In theory shockwave therapy improves circulation in the penis. Most reviews I've read say it has a small short term effect. It doesn't address the root cause of the problem. Clogged arteries are caused by vitamin K2 deficiency, combined with magnesium deficiency and excess calcium consumption. In addition to causing Erectile Dysfunction, it is also the leading cause of death; heart attack.
I had symptoms of an impending heart attack when i was 60 (chest pain and numbness in the left arm). I took vitamin K2 MK-7 and magnesium supplements. My symptoms gradually went away and so did my old age erectile dysfunction.