NOW Foods Cinnamon Bark Essential Oil is a 100% pure essential oil steam-distilled from Cinnamomum zeylanicum bark — the true Ceylon cinnamon, providing a rich, warm, sweet-spicy aroma and a high cinnamaldehyde content that is responsible for both its characteristic scent and its potent antimicrobial properties. Cinnamon bark oil is one of the most powerful antimicrobial essential oils available, with broad-spectrum activity against bacteria, fungi, and viruses demonstrated in research. In aromatherapy it is warming, stimulating, and emotionally energizing — lifting mood and combating mental fatigue. It is a key component in immunity-supporting oil blends. NOW Foods tests via GC/MS to verify cinnamaldehyde content. Important: Cinnamon bark oil is highly potent and a known sensitizer — dilute extremely well in carrier oil (1% maximum), avoid during pregnancy, and keep away from skin without heavy dilution.