HUBERMAN: In order to find out the lethal dose of something, as you can imagine, unfortunately, the way these studies are done is they give animals more and more, that is higher and higher doses of a given compound, find out at what point about 50% of the population of those animals starts to die, and then that's the so-called LD50, or at least that's one crude way of describing it
Byndloss MX, Olsan EE, Rivera-Chvez F, Tiffany CR, Cevallos SA, Lokken KL, et al
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You can then build on this and increase the time it is kept on
PMID 29236221