Botany
Aromatic, erect, branched and hairy herb, growing to a height of 0.5 to 1 meter. Leaves are oblong-ovate to ovate, 5 to 11 cm long, with coarse and doubly-toothed margins, a blunt or pointed tip. Flowers are pinkish-purple, crowded and borne in hairy, terminal, axillary spikes, 2 to 8 cm long, 1 cm in diameter, with a corolla 9mm long with obtuse lobes.

Distribution
Found in the Luzon and Visayas provinces, in remote slopes.

Chemical constituents and properties
Leaves yield a volatile oil, 6-10% - Patchouli alcohol, cadinene, coerulein, benzaldehyde and eugenol.
Diuretic, carminative, stimulant, emmenagogue.
The oil may have antibactericidal activity and pogostone may have antibacterial and antifungal activities.
Components eugenol, cinnamaldehyde and benzaldehyde have insecticidal activity.
Important components of the essential oil are patchoulol and norpatchoulenol.
Study on the chemical constituents of an essential oil of PC yielded 22 compounds, 18 sesquiterpenes and three oxygenated sesquiterpenes; among these, patchouli alcohol was the major component, followed by germacrene.

Parts used and preparation
Leaves, flowering spikes, roots.

Uses
Folkloric
Arthritis and rheumatism: Crush leaves and apply on affected part.
Infusion of fresh leaves for painful menses.
Infusion of leaves, dried tops or roots used for scanty urination.
In Malaysia and Japan, has been used as antidote for venomous snake and insect bites.
In traditional Chinese medicine, used for colds, headaches, nausea, vomiting, diarrhea and abdominal pain.
Patchouly oil
Essential oil of patchouli used in perfumes and cosmetics.
Also called: Huo xiang, Putcha-Pat.
Oil also used as ingredient in foods and beverages.
An ingredient of East Asian incense.
Had a surge in the commerce of oil and incense during the free love and hippie decades of the 60s and 70s.
Others
Leaves and tops used as insecticide repellant for cockroaches, moths, ants, etc.
Leaves used with gogo for washing hair.
In some countries, used as ingredient in tobacco smoking.
Juice of leaves used to repel leeches in climbing mountains.
Used as hair conditioner for dreadlocks.

Studies
• ROS-scavenger: Pogostemon cablin as ROS Scavenger in Oxidant-induced Cell Death of Human Neuroglioma Cells: Study suggests the beneficial effects of PC on ROS-induced neuroglial cell injury possibly as a ROS-scavenger.
• Antimutagenic: Antimutagenic Activity of Flavonoids from Pogostemon cablin: Study of methanol extraxct of P cablin showed suppressive effects against furylfuramide, Trp-P-1, and activated Trp-P-1. Test isolated suppressive compounds (7,4'-di-O-methyleriodictyol among others) plus three flavonoids, mobuine, pachypodol and kumatekenin.
• Mosquito Repellent Activity: Study of the mosquito repellent activity of 38 essential oils from plants against Aedes aegypti on human subjects showed the undiluted oil of patchouli, together with citronella, clove and makaen, to be effected in providing 2 hr of complete repellency.
• H Influenza Adhesion Inhibition: Study has shown inhibition of H Influenza on oropharyngeal cells to be inhibited by aqueous extracts of P cablin and A rugosa; a mixture also effective in preventing otitis media and sore throat.
• Anti-Platelet Aggregation: Study isolated a-bulnesene, a sesquiterpened from the water extract of P cablin. It showed a potent and concentration-dependent effect on platelet-activating factor (PAF) and arachidonic acid (AA) induced rabbit platelet aggregation; a first study demonstrating a-blnesene as a PAF-receptor antagonist and anti-platelet aggregation agent.

Safe info
Safe in amounts in foods.
Maximum allowed for food use: 0.0002%.
Animal data shows no toxic effect on short-term use.

Availability
Wild-crafted.