**5. Conclusions**

M and SA alleviate the effects of heat stress in *M. arvensis* L. var*. piperascens* and *M.* × *piperita* L. by changing the yield of essential oils and the activity of antioxidant enzymes.

It is possible that the activity of the brassinosteroids highlighted by us occurs through an action by the enzymatic game involved in the metabolism of the studied essential oils. Future studies will aim to highlight a possible modification of enzymatic activity and/or a different expression of the genes involved in their synthesis in response to the presence of M and SA.

Our results can be considered for future applications in the cosmetics, food, and pharmacological fields, given the extreme importance of menthol and menthone in these areas.

**Author Contributions:** Conceptualization, M.H., V.M. and D.R.; methodology, M.H., V.M., D.R., A.T., A.A.S.-B., J.H., S.S., M.G., C.M., M.P., R.N., F.D.R., L.F., A.B.; investigation, M.H., V.M., D.R. and A.B.; data curation, L.F. and R.N.; formal analysis, A.T., A.A.S.-B. and J.H.; writing—original draft preparation, A.B.; writing—review and editing, M.H., V.M., D.R. and A.B.; supervision, A.B.; project administration, A.B.

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

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