Best Magnesium Potassium Supplements

Maintaining optimal levels of magnesium and potassium is essential for your body to function at its best. These two minerals play critical roles in hundreds of biological processes, from maintaining a steady heartbeat to ensuring your muscles contract and relax properly. Unfortunately, many Americans don’t get enough of either mineral through diet alone, making supplementation an important consideration for overall health and wellness.

We’ve carefully evaluated the top magnesium potassium supplements on the market, considering factors like bioavailability, ingredient quality, third-party testing, and user reviews. Whether you’re looking to support cardiovascular health, improve athletic performance, or simply fill nutritional gaps, this guide will help you find the perfect supplement for your needs.

Our Top Picks at a Glance

• Best Overall: Magnesium Glycinate Gummies 400mg — High absorption and great taste
• Best Value: Magnesium Potassium Zinc Supplement — Three essential minerals in one
• Best Premium: Integrative Therapeutics Krebs Complex — Professional-grade heart health support

Quick Comparison

Product	Key Ingredients	Form	Servings	Best For
Magnesium Glycinate Gummies	Magnesium 400mg, Potassium	Gummies	30	Overall health
Mag Potassium Zinc	Mag 375mg, Potassium 450mg, Zinc	Capsules	45	Budget-conscious
Integrative Therapeutics	Mag 250mg, Potassium 80mg	Tablets	60	Heart support
Life Extension Extended-Release	Magnesium, Potassium	Capsules	60	Sustained delivery
Pure Encapsulations Citrate	Magnesium, Potassium citrate	Capsules	90	High absorption

1. Magnesium Glycinate Gummies 400mg with Potassium — Best Overall

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These gummies deliver highly absorbable magnesium glycinate paired with potassium in a format that actually tastes good.

Unlike many mineral supplements that can be harsh on the digestive system, the magnesium glycinate form in these gummies is gentle and highly bioavailable. Each gummy provides essential minerals to support muscle relaxation, nerve function, and cardiovascular health. The pleasant taste eliminates the common struggle of remembering to take your supplements daily.

What We Like

• Superior absorption with glycinate form
• Great-tasting berry flavor
• Gentle on sensitive stomachs
• No artificial ingredients

What Could Be Better

• Higher cost per dose than capsules
• Contains natural sugars

Bottom Line: The combination of effectiveness, taste, and gentle absorption makes these gummies our top choice for daily magnesium potassium supplementation.

2. Magnesium Potassium Supplements with Zinc 90 Capsules — Best Value

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Get three vital minerals in one comprehensive supplement at an unbeatable price point.

This formula doesn’t make you choose between minerals. With 375mg magnesium, 450mg potassium, and 50mg zinc, you’re getting comprehensive mineral support in every serving. The addition of zinc boosts immune function while the magnesium and potassium work on cardiovascular and muscle health. The vegan-friendly capsules make this accessible to everyone.

What We Like

• Outstanding value with three minerals
• High potassium content
• Vegan and non-GMO
• Supports multiple body systems

What Could Be Better

• Two-capsule serving size
• Best taken with meals

Bottom Line: An exceptional value that delivers comprehensive mineral support without compromising on quality or effectiveness.

3. Integrative Therapeutics Krebs Magnesium Potassium Complex — Best Premium

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A professional-grade formula trusted by healthcare practitioners for cardiovascular support.

Integrative Therapeutics has built its reputation on science-backed formulations, and this Krebs cycle complex exemplifies that commitment. The minerals are bound to Krebs cycle intermediates for enhanced absorption and cellular energy production. This isn’t just about supplementing minerals; it’s about optimizing how your body uses them at the cellular level.

What We Like

• Clinically formulated for heart health
• Krebs cycle minerals for superior utilization
• Free from common allergens
• Recommended by healthcare professionals

What Could Be Better

• Premium price point
• Tablet format may be difficult for some

Bottom Line: Worth the investment for those prioritizing cardiovascular health and seeking a professional-grade formulation.

4. Life Extension Potassium with Extend-Release Magnesium — Best Technology

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Advanced extended-release technology ensures steady mineral levels throughout the day.

Life Extension’s innovative delivery system releases magnesium gradually over several hours, maintaining consistent blood levels and minimizing digestive discomfort. This sustained release mimics how you’d absorb minerals from food throughout the day, providing more physiological supplementation. The combination of immediate-release potassium with extended-release magnesium offers the best of both worlds.

What We Like

• Patented extended-release technology
• Reduces digestive side effects
• Maintains steady blood levels
• Backed by extensive research

What Could Be Better

• Higher price than basic formulas
• Requires consistent timing for best results

Bottom Line: The extended-release technology makes this ideal for those who’ve experienced digestive issues with other magnesium supplements.

5. Pure Encapsulations Potassium Magnesium (Citrate) — Best for Absorption

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Hypoallergenic formula using the most bioavailable citrate forms of both minerals.

Pure Encapsulations is the gold standard for clean, effective supplements. Their potassium magnesium citrate formula uses highly absorbable forms that your body can readily utilize. Free from unnecessary additives and common allergens, this supplement is ideal for those with sensitivities or who simply want the purest mineral supplementation available.

What We Like

• Highly bioavailable citrate forms
• Hypoallergenic and clean formula
• Third-party tested for purity
• Supports bone and cardiovascular health

What Could Be Better

• Multiple capsules per serving
• Premium pricing

Bottom Line: The purest, most hypoallergenic option for those with sensitivities or who demand the highest quality supplements.

6. Magnesium Glycinate with Potassium Sleep Support — Best for Sleep

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Specifically formulated to promote relaxation and restful sleep while providing essential minerals.

This targeted formula leverages magnesium glycinate’s natural calming properties to help you unwind at bedtime. The potassium content helps prevent those annoying leg cramps that wake you up at night. Users consistently report falling asleep faster and waking up feeling more refreshed when taking these gummies consistently before bed.

What We Like

• Promotes natural relaxation
• Prevents nighttime leg cramps
• Pleasant taste encourages compliance
• Non-habit forming sleep support

What Could Be Better

• Best taken only in the evening
• May take several days to notice effects

Bottom Line: Perfect for anyone seeking natural sleep support combined with essential mineral supplementation.

7. Magnesium Potassium Supplement for Leg Cramps — Best for Athletes

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Formulated specifically to address exercise-induced muscle cramps and support athletic recovery.

Athletes lose significant amounts of minerals through sweat, making supplementation essential for optimal performance. This formula provides the ideal balance of magnesium and potassium to prevent cramping during and after exercise. The fast-absorbing gummies can be taken before workouts to prevent cramps or after to aid recovery.

What We Like

• Designed for active lifestyles
• Prevents exercise-induced cramping
• Fast absorption for quick results
• Convenient pre or post-workout

What Could Be Better

• Heavy training may require additional supplementation
• Gummies can soften in heat

Bottom Line: Athletes will appreciate this targeted approach to preventing cramps and supporting peak performance.

8. NOW Supplements Potassium Citrate & Magnesium Citrate — Best Budget

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Quality supplementation at an incredibly affordable price from a trusted brand.

NOW Foods proves that effective supplements don’t have to be expensive. This straightforward combination of magnesium citrate and potassium citrate delivers essential mineral support without fancy marketing or inflated prices. The GMP-certified formula ensures quality, while the large bottle size means you won’t run out quickly.

What We Like

• Exceptional price per serving
• GMP quality certified
• Simple, effective formula
• Large bottle lasts longer

What Could Be Better

• No additional beneficial ingredients
• Larger capsule size

Bottom Line: A reliable, no-nonsense option that delivers solid mineral supplementation without breaking your budget.

How to Choose the Right Magnesium Potassium Supplement

Understanding the different forms of magnesium and potassium is crucial for making an informed choice. Magnesium comes in multiple forms including glycinate, citrate, malate, and oxide. Glycinate is often considered the best for overall supplementation because it’s highly absorbable and gentle on the stomach. Citrate is also well-absorbed and can help with constipation. Avoid magnesium oxide, which is poorly absorbed despite being commonly used in inexpensive supplements. For potassium, citrate and chloride forms are most common in supplements and both absorb well.

The quality and purity of your supplement matter tremendously. Look for products that undergo third-party testing by organizations like NSF International, USP, or ConsumerLab. These independent verifications confirm that the supplement contains what it claims and is free from harmful contaminants like heavy metals. Reputable brands will proudly display these certifications on their labels and websites. Be wary of supplements that make unrealistic claims or lack transparency about testing.

Your specific health goals should guide your selection. If muscle cramps are your primary concern, prioritize supplements with higher potassium content and consider timing them around your workouts. For cardiovascular support, look for formulas specifically designed for heart health, often containing balanced ratios of both minerals. Those struggling with sleep might benefit from evening doses of magnesium glycinate. Consider whether you need just these two minerals or would benefit from a more comprehensive formula including other synergistic nutrients.

Dosage considerations require careful attention. Most adults need 310-420mg of magnesium daily depending on age and gender. Potassium needs are much higher at 2,600-3,400mg daily, but FDA regulations limit over-the-counter supplements to 99mg per serving. You should get most of your potassium from food sources like bananas, potatoes, and leafy greens. Never exceed recommended doses, especially for potassium, as too much can be dangerous for people with kidney problems or those taking certain medications.

The delivery method affects both compliance and absorption. Gummies taste better and are easier to take, making them ideal if you struggle with pill-swallowing or forget to take supplements. However, they’re more expensive and may contain added sugars. Capsules and tablets are more economical and have longer shelf lives but can be harder to swallow. Powders allow flexible dosing and can be mixed into drinks, though some people dislike the taste. Choose the format you’ll actually use consistently, as regular supplementation produces the best results.

Benefits of Magnesium Potassium Supplementation

Cardiovascular health receives substantial benefits from adequate magnesium and potassium intake. Both minerals help regulate blood pressure through different mechanisms. Magnesium relaxes blood vessel walls and reduces vascular resistance, while potassium helps your body excrete excess sodium that can contribute to high blood pressure. Together, they create a powerful combination for maintaining healthy blood pressure levels already within normal range. Research consistently shows that people with higher intakes of both minerals tend to have better cardiovascular health outcomes.

Muscle function and cramp prevention improve dramatically with proper magnesium and potassium levels. These minerals are essential for the contraction and relaxation cycles that allow muscles to work properly. Magnesium acts as a natural calcium blocker, helping muscles relax after contraction. Potassium maintains proper fluid balance within muscle cells, preventing the dehydration that can trigger cramps. Athletes, pregnant women, and older adults particularly benefit from supplementation to prevent uncomfortable and sometimes painful muscle cramps.

Energy production at the cellular level depends heavily on adequate magnesium. This mineral is a cofactor in over 300 enzymatic reactions, many of which involve energy production. Magnesium is required for the synthesis and use of ATP, the molecule that serves as your body’s energy currency. Potassium maintains the electrical gradients across cell membranes that power numerous cellular processes. Many people who supplement with both minerals report feeling more energetic and less fatigued, particularly if they were deficient.

Bone health benefits extend beyond the well-known calcium and vitamin D. Magnesium plays a crucial role in bone formation and affects the activities of osteoblasts and osteoclasts, the cells responsible for building and breaking down bone. It also influences the concentrations of parathyroid hormone and vitamin D, both important for bone health. Potassium helps preserve calcium in bones by reducing urinary calcium loss, potentially reducing osteoporosis risk. Together, these minerals contribute to maintaining strong, healthy bones throughout life.

Frequently Asked Questions

Is it safe to take magnesium and potassium supplements together?

Taking magnesium and potassium together is generally safe and often recommended, as these minerals work synergistically in your body. However, people with kidney disease should consult their doctor before taking either supplement, as impaired kidney function can lead to dangerous accumulation of potassium. If you’re taking medications, especially diuretics, ACE inhibitors, or heart medications, talk to your healthcare provider before supplementing.

How long does it take to see results from magnesium potassium supplements?

The timeline varies depending on your starting levels and what benefits you’re seeking. Some people notice improvements in muscle cramps within a few days, while sleep quality and energy levels typically improve within one to two weeks of consistent supplementation. Cardiovascular benefits may take several weeks to months to become apparent. For best results, take your supplement consistently and give it at least 30 days before evaluating effectiveness.

Can magnesium potassium supplements help with high blood pressure?

These supplements can support healthy blood pressure levels, but they’re not replacements for prescribed blood pressure medications. Research shows that adequate magnesium and potassium intake contributes to blood pressure management, particularly in people with hypertension. However, they should be part of a comprehensive approach including diet, exercise, stress management, and any medications prescribed by your doctor. Never stop taking prescribed blood pressure medication without medical supervision.

What are the symptoms of magnesium and potassium deficiency?

Magnesium deficiency symptoms include muscle cramps, tremors, fatigue, weakness, irregular heartbeat, and difficulty sleeping. You might also experience anxiety, irritability, or migraine headaches. Potassium deficiency symptoms include muscle weakness, cramping, constipation, fatigue, and heart palpitations. Severe deficiencies can cause serious heart problems. If you suspect deficiency, get blood work done rather than self-diagnosing, as symptoms overlap with many other conditions.

Should I take magnesium potassium supplements with food?

Taking these supplements with food is generally recommended to enhance absorption and reduce the risk of digestive upset. Magnesium, in particular, can cause diarrhea when taken on an empty stomach. Taking your supplement with a meal that contains some fat can improve absorption of both minerals. If you’re taking the supplement for sleep support, take it with a light snack about 30-60 minutes before bed.

Can these supplements cause side effects?

Most people tolerate magnesium and potassium supplements well when taken as directed. The most common side effect is digestive discomfort, including diarrhea, especially with higher doses of magnesium. Some people experience nausea or stomach cramping. These effects usually improve by taking the supplement with food or reducing the dose. High doses of potassium can be dangerous for people with kidney problems. If you experience irregular heartbeat, severe weakness, or breathing difficulties, seek medical attention immediately.

How do I know if I need a magnesium potassium supplement?

Consider supplementation if you experience frequent muscle cramps, fatigue, irregular heartbeat, or poor sleep quality. People who sweat heavily, take diuretics, have digestive disorders, or consume alcohol regularly are at higher risk for deficiency. A blood test can confirm your levels, though standard tests may not reflect intracellular stores. If you eat a diet low in fruits, vegetables, nuts, and whole grains, you may not be getting enough of these minerals from food alone.

Can I take too much magnesium or potassium?

Yes, excessive intake of either mineral can be harmful. For magnesium, the upper limit from supplements is 350mg daily for adults; amounts above this can cause diarrhea and other digestive issues. Potassium toxicity is more serious and can cause dangerous heart rhythm problems, which is why the FDA limits over-the-counter supplements to 99mg per serving. People with healthy kidney function rarely experience toxicity from supplements, but those with kidney disease must be very careful with potassium intake.

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