The addition of the Chinese sweet tea extract did not influence the viability of the yogur<sup>t</sup> culture but significantly enhanced the biological activities of the yogur<sup>t</sup> samples, including their antioxidant, anticancer, and antihypertensive activities. The addition of Chinese sweet tea at concentrations of 0.25% and 0.5% significantly improved the aroma of the yogur<sup>t</sup> samples compared to the control yogur<sup>t</sup> sample. Although the yogur<sup>t</sup> sample containing 1% Chinese sweet tea extract exhibited the highest antioxidant, anticancer, and antihypertensive activities, it received the lowest aroma score due to the bitter aftertaste of rubusoside. Overall, the yogur<sup>t</sup> sample containing 0.5% Chinese sweet tea extract had significantly higher biological activities and sensory evaluation compared to the control yogur<sup>t</sup> sample. Therefore, 0.5% Chinese sweet tea extract appears to be an e fficient option and a promising ingredient for producing a multifunctional yogur<sup>t</sup> rich in phytochemicals with health-promoting properties.

**Author Contributions:** Investigation, formal analysis, and writing—original draft, M.A.-H.; methodology, Z.H., T.S., T.E., and A.M.H.; funding acquisition and project administration, L.L.; investigation and writing—review and editing, E.R. All authors have read and agreed to the published version of the manuscript.

**Funding:** The project was financed by the Guangxi Engineering Research Center (Project of Quality, Safety and Technology for Bu ffalo Dairy).

**Acknowledgments:** The authors gratefully acknowledge Wenxi Xu and Nana Takeda from Hiroshima University, Japan, for their assistance in determining the anticancer activity.

**Conflicts of Interest:** The authors declare that there are no conflicts of interest.
