If you give too much of this compound, it starts killing eye cells instead of helping them—typical of many natural substances that have a narrow safe range.

A natural compound called Brosimine B helps retinal cells survive better at a very specific low dose, but hurts them if you give too much.

This compound works best at one very specific dose—too little does nothing, too much hurts—and scientists can predict this pattern very accurately with math.

This compound only works if you give it at just the right amount—too little or too much doesn’t help, so getting the dose exactly right is super important.

A plant-derived chemical from a South American tree shows promise in protecting eye cells from oxygen-starvation damage, hinting it might help with brain injuries too.

This compound helps eye cells make more of a natural 'clean-up' enzyme that fights harmful chemicals, but only if given early after stress begins.