Chamomile Oil, Roman (Chamaemelum nobile)

Roman chamomile oil (Chamaemelum nobile) is a volatile essential oil, not a nutritional food source, and therefore contains no meaningful macronutrients (no protein, carbohydrates, fat, or fiber in therapeutic doses). Its value lies entirely in its bioactive volatile compounds. Key constituents include: Esters — angelic acid esters (isobutyl angelate ~25-30%, isoamyl angelate ~15-20%, 2-methylbutyl angelate ~10-15%) which account for the oil's characteristic calming properties; Monoterpenes — α-pinene (~2-5%), β-pinene (~1-3%), camphene (~1-2%); Sesquiterpenes — trans-β-caryophyllene (~1-3%); Ketones — pinocarvone (~2-5%); Chamazulene — present in trace amounts (~0.1-0.5%), a potent anti-inflammatory sesquiterpene formed during distillation; Bisabolol — trace to ~1%, with anti-inflammatory and skin-soothing activity; 1,8-Cineole (eucalyptol) — trace amounts (~0.5-2%). The oil also contains flavonoid precursors including apigenin derivatives and nobilin (a sesquiterpene lactone unique to C. nobile). Total ester content typically ranges from 60-80% of the oil composition, distinguishing Roman chamomile from German chamomile. Bioavailability is primarily achieved through dermal absorption (topical application with carrier oil allows ~10-15% percutaneous absorption of terpenes within 20 minutes) and inhalation (volatile compounds cross the blood-brain barrier rapidly via olfactory pathways within seconds to minutes). Oral bioavailability of terpenoid constituents is moderate but varies; angelic acid esters are hydrolyzed in the GI tract. The oil contains no vitamins or minerals in physiologically relevant amounts. Typical therapeutic dose is 1-3 drops (approximately 25-75 mg) diluted in a carrier oil for topical use or diffused for aromatherapy.