Medically reviewed by Patricia Mikula, PharmD
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- Magnesium, potassium, and sodium are important minerals needed for overall health.
- Magnesium and potassium both support muscle, nerve, and heart health, while sodium is important for fluid balance and blood pressure.
- A healthcare provider can help you decide if you need an electrolyte and, if so, which one is best.
Magnesium, potassium, and sodium are minerals necessary for cellular health, heart health, fluid balance, and more. Your need for each electrolyte may depend on your activity, diet, and additional symptoms. A healthcare provider can test your electrolyte levels with a blood test.
What Are Electrolytes?
Electrolytes are minerals that help your body stay hydrated and support overall health. If you have an electrolyte imbalance, the level of an electrolyte in your body is either too high or too low. This can happen when the amount of water in your body is either too high or too low.
Most people get enough of each electrolyte from eating a nutritious, balanced diet. However, you may need to replace your electrolytes more often if you:
- Are sick, or losing fluids through sweating, vomiting, or diarrhea
- Have a medical condition that affects how well your body absorbs electrolytes and minerals
- Sweat a lot, whether in general or after activity
- Take certain medications that get rid of fluid, like water pills (diuretics), or that affect specific electrolytes
- Are not getting enough nutrients in your diet or have a digestive health condition, such as Crohn's disease or celiac disease, that can disrupt nutrient absorption
- Are not drinking enough fluids, especially during exercise or while in warm environments
Magnesium Is Important for Muscle and Nerve Health
Magnesium plays a role in nearly all body processes. Most importantly, the electrolyte helps with:
- Heart health, including blood pressure control
- Muscle contraction
- Blood glucose (sugar) control
- Cellular energy
- Bone development
- Mood and relaxation
Food sources of magnesium include green leafy vegetables, seeds, nuts, whole grains, and certain beverages.
If you do not get enough magnesium through diet or lose magnesium through an electrolyte imbalance, you may experience the following symptoms:
- Abnormal eye movements (nystagmus)
- Fatigue
- Muscle cramps
- Overall weakness
- Seizures
- Abnormal heart rate
- Numbness and tingling
- Nausea and/or vomiting
- Mood changes
Potassium Is Necessary for Muscle and Heart Health
Potassium is a nutrient needed for general cellular and body health. Overall, the electrolyte helps with:
- Heart health, including heart rate and blood pressure
- Muscle contractions
- Nerve health
- Regulating your overall fluid levels
Potassium is naturally found in foods like apricots, potatoes, chicken, fish, dairy, and nuts.
If you have low potassium levels, you may experience these symptoms:
- Constipation
- Fatigue
- Muscle cramps, twitching, and/or weakness
- Heart palpitations or abnormal heartbeat
- Change in your mood
- Numbness or tingling
Sodium Is Needed for Blood Pressure and Nerve Health
Sodium is a necessary electrolyte that helps maintain fluid levels and hydration in your body. The mineral is also needed for nerve health, blood pressure regulation, and muscle contractions.
Most people in the United States consume more sodium (salt) than they need. Many packaged and processed foods contain high levels of sodium. Without a proper balance of intake and hydration, this can easily affect your overall health.
Signs of low sodium include:
- Headache
- Confusion
- Fatigue
- Nausea and/or vomiting
- Dizziness
- Muscle Cramps
- Seizures
Next Steps
If you think you may have an electrolyte imbalance, talk with a healthcare provider. They can check your levels through a routine blood test.
Certain sports drinks or hydration packs can provide you with additional electrolytes and hydration. If low electrolyte levels are common for you, your doctor may recommend a supplement. Each electrolyte supports your body differently, so it is important to speak with a healthcare provider before starting an electrolyte supplement. In severe cases, you may need to receive electrolytes through fluids or medications given through your vein (IV).
To avoid experiencing an electrolyte imbalance, stay well hydrated and eat a nutritious, balanced diet. Your need for electrolytes and hydration depends on your medical history, any medications you are taking, and whether you are losing fluids (such as through illness or exercise).
