Apparently there's a way to access ads on Facebook (now under "Meta," isn't it?) by subject (such as prostate) and then display them.
Go to
How to use Meta's Ad Library:
https://www.facebook.com/help/259468828226154/for some quick basics on using it.
Then access its search tool:
https://www.facebook.com/ads/library/?active_status=all&ad_type=political_and_issue_ads&country=us&media_type=alland use search box on screen to retrieve ads by subject. Search, for example
carson prostate
oz prostate
prostate surgery
prostate herbs
and then pick and choose from resulting display to view individual ads.
Also, for "Meta Advertising Standards," see
https://www.facebook.com/business/help/488043719226449?id=434838534925385although sampling through some of these ads does bring into question, as least in some cases I noted, whether Meta is really living up to its own standards, as far as sticking to them goes.