An interesting case is "Hive Alive", which purports to be a Seaweed-based probiotic for fighting the Nosemas.

Looking under the hood, it also contains Thymol - Likely the actual source of any efficacy.

There's a page of links to studies on Hivealive, which I haven't bothered to read.

Here it is for the curious and patient:
https://www.hivealivebees.com/learn-more/science-behind-hivealive








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