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They are generally labeled as some sort of Fish Oil. Look at the ingredient list for EPA & DHA
EPA (Eicosapentaenoic acid)
Eicosapentaenoic acid (EPA) is one of several omega-3 fatty acids used by the body. Our main dietary sources of EPA are cold water fish
DHA (Docosahexaenoic acid)
Docosahexaenoic acid (DHA) is an omega-3 fatty acid that is essential for the proper functioning of our brains as adults. Lack of sufficient DHA may be associated with impaired mental and visual functioning as well as attention-deficit hyperactivity disorder (ADHD) in children. Low levels have also been associated with depression and Alzheimer's disease in adults.
There are good fats and there are bad fats. Artificially produced trans-fatty acids are bad in any amount and saturated fats from animal products should be kept to a minimum. The best fats (oils) are those that contain the essential fatty acids so named because without them we die. Essential fatty acids (EFAs) are polyunsaturated and grouped into two families, the omega-6 EFAs and the omega-3 EFAs.
Omega 3 & Omega 6 - Seemingly minor differences in their molecular structure make the two EFA families act very differently in the body. While the metabolic products of omega-6 acids promote inflammation, blood clotting, and tumor growth, the omega-3 acids act entirely opposite. Although we do need both omega-3s and omega-6s it is becoming increasingly clear that an excess of omega-6 fatty acids is not desirable. Many scientists believe that a major reason for the high incidence of heart disease, hypertension, diabetes, obesity, premature aging, and some forms of cancer is the profound imbalance between our intake of omega-6 and omega-3 fatty acids. Our ancestors evolved on a diet with a ratio of omega-6 to omega-3 of about 1:1. The change in dietary habits over the last few centuries has changed this ratio to something closer to 20:1
The main sources of omega-6 fatty acids are vegetable oils such as corn oil and soy oil that contain a high proportion of linoleic acid. Omega-3 acids are found in flaxseed oil, walnut oil, and marine plankton and fatty fish. The main component of flaxseed and walnut oils is alpha-linolenic acid (ALA) while the predominant fatty acids found in fatty fish and fish oils are eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). The most beneficial and active of these fatty acids are EPA and DHA. Alpha-linolenic acid can be converted to EPA and DHA in the body, but the conversion is quite inefficient.

Omega-3 fatty acids fall into two major categories: Plant derived (flax seed oil, yielding alpha linolenic acid or ALA) or marine derived (fish oil, yielding both EPA and DHA). The human conversion of ALA to EPA and DHA is inefficient and can be inhibited by various conditions such as a diet high in linoleic acid (Omega-6), trans-fatty acids such as fast foods and baked goods, alcohol intake, certain health conditions, and vitamin and mineral deficiencies (B3, B6, C, zinc, magnesium). Fish, on the other hand, is a direct source of EPA and DHA . The general consensus is that only about 15% of ALA converts to EPA, and it may not convert to DHA at all. And, no, Flax seed oil does not contain A or D. If you choose to supplement with flax, use the oil with lignans for the added fiber benefit or use ground flax seeds. Whole flax seeds do little more than add fiber since they basically pass through the digestive system unchanged.


My first question would be; why are you taking it? I am not aware of any potential harm, however, you may be wasting your money. Evening primrose oil is a source not only of linoleic acid but also of another kind of fatty acid called gamo-lenic acid (also known as gamma linolenic acid, or GLA). This fatty acid, normally manufactured by the body from linoleic acid, is important in many ways. It is transformed by the body eventually into eicosanoids, hormone-like chemicals that include the prostaglandins. The latter control such processes as inflammation, blood clotting, and cholesterol synthesis.
Since the body produces its own GLA, why consume it in evening primrose oil? Consuming oatmeal (especially the less processed stuff such as steel-cut) also increases GLA in the body.