Correction please."effective ON/IN/TO/ABOUT/FOR humans?
Q. I made a sentence below. Is this all correct sentence?
☞ It has been two weeks since they have commenced human trials, but eventually, it will turn out that the vaccine is not effective on humans.
I also wonder if besides use of "ON", there is another prepositions alternative?
For instance :
effective ON something/someone
effective IN something/someone
effective TO something/someone
effective ABOUT something/someone
effective FOR something/someone
Do these all work? Please choose all that is correct.