Dear Islamic brothers! After hearing the medical benefits of Wudu, you would be pleased but I must tell you that all the medical science is based upon assumptions. Scientific research is never final and undergoes changes with the passage of time. However, the commandments of Allah عَزَّوَجَلَّ and His Beloved Rasool صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم are final and these will never change.
We should act upon the Sunnah only for the pleasure of Allah عَزَّوَجَلَّ and not for attaining medical benefits. Hence, if anyone performs Wudu to normalize blood pressure or to get refreshed, observes Sawm ﴿صَوۡم﴾ to improve health or to look smart, travels to Madinah for change of climate and to get rid of business tension, reads religious books to pass his time, then he will not gain reward. However, if we act for the pleasure of Allah عَزَّوَجَلَّ, we will get reward as well as its worldly benefits. Therefore, we should perform Wudu just for the pleasure of Allah عَزَّوَجَلَّ following its apparent and inner manners.
Hujjat-ul-Islam, Sayyiduna Imam Muhammad Bin Muhammad Bin Muhammad Ghazali رَحْمَةُ اللهِ تَعَالٰی عَلَيْه has said, ‘When you are going to start Salah after you have made Wudu, then ponder over the fact that you have apparently purified the external parts of your body which people see but it is improper for you