Fish oil, an excellent source of critical omega-3 fatty acids, is a popular supplement that is generally regarded as safe by the U.S. Food and Drug administration and other governing bodies. According to the U.S. National Institutes of Health and medical information website drugs.com, fish oil has no universal contraindications. However, practitioners may recommend people with certain medical conditions avoid fish oil or take it only in moderation.
Bleeding Disorders
Fish oil is a mild anticoagulant and may slightly reduce levels of the von Willebrand factor, an important component of the clotting process. In theory, excessive fish oil intake may be dangerous for people with bleeding disorders like hemophilia or von Willebrand disease.
Diabetes
According to the National Institutes of Health, fish oil is generally safe for people with diabetes and may offer some benefits. However, because fish oil may slightly reduce insulin levels, people with diabetes may experience hypoglycemia (a drop in blood sugar) after taking fish oil with oral diabetes medication.
Anticoagulants
People taking blood thinners like warfarin should take fish oil only under a physician's guidance. In theory, fish oil can interact with anticoagulant drugs and increase the likelihood of hemorrhage.
Pregnancy and Breast-Feeding
The U.S. National Institutes of Health notes fish oil supplements are generally safe for women who are pregnant and nursing; several studies indicate these supplements offer several benefits during this stage of life. However, extremely large doses of fish oil could theoretically increase the risk of bleeding during pregnancy.
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