Your link is an oft-debunked misinformation campaign[1]. In my opinion, the best current review is the Cochrane review[2]. And indeed, I think "anyone who look

Your link is an oft-debunked misinformation campaign[1]. In my opinion, the best current review is the Cochrane review[2]. And indeed, I think "anyone who looked into it never saw it work, ever. At all" is overstating the case. There is weak evidence that it works. That could easily go one of two ways: a highly powered RCT (like ACTIV-6) could show that it doesn't work at all, or we could find that it shows some improvement but is definitely not a silver bullet. [1]: https://ebm.bmj.com/content/early/2021/05/26/bmjebm-2021-111678 https://ebm.bmj.com/content/early/2021/05/26/bmjebm-2021-111... [2]: https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD015017.pub2/full https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD...