The second detail is actually a very well known use for capsaicin: natural pest repellent! Once a plant starts growing, things are not rosy and fine all the time. In fact, the growing process is tough and plants have to survive all types of hardships; from extreme weather conditions to natural predators and getting enough nutrients. What if you could erase one of those hardships? Capsaicin is a natural repellent for insects and even fungi, so the fruit is more likely to develop and mature as it should.