**5. Conclusions**

Considering the complex and strong relation between DM and PD and the paucity of available clinical evidence for the effects of ascorbic acid in individuals affected by both conditions, further detailed studies should be performed to establish the efficacy of vitamin C for these patients. Besides the

issue of the required doses, the frequency and duration of administration for ascorbic acid supplements need to be clarified.

**Author Contributions:** Conceptualization: M.B. (Maria Bogdan), P.S.; literature research: M.B. (Maria Bogdan), A.D.M.; methodology: A.T.-S., M.-S.S.; writing—original draft: M.B. (Maria Bogdan), A.D.M., C.E.V., D.N.G., L.B.; writing—review and editing: M.V.B., M.B. (Mihaela Blaj), P.S.; supervision: L.G.F., G.E.B. All authors have read and agreed to the published version of the manuscript.

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

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