How much poison hemlock does it take to kill a human?

The lethal dose of poison hemlock (Conium maculatum) can vary, but it is estimated that as little as 0.1 to 0.6 grams of the plant can be fatal to an adult. This toxic plant contains alkaloids, primarily coniine, which can cause respiratory failure and death. Symptoms of poisoning can appear within hours, and immediate medical attention is crucial. However, individual susceptibility can vary based on factors like body weight and overall health.