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Pruett SB, Obiri N, Kiel JL

The formation of free radicals is a physiological process of every organism, but it can happen that their presence becomes excessive and potentially very harmful, favoring a pro "oxidative stress" condition

Am Fam Physician 102(6):355362 Dodd A, Hughes A, Sargant N, Whyte AF, Soar J, Turner PJ (2021) Evidence updates for the treatment of anaphylaxis

More masculinized subjects have been described

Several technical reasons may explain our distinctive findings, including differences in the microbiome sampling site, the limited n per group, singly housing mice, or the use of highly similar lean, Western, and high-fat diets which systematically exchanged fat content with carbohydrate content

That is a very different statement from they do nothing. It means: The mechanistic rationale is real