Omega-3

Omega-3 and Lyme disease: what to know

Omega-3 fatty acids are nutrients involved in cell membranes and many functions throughout the body. The main types discussed in nutrition are ALA, EPA, and DHA.

Omega-3 supplements are not an established treatment for Lyme disease. They should not replace prescribed antibiotics or medical evaluation. This hub explains their nutritional role, the limits of symptom-related claims, and safety considerations.

Can omega-3 supplements help with Lyme symptoms?

Research on omega-3 supplements in other conditions does not establish that they improve fatigue, joint pain, brain fog, or other symptoms associated with Lyme disease.

Some studies have examined omega-3 supplements in rheumatoid arthritis. Rheumatoid arthritis and Lyme arthritis are different conditions, so findings from one should not be presented as proof of benefit for the other.

Persistent joint swelling, pain, or other symptoms deserve an evaluation. A healthcare professional can help identify the cause and discuss appropriate treatment.

Food sources and types of omega-3

ALA is found in plant foods such as flaxseed, chia seeds, walnuts, and certain vegetable oils. EPA and DHA are found in fish and other seafood. Some algae-derived supplements also supply DHA, EPA, or both.

The body can convert some ALA into EPA and DHA, but that conversion is limited. These types of omega-3 are therefore not interchangeable in every nutritional or clinical context.

Understanding supplement labels

Fish oil, krill oil, and algal oil products vary in their composition. Check the amounts of EPA and DHA per serving, rather than relying only on the total amount of oil listed on the front of the package.

For example, the amount described as “fish oil” is not necessarily the same as the combined amount of EPA and DHA. Also check how many capsules make up one serving.

There is no established omega-3 supplement dose for treating Lyme disease. Prescription omega-3 medicines used for specific medical conditions are not interchangeable with over-the-counter supplements.

Safety and medication considerations

Omega-3 supplements can cause unpleasant taste, bad breath, heartburn, nausea, abdominal discomfort, or diarrhea.

Tell your healthcare professional if you take anticoagulants or other medicines that affect bleeding. Do not stop or change prescribed medication to take a supplement.

In the STRENGTH trial, participants at high cardiovascular risk who received 4 grams per day of a prescription EPA/DHA formulation had a higher incidence of atrial fibrillation than those receiving placebo. This finding should not be assumed to apply equally to every omega-3 product or dose. Discuss your heart history and the reason for supplementation with your clinician.

Source: NIH Office of Dietary Supplements — Omega-3 Fatty Acids

If you have a fish or shellfish allergy, ask your clinician or pharmacist about suitable products and check ingredient and allergen information carefully.

Questions to ask before taking omega-3

• What nutritional or medical need would this supplement address?
• Could my symptoms require further evaluation?
• How much EPA and DHA does each serving contain?
• Does it interact with my medicines?
• Does my history of irregular heartbeat affect the decision?
• Would food sources meet my nutritional needs?

Sources and related reading

• NIH Office of Dietary Supplements: Omega-3 Fatty Acids — Consumer Fact Sheet
• NIH Office of Dietary Supplements: Omega-3 Fatty Acids — Health Professional Fact Sheet
• CDC: Treatment and Intervention for Lyme Disease
• Browse the supplement education hub
• Explore joint and muscle symptoms