Fish oil has been heralded as a boon to heart health, due to its high content of omega-3 fatty acids. Supplements created from the oils of fish like mackerel, tuna and salmon provide a convenient way for those who don't like the taste of fish to get more omega-3 in their diets. Unfortunately, the same qualities that make fish oil desirable can cause problems for some users. This is the case for individuals with disorders that predispose them to excessive bleeding.
Fish Oil and Coagulation
Fish oil has a blood-thinning effect that can cause problems for those who are prone to bruising. According to the University of Maryland Medical Center, fish oil prevents blood platelets from clumping, thus inhibiting the formation of blood clots and increasing bleeding time. In some cases, the inhibition of clot formation is a positive effect. MedlinePlus states that fish oil may help prevent clots from blocking grafts in kidney dialysis patients and that its anti-clotting aspect may prove useful in a number of cardiovascular disorders.
Fish Oil and Hemophilia
In some cases, the tendency of fish oil to reduce clotting causes more problems than it solves. If you have the inherited condition known as hemophilia, your deficiency in certain clotting factors already makes the process of wound healing difficult. Hemophiliacs often bleed for lengthy periods of time following an injury and are susceptible to internal bleeding as well. UMMC states that you should avoid fish oil if you have hemophilia.
Anti-Coagulant Drugs
If you're already taking medications aimed at reducing your risk of blood clots, you should consult your doctor before taking fish oil. MedlinePlus states that drugs such as aspirin, warfarin and heparin fall into this category. Some herbs may also slow blood clotting and may cause interactions with fish oil. These include ginger, garlic, turmeric, willow and clove, among others.
Dosages
If you have no history of heart disease, eating fish twice per week may be enough to fulfill your need for omega-3 fatty acids. For those with specific needs, supplements may provide a convenient method of consuming your allotment of this nutrient. Consult your doctor to determine the dosage that's right for you. The recommended dosages of fish oil vary according to what health issue you are trying to address, but you should not take over 3 g of fish oil per day without a doctor's supervision, as this may increase your risk of bleeding.
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