Which of the following is not required for a good health?

For good health, a person should develop a habit of practicing personal and social hygiene. Good hygiene practices help maintain proper health and prevent the spread of diseases. Additionally, an adequate nutritional or balanced diet is a must for good immunity, especially for the proper growth and development of children. Immunity can also be increased against certain dreadful diseases by vaccination or following immunization programs whenever required for different age groups. 

Blood transfusion is a prophylaxis measure required in cases of trauma or accidents, or during the course of any treatment by the patient.

Thus, blood transfusion is not a necessity for good health.