Tamanu oil possesses a unique capacity to promote the formation of new tissue, thereby accelerating wound healing and the growth of healthy skin. This process is known as cicatrization. For this reason, it is a widely used traditional topical aid. In Pacific island folk medicine, tamanu oil is applied liberally to cuts, scrapes, burns, insect bites and stings, abrasions, acne and acne scars, psoriasis, diabetic sores, anal fissures, sunburn, dry or scaly skin, blisters, eczema, herpes sores, and to reduce foot and body odor. Tamanu oil is also massaged into the skin to relieve neuralgia, rheumatism and sciatica. Tamanu oil is employed by Polynesian women for promoting healthy, clear, blemish-free skin, and is also used on babies to prevent diaper rash and skin eruptions.
Tamanu and Its Dispersal
Calophyllum inophyllum is indigenous to Southeast Asia, but is profuse in Polynesia. The tree grows up to 25 or even 30 meters in height, with long, spreading limbs. The tree trunk is typically thick with dark, cracked bark. The tamanu branches are covered with shiny, dark green oval leaves, and small white flowers with yellow centres. The blossoms give off a delightful, sweet perfume. The fruit of the tree, about the size of an apricot, has a thin flesh and a large nut hull inside. Yet the tamanu nut is a botanical oddity. When the fruits of the tree are collected and cracked open, the blond nut kernel inside contains no apparent oil. But when the kernel dries on a rack for a month or so, it turns a deep, chocolate brown, and becomes sticky with a rich, pleasant-smelling oil. Using a simple screw press, the oil is squeezed from the dark kernels. The resulting oil of tamanu is dark green and luxurious. Though oil of tamanu is thick and rich, once it is applied to skin it is readily and completely absorbed, leaving no oily residue.
Anti-Neuralgic and Skin Healing Activity
Traditionally oil of tamanu has enjoyed topical use in Fiji for relieving the pain of sciatica, shingles, neuralgia, rheumatism and leprous neuritis, for which it is effective. In 1918, researchers associated with the French Pharmacopoeia began research into tamanu for topical and subcutaneous use. The French researchers quickly became impressed by tamanu’s cicatrizing properties. In the French medical literature on tamanu oil, several instances of its successful use in cases of severe skin conditions have been reported. In one remarkable instance, a woman was admitted to the St. Louis Hospital in Paris with a large gangrenous ulcer on her leg which would not heal. Though doctors were sure that amputation was inevitable, she was given regular dressings of tamanu oil. The wound healed completely, leaving a smooth, flat scar. In other cases, tamanu oil has been employed successfully to heal severe burns caused by boiling water, chemicals and X-rays.
Novel Constituents in Tamanu Oil
Oil of tamanu contains three basic classes of lipids, neutral lipids, glycolipids, and phospholipids. The oil also contains a unique fatty acid called calophyllic acid, and a novel antibiotic lactone and non-steroidal anti-inflammatory agent called calophyllolide. These and other components of tamanu oil, including anti-inflammatory coumarins, account for some of the oil’s beneficial activity. Based on the known activity of known constituents, it is clear that oil of tamanu possesses antibacterial and anti-inflammatory activities. The unique cicatrizing properties of tamanu oil are not yet explained in existing scientific literature, though this activity is established and accepted. The same is true for tamanu’s anti-neuralgic properties. Tamanu oil is well documented for its relief of neuritis, but the constituents responsible and their modes of activity are not yet known.
