Vitamins F, an essential fatty acid, is composed of two fatty acids—linoleic acid (LA) and alpha-linoleic acid (LNA)—with linoleic acid being the most complete fatty acid. There are two basic categories of EFA's (essential fatty acids)—omega-3 and omega-6—which include linoleic acid and gamma-linoleic acid. The body is not capable of manufacturing essential fatty acids, while the fatty acid arachidonic acid can be synthesized in the body from linoleic acid.

Fatty acids are needed for normal growth and behavior and help with healthy cell membranes, a well balanced hormone level and properly working immune system.

They are essential for the synthesis of tissue lipids, play an important role in the regulation of cholesterol levels, and are precursors of prostaglandins, hormone like compounds producing various metabolic effects in tissues.

To the skin, it brings suppleness and a youthful appearance and hair becomes more shiny and healthy when in good supply. It also seems important in the manufacture of sex and adrenal hormones. Fatty acids also stimulate the growth of the beneficial intestinal bacteria. Edema has also been reported with fatty acids in short supply.

Arthritis is said to benefit from these fatty acids and they also aid in the transmission of nerve impulses and a shortage may lead to learning disabilities and a problem with recalling information.

Hair loss and eczema may be indicated when deficient in Vitamin F and may cause damage to the kidneys, heart and liver. Behavioral disturbances are also noted when deficient. The immune system can become less efficient with resultant slow healing and susceptibility to infections. Tear glands can also not work effectively and may dry up. Blood pressure and cholesterol levels may be higher when deficient and blood more likely to form clots.

People who are overweight, have dry eyes, bruise easily and have frequent infections may consider increasing their intake as well as those on a low fat diet or with a dry skin, dandruff or brittle nails.

Fatty acids are available in evening primrose oil, grape seed oil, flaxseed oil, and oils of grains, nuts and seeds, such as soybean, walnuts, sesame, and sunflower. Also present in avocados, as well as meat and fish like salmon, trout, mackerel and tuna. Omega-6 EFA is found in raw nuts, seeds, legumes, grape seed oil and flaxseed oil. Omega-3 EFA is found in fish, canola oil, and walnut oil.

When buying a supplement of fatty acids, make sure they are in balanced quantities. But please remember that these oils are unstable. Heat and light must be excluded when extracting these oils and must be stored away from light. If fatty acid oils are hydrogenated, as in the manufacture of margarine, the linoleic acid is converted into trans-fatty acids which are not beneficial to the body.