I am generally very skeptical of food claims, because they're difficult to test.
However, Pomi-T is the one supplement which has been through a double-blind randomised control trial and shown to be beneficial.
The scenario was that is was provided to men on Active Surveillance and Watchful Waiting, and it had a very significant impact on reducing the rate of PSA increase versus those on a placebo. We do know of things which reduce PSA but don't actually impact prostate cancer, such as 5 𝞪-reductase inhibitors, so an interesting question was did the Pomi-T actually result in less tumour growth? A second project was undertaken for those participants who had multiple MRI scans during their AS/WW, and this showed that the change in PSA levels did correlate with tumour size, so the Pomi-T was not just reducing PSA over the placebo branch, it was actually resulting in similarly smaller tumours than in the placebo arm.
I thought there was also a trial on reducing recurrence rate after treatment, but I can't find that one at the moment.