It's been around for over a decade, under various names like
P-Shot,
Priapus Shot,
Platelet Rich Plasma, or
PRP Therapy.
At various times it's been promoted as a "possible" solution for penis enlargement, Peyronie's disease, erectile dysfunction, rejuvenation, etc. Users never seem to report any gushing successes, but no devastating disasters either.
It looks like wishful-thinking in search of a success-story, but never quite finding one.
Here are some past threads that focus on it, or compare it with other treatments.
The "p shot" from men's clinics
The priapus shot
PRP Therapy for PE
P Shot And Gainwave
P-shot
Priapus shot?? Anybody had that?
PRP Therapy for PE
The latest PE technique