> An "exquisitely low dose" should be safe.

The problem is that a subset of self-experimenters have the mindset "the more, the better" -- I still remember the Covid-era vitamin D discussions, with people openly reporting taking stupendous daily doses. (Lithium and vit. D are not in the same category, but you'll recognize the approach.)

So someone goes overboard, maybe damages their health, and traces it back to an article without the caveat. Lawsuit time! We're talking about fractions of a percent here, but with a wide enough potential readership you have a non-trivial chance of a hit. Common sense doesn't work at scale. Hence the CYA rhetoric.