The hepatitis B vaccine can only be injected in the upper arm in the deltoid area and not in other areas. A comparative test has been done where the hepatitis B vaccine was injected into the buttocks for intramuscular injection, and the immune effect of the hepatitis B vaccine was reduced in this case. Therefore, the hepatitis B vaccine should only be given in the upper arm deltoid area and not in other areas. The hepatitis B vaccine should also know the injection process, which is generally three injections, but if you use a larger amount of hepatitis B vaccine, that is, 60μg a hepatitis B vaccine, you only need to inject one shot, which is the injection process. After a month or so after the hepatitis B vaccination, you can also have your blood tested for the amount of hepatitis B surface antibody to determine how effective the vaccination is. If some people have frequent contact with hepatitis B patients, they can also have their hepatitis B surface antibody levels rechecked after 3-5 years to see if there is a significant decrease.