LD50

"The lowest dose we used is what you find in natural plants, the intermediate dose is similar to what you would find in some energy drinks, and the highest amount is set to be the LD50 of bees -- where half the bees fed this dose die -- so it's likely to be quite toxic for them," says Galante.

In toxicology, the median lethal dose, or LD50, is the approximate dose required to kill half the animals in a population being studied.

The LD50 for borax in rats is about 5g per kilogram of body weight.

Even on Earth, the skin of a Colombian golden poison frog had a waaaaay lower LD50—the Lethal Dose needed to kill 50% of a test population.

It flashes, then reads: LD50.001 nanograms per kilogram.