Argan oil is an oil produced from the kernels of the argan tree, endemic to Morocco, that is valued for its nutritive, cosmetic and numerous medicinal properties. The tree, a relict species from the Tertiary age, is extremely well adapted to drought and other environmentally difficult conditions of southwestern Morocco. The species Argania once covered North Africa and is now endangered and under protection of UNESCO. The Argan tree grows wild in semi-desert soil, its deep root system helping to protect against soil erosion and the northern advance of the Sahara. This biosphere reserve, the Arganeraie Biosphere Reserve, covers a vast intramontane plain of more than 2,560,000 hectares, bordered by the High Atlas and Anti-Atlas Mountains and open to the Atlantic in the west. Argan oil remains one of the rarest oils in the world due the small and very specific growing areas.

For centuries before modern times, the Berbers (indigenous people of Morocco) of this area would collect undigested argan pits from the waste of goats which climb the trees to eat their fruit. The pits were then ground and pressed to make the nutty oil used in cooking and cosmetics. However, the oil used in cosmetic and culinary products available for sale today has most likely been harvested and processed with machines in a verifiably clean and sanitary way.

The oil was sold in Moroccan markets even before the Phoenicians arrived, yet the hardy argan tree has been slowly disappearing. Overgrazing by goats and a growing, wood-hungry local population have whittled the number of surviving trees down to less than half of what it was 50 years ago.

The tree is a relic of the Earth's Tertiary Period, which ended about 1.6 million years ago, and it grows in only a few other places in the world. It is tenacious, withering and fruitless during extended droughts, and it lives as long as 200 years. So there was alarm that the Argania spinosa, as the tree is properly called, was headed for extinction, along with its precious goat-related oil.

UNESCO, and enthusiasts excited by the oil's reputed anti-aging qualities have helped by creating a global market for the exotic oil, the unlikely alliance hopes to raise awareness about the inherent value of the trees, encouraging more careful grazing and stopping the local population from chopping the trees down for firewood. The people in the area are poor, as they now understand the value of the tree, they are protecting it.

UNESCO declared a 25,900-square-kilometer of land between the Atlantic and the Atlas Mountains a reserve and provided money to manage the trees' preservation. Chefs and society matrons took up the cause, praising the culinary qualities of the oil and its anti-aging effect on the skin. There is also a ban against grazing in the trees from May to August, when the fruit ripens to a bright yellow and eventually the goats climb the trees, eat the fruit and expel the pits, which locals continue to collect.

At the Cooperative in Tiout, Berber women sit on the floor with rough rectangular stones between their knees cracking pits with rounded rocks. Each smooth pit contains one to three kernels, which look like sliced almonds and are rich in oil. The kernels are then removed and gently roasted. This roasting accounts for part of the oil's distinctive, nutty flavour. It takes several days and about 32 kilograms of fruit - roughly one season's produce from a single tree - to make only one liter of oil. The cosmetic oil, rich in vitamin E and essential fatty acids, is used for massage, facials and as an ingredient in anti-aging cream. The edible oil is extracted from roasted kernels.