Fish oil and magnesium have a number of health benefits. Taking fish oil supplements can help reduce your triglycerides, facilitate inflammation and pain and reduce blood pressure. Magnesium supplements can also help reduce your blood pressure, as well as to manage your calcium levels and prevent the blood vessels hardening.
Because these supplements have overlapping effects, it is important to speak with your doctor before taking both together. Taking them at the same time can lead to too good, like lowering your blood pressure too low and uncomfortable.
How do fish oil and magnesium interact?
Fish oil can help lower your triglycerides and start eliminating your arteries, reducing your blood pressure, according to Mayo Clinic. Magnesium is considered to be a blocker of natural calcium channels, which means that it prevents calcium from accumulating in your arteries. In fact, this can help your arteries relax and open and potentially lower your blood pressure.
Taking supplements of fish and magnesium oil at the same time can further reduce your blood pressure. The low blood pressure can make you feel dizzy, stunning, weak and even confused, explains the Cleveland clinic.
For this reason, it is important to speak with your doctor potential interactions between fish oil and magnesium supplements before taking them at the same time. You may be able to space them during the day instead.
Overall, the risk of interaction between fish oil and magnesium is more theoretical, as fish oil and magnesium by themselves are known to slightly lower blood pressure. In fact, various drug interaction auditors, as well as Mayo Clinic and the National Institutes of Health (NIH), for example, do not list both as having possible interaction.
But if you already have low blood pressure, it is better to speak with your doctor before starting, and especially if you plan to take them together.
The advantages of fish oil
Omega-3 fatty acids are healthy fats found in fish such as salmon and mackerel, as well as fish oil supplements. They are not produced by your body, but they are important for various bodily processes, such as helping your cells to develop and operate your muscles, as well as to reduce blood pressure, explains Mayo Clinic. They can also play an important role in:
- Lower triglycerides and cholesterol levels: Omega-3 fatty acids in fish oil can considerably reduce the levels of fatty substances called triglycerides in your blood, explains Mayo Clinic. These substances obstruct your arteries over time, forming a hard plaque that makes your heart more difficult for the blood to flow through your blood vessels. Omega-3 fatty acids can also reduce LDL cholesterol levels (“bad”) while improving HDL cholesterol (“good”).
- Reduction of arterial plaque: Fish oil can help eliminate the plate that forms in your arteries and can prevent it from forming, according to research published in 2020. This allows blood to flow more easily throughout your body.
- According to inflammation: Fish oil can help reduce pain associated with inflammation in your joints, explains the foundation of arthritis. It can also help you feel less painful and steep in the morning and further reduce the need for anti-inflammatory drugs, Mayo Clinic explains.
- Improve mood: Research published in 2023 suggests that omega-3s, which are in fish oil, can reduce the symptoms of depression.
Fish oil is generally safe to take, and all the side effects you may experience are soft and temporary, according to Mayo Clinic. These side effects may include a taste similar to fish in the mouth, belching and nausea.
It is also possible for fish oil to interact with other drugs, including anticoagulant drugs and blood pressure, so it is important to speak with your doctor before taking it as a supplement.
The advantages of magnesium
Magnesium has a number of health benefits, according to the Cleveland Clinic. It can support healthy digestion, facilitate stress and anxiety and relieve sore and painful muscles. He also plays a role in:
- Improve heart rate: Magnesium helps your heart regularly beating, explains Keck medicine from the USC. Too low levels can contribute to irregular heartbeat.
- Reduce the risk of heart events: Research published in 2025 suggests that magnesium supplements can reduce the risk of heart failure and major heart events, such as heart attack and brain vascular accidents in people with diabetes.
- Lower blood pressure: Calcium can affect the way your heart is beating and can contribute to high blood pressure. It can accumulate in your arteries, contributing to calcification or hardening in your blood vessels, explains the British Heart Foundation. The increase in your magnesium consumption can help prevent this hardening, which is a predictor of the heart attack or stroke, according to research published in 2022. Magnesium acts as a blocking of natural calcium channels or an antihypertensive drug.
Although magnesium supplements are considered safe, you may experience light side effects, such as nausea or light diarrhea when they are taken, according to Harvard Health Publishing. Obtaining magnesium thanks to food sources – such as spinach and other leaves with leaves, legumes, nuts and whole grains – does not cause these side effects, however, the office of food supplements.
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