@pablo81, I also have BPH but haven't tried Himalaya Himplasia. I've been taking a generic Flomax for many years and have thought about my options. I have tried adding a few of the better known supplements that have research information available on them. While you wait for others with experience on the supplement, I thought I would share some information that I found. The only research I could find was from 2012 and is difficult for the average person like myself to understand.

" Himplasia (Himalaya) possess both alpha one adrenoreceptor blocker and 5 alpha one reductase inhibitor activities. Company also claims to inhibit stromal cells proliferation. Himplasia is introduced in tablet form and contains Gokshura (Tribulus Terrestris), Putikaranja (Casalpinia bonducella), Puga (Arega Catechu), Shatavari (Asparagus Racemosus), Varuna (Crataeva nurvala) and Akika Pisti.[64]"
--- Jan-Jun 2012 - Various treatment options for benign prostatic hyperplasia: A current update: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3425142/.

Here's a reference from April 2023 that doesn't mention the supplement Himalaya Himplasia but contains a lot of good information:
--- How to shrink the prostate naturally: https://www.medicalnewstoday.com/articles/321231