Cucurbita foetidissima, a vine with a rank odor, native to southwest North America. Butternut squash seed oil, from the seeds of Cucurbita moschata, has a nutty flavor that is used for salad dressings, marinades, and sautéeing. Egusi seed oil, from the seeds of Cucumeropsis mannii naudin, is particularly rich in linoleic acid. Pumpkin seed oil, a specialty cooking oil, produced in Austria, Slovenia and Croatia. Used mostly in salad dressings. Watermelon seed oil, pressed from the seeds of Citrullus vulgaris. Traditionally used in cooking in West Africa. Food supplements A number of oils are used as food supplements (or "nutraceuticals"), for their nutrient content or purported medicinal effect. Borage seed oil, blackcurrant seed oil, and evening primrose oil all have a significant amount of gamma-Linolenic acid (GLA) (about 23%, 15–20% and 7–10%, respectively), and it is this that has drawn the interest of researchers. Açaí oil, from the fruit of several species of the Açaí palm (Euterpe) grown in the Amazon region. Black seed oil, pressed from Nigella sativa seeds, has a long history of medicinal use, including in ancient Greek, Asian, and Islamic medicine, as well as being a topic of current medical research. Blackcurrant seed oil, from the seeds of Ribes nigrum, used as a food supplement. High in gamma-Linolenic, omega-3 and omega-6 fatty acids. Borage seed oil, from the seeds of Borago officinalis. Evening primrose oil, from the seeds of Oenothera biennis, the most important plant source of gamma-Linolenic acid, particularly because it does not contain alpha-Linolenic acid. Flaxseed oil (called linseed oil when used as a drying oil), from the seeds of Linum usitatissimum. High in omega-3 and lignans, which can be used medicinally. A good dietary equivalent to fish oil. Easily turns rancid. Other edible oils Amaranth oil, from the seeds of grain amaranth species, including Amaranthus cruentus and Amaranthus hypochondriacus, high in squalene and unsaturated fatty acids. Apricot oil, similar to almond oil, which it resembles. Used in cosmetics. Apple seed oil, high in linoleic acid. Argan oil, from the seeds of the Argania spinosa, is a food oil from Morocco developed through a women's cooperative founded in the 1990s, that has also attracted recent attention in Europe. Avocado oil, an edible oil used primarily in the cosmetics and pharmaceutical industries. Unusually high smoke point of . Babassu oil, from the seeds of the Attalea speciosa, is similar to, and used as a substitute