I've taken bodybuilding for quite some time now, and though I don't work out right now (due to a muscle injury), it helps. It helps a lot. Even in a week, I could feel my stamina increasing immensely, and I had much more strength than before. So yes, it does help. You can take multivitamins and hope for the best, but from my experience, that doesn't really help.
What really helps, aside from having physical exercise, is a very healthy diet and sleep schedule. And by healthy, I don't mean food that's not fattening or whatever, I mean food that's nutritious. Just try to have a balanced and nutritious diet and you'll be doing great.