Mackay helped in establishing medical clinics and hospitals to treat the people of Taiwan. He also stepped in as a dentist for those in need.
From far Formosa (1896) by G.L. Mackay
“Patients are treated in all the cities and villages where we may happen to be. Medicines are given, and treatment prescribed for them in their homes. The headquarters of this department…are at Tamsui. There is the hospital building, with its wards and necessary equipment…this has been a great blessing to thousands of people.” (p.316)