I really don't think PED's "Keep one from getting injured" .... they are used more as rehab / healing aids than for prevention.
@CloakNNNdagger can correct me on this if I'm off base.
Not really .... it's more an elasticity issue than a strength one.
Again , I could be wrong , I'm no doctor but I have had pulled hammy's many times in the past and was always told that stretching was what prevents these rather than actually being "stronger". The more elastic those muscles , the more stress they can take. Running stretches them out like rubber bands , the more elastic they are , they further they can stretch without tearing (A pull is a tear).
Worst part is that during the healing process , you cannot stretch or stress those muscles or you risk further / re-injury. It has to heal literally 100% prior to restarting activities.
I pulled / tore an abductor in my left leg in January of this year and every time I'd stand up without using my hands to take some of the weight off , I'd re-injure it. Took several months to heal.