First of all I’m not really sure about this, but a couple of things. One we know that PRP enhances healing. That said it seems to me that circumstances would have to be created or already exist that would require healing in order for this to be an effective adjunct. So it actually makes sense to me that the use of the VED concurrently with the shot would be necessary unless there already is an injury there or the conditions are already there but are exceeding the healing capacity of the host.
With that said if someone doesn’t think that penile traction or the use of a VED for PE works, then they’re also unlikely to think that the PRP would do anything beyond maybe providing healing for an existing condition.
Another thing, if a practitioner has competing interests to the Pshot, they’re likely to favor their offerings and are probably going to be biased, especially if they genuinely believe their approach is better. Moreover they are not likely to endorse something without sound clinical data, so there’s always that, keeping in mind that most of what could be regarded as valid clinical data is focused on rehabilitation or restoration rather than enhancement.
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