DaVinci Laboratories Olivir 15 is an olive leaf extract supplement for immune system function support. Olivir is the trade name of an olive leaf extract. Olive leaf extract naturally contains bioflavonoids from the antioxidants Rutin and Quercetin. It works against unwanted materials through stimulation of your protective cells to ingest them without suppression of your immune system or causing damage to the body's beneficial flora. Recommended usage: As a dietary supplement, take one tablet, 3 to 4 times daily between meals, or as directed by your healthcare practitioner. If detoxification symptoms occur, reduce daily dosage.