It's something I've read a few times. Most of the studies I've seen say it's effect is modest at best. At least if it was a drug there wouldn't be enough evidence for it to get FDA approval (especially with all the "side effects" such as injury)
Arguably this is a limitation on how the studies were done, as nobody is going to pay for extensive studies since you can't patent exercise.
Arguably this is a limitation on how the studies were done, as nobody is going to pay for extensive studies since you can't patent exercise.