"Smelling better" isn't a straightforward claim. It depends very much on how you smell by default.

I believe that some nerds smell bad because their body is afraid of social interaction and therefore produces substances that repell other people and indicate that other people should keep distance. In that case I don't think that those bacteria are enough even if they manage to solve the issue of smell for the average person.

When it comes to healthy skin and reducing acne, I guess that it's often important to try a lot of products till you find the right one.

If you want to know whether it's effective, what effects do you want to achieve with it?