Omega-6 fatty acids are polyunsaturated fatty acids that humans must obtain from food sources. These fatty acids support brain functioning, hair growth, bone health and metabolism, according to the University of Maryland Medical Center (UMMC).
The American Heart Association recommends consuming between 5 and 10 percent of the daily calorie intake from omega-6 fatty acids. The average American diet contains a sufficient amount of omega-6 fatty acids, according to UMMC. Most people receive their omega-6 fatty acids from vegetable oils.
People who wish to take a supplement containing omega-6 fatty acids should seek medical advice because of possible side effects and drug interactions. For example, omega-6 supplements may interfere with the effectiveness of blood-thinning medications and chemotherapy treatments.