My go-to source of info about supplements for PCa

IMO the best source of current, high-quality information about supplements for prostate cancer is the National Cancer Institute's "PDQ" guide on this topic. PDQ guides cover a wide range of prostate-cancer topics, including diagnosis and treatment, and are regularly updated. Most are available in two versions, a "Health Professional Version" and a simpler "Patient Version." You'll find the link to "other" version on the Guide's first page under the Guide's title, but the Health Professional Version is usually quite straight-forward.

Prostate Cancer, Nutrition, and Dietary Supplements (PDQ®)–Health Professional Version (Latest update 01/13/2023)

The hyperlink doesn't work, so copy and paste the url:

https://www.cancer.gov/about-cancer/treatment/cam/hp/prostate-supplements-pdq

There are summaries of lab, animal, and human testing with references. See also the section at the bottom, "about This PDQ Summary."
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My thoughts:

Many supplements are probably ineffective and a waste of money. Some phytochemicals that demonstrate activity directly on cancer cells in the lab can't reach our healthy or malignant prostate tissue in sufficient concentration when taken orally as supplements because of their low bioavailability. Be aware that supplements may be toxic if taken in excess and some should be avoided if you have certain conditions. If you are interested, I suggest doing your research to make wise choices. Read the labels on the backs of products to compare brands. The dose stated on the front label is usually "per serving," which may be more than one capsule or tablet. You'll see the daily serving size on the back label. This can complicate dose and price comparisons.

Pomegranate is an interesting case. Results have been mixed and one study found that while there was no overall benefit, men with a certain genotype (22% of the participants) may benefit (slower disease progression).

Djin