The LD50 for elemi oil is: Oral-Rat 3370.00 mg/kg. For an adult human at 75kg, that comes to 252.75g (222.42 ml), or about 1 cup of elemi oil. No one is taking anything close to that much. Considering elemi oil is about 4% elemicin 222 ml of oil would contain about 8.88 ml of pure elemicin (about 10 grams). But the oil contains a lot of toxins. It's hard to say if the elemicin is the cause of the LD50 or something else is.

It's very likely that the LD50 of elemicin is similar to myristicin and safrole. Myristicin has an LD50 of Oral-Rat 4260.00 mg/kg. Safrole's LD50 is Oral-Rat 1950.00 mg/kg. That's much safer than most drugs people use on this forum! Safer than mescaline, caffeine, etc. I'd guess that elemicin's LD50 is somewhere along those lines. But I can't find it listed anywhere. I've searched for it everyday for weeks now.