Capsaicinoids are a class of vanilloid compounds found in Capsicum species responsible for the pungent heat in chili peppers. The primary compound, capsaicin, activates TRPV1 receptors causing a burning sensation. They exhibit lipophilic properties, are used in food, medicine for pain relief, and self-defense sprays. Capsaicinoids vary in chain length and saturation, with dihydrocapsaicin being a close analog. They are extracted via organic solvents and show antimicrobial and anti-inflammatory effects in research. Solubility favors lipids and alcohols over water, enabling their role in spicy foods and topical formulations.