Conclusion
Eucalyptus leaves have become one of the most popular herbs with therapeutic purposes. The leaf cannot be swallowed but it can be modified into tea or an oil. It is important to speak with your doctor before using the oil or taking the tea.
References;
[1] https://www.mayoclinic.org/symptoms/nasal-congestion/basics/definition/sym-20050644
[2] https://coughpro.com/blog/cough-frequency-what-do-we-know/
[3] https://www.mayoclinic.org/symptoms/headache/basics/definition/sym-20050800
[4] https://www.everydayhealth.com/mucus/
[5] https://www.healthline.com/nutrition/antioxidants-explained
[6] https://medlineplus.gov/heartdiseases.html
[7] https://www.mayoclinic.org/diseases-conditions/dementia/symptoms-causes/syc-20352013