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discriminating between good and bad advice is an ongoing challenge for us all. Requiring supporting evidence and references for an assertion is one reliable method of sorting them first into 'pursue' and 'ignore' categories, though following up with cited sources may take more time and effort...

Weird how those who frown on offering real herbs either think they aren't strong enough to make any difference, or are potentially lethal. Perhaps Stormcrow and Nuthatched should compare notes. :p

The OP is not suggesting force feeding her chickens herbs in such massive quantities that they'd be toxic. Please find and cite the quantities (with a reference) for toxic levels of say, 3, common herbs - oregano, parsley and basil, as per the OP's first post ideally.

And you were right. The article I linked for you was ignored, for whatever reason. Will a short quote from a different paper persuade you to stick with your original research findings? "5.2.1.2. Dietary supplementation of feed additives. There are current efforts in the poultry industry to use...

Indeed; that is an excellent rule of thumb for life. I think it is a pity people do not apply it also to concentrated commercial feed. Reading some posts, one wonders how they suppose any people or animals survived eating just real food, before corporations came along to process and package and...

Would you care to provide some - any - evidence (a properly written and refereed published paper, not marketing blurb or any individual's opinion) for this so-called rule that anything up to 10% is OK?

They do. You may find this useful, especially the section on wild edible plants: The use of alternative food sources to improve health and guarantee access and food intake https://doi.org/10.1016/j.foodres.2021.110709