There is no single, universally accepted "success rate" for VPT that can be applied to every ED patient. Treatment outcomes depend on the cause, severity, vascular health, and overall condition of ED.
If your VPT specifically involves low-intensity shockwave-based vascular therapy, clinical studies have reported improvements in erectile function in some men especially in select cases of mild to moderate ED. However, study results are not completely consistent, and key guidelines also reflect limitations in patient selection and evidence.
Therefore, I wouldn't recommend citing a fixed percentage as a guarantee. It's important to first identify whether the primary cause of ED is vascular or is also due to stress, diabetes, hormonal factors, lifestyle, or another health condition.
If you are considering VPT, you can consult Gautam Ayurveda to diagnose your condition and understand whether VPT is the right option for your case.