**5. Conclusions**

In conclusion, epidemiological, clinical, nor other studies have provided the conclusive answer to whether or not Vitamin E slows the progression of MCI. Further research with human subjects is needed to understand the safety and efficacy of Vitamin E as a nutritional

supplement to promote health ageing. Future research to understand the physiological process of alpha tocopherol on cognitive process in human beings can be conducted.

**Author Contributions:** Conceptualization, R.L. and M.S.; methodology, R.L., M.S., K.B.; software, R.L., K.B.; validation, K.B., F.B.B., M.S.; data curation, R.L.; writing—original draft preparation, R.L., M.S., K.B., F.B.B.; writing—review and editing, K.B., F.B.B.; visualization, R.L., K.B.; project administration, R.L., M.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
