Benificial to or for

  1. We believe it would be beneficial for people if we redouble our efforts in research and accumulation of the clinical data for the post-marketing drugs

  2. We believe it would be beneficial to the people if…

  3. We believe it would be beneficial to the nation and the people if…

Which one is the best?

I would just omit the prepositional phrase entirely: ‘it would be beneficial if we redouble our efforts’.