Capsicum, also known as chilli peppers, are native to tropical America but are now grown worldwide. They contain the active compound capsaicin, which gives them their spicy heat and pungency. Capsaicin binds to TRPV1 receptors and has various health benefits such as improving circulation, lowering blood pressure and cholesterol, aiding digestion, and boosting metabolism. The Scoville scale measures the amount of capsaicin and heat in different chilli varieties. Capsicum has many uses as a spice, medicine, self-defense, and in industry.