The Best Magnesium Complex | Heart, Brain & Bone

Magnesium is the fourth most abundant cation in the human body and a critical cofactor in more than 300 enzyme systems that regulate energy metabolism, neuromuscular function, cardiovascular health, bone integrity, and psychological well-being. Yet emerging evidence confirms that nearly two-thirds of the population in the western world is not achieving the recommended daily allowance — a deficiency problem contributing to various health conditions.

When we talk about the best Magnesium Complex, the conversation starts with form. Not all Magnesium supplements are created equal. Nature's Sunshine Magnesium Complex pairs two organic, highly soluble forms — Magnesium citrate and Magnesium malate — in a single capsule designed to support the cardiovascular system, brain, kidneys, and bones. Organic forms of Magnesium such as citrate and malate are generally more soluble and have higher bioavailability than inorganic forms like Magnesium oxide.

If you have questions about whether a Magnesium Complex is right for your individual needs, our naturopath is available for a free consultation to help you think it through.

Magnesium supplements are broadly categorized into organic and inorganic compounds. Organic forms — such as citrate and malate — involve Magnesium chelated to organic acids, and these forms are generally more soluble and have higher bioavailability. Inorganic forms, such as Magnesium oxide, are bound to inorganic salts and tend to have lower solubility and absorption rates.

Research has demonstrated that Magnesium citrate had high solubility even in water (55%) and was substantially more soluble than Magnesium oxide in all states of acid secretion. This matters because higher solubility translates to more efficient absorption in the digestive tract.

By combining citrate and malate, this Magnesium Complex delivers 184 mg of Magnesium per two-capsule serving through two complementary organic pathways. The result is a highly soluble formula that supports the brain, heart, and kidneys with this essential mineral.

Cardiovascular System

Magnesium plays a well-documented role in cardiovascular health. It regulates cardiac excitation, vascular tone, and endothelial function. Research suggests that lower Magnesium levels are consistently associated with higher risks of arrhythmia, hypertension, coronary artery disease, and heart failure. Multiple RCTs and meta-analyses show that Magnesium supplementation produces modest but significant reductions in blood pressure, particularly in Magnesium-deficient or hypertensive individuals.

In 2022, the U.S. Food and Drug Administration approved a qualified health claim stating that consuming diets with adequate Magnesium may reduce the risk of high blood pressure, although the FDA concluded that the evidence is inconsistent and inconclusive. Magnesium also participates in vascular calcification prevention and research suggests it may support arterial flexibility — one 24-week RCT found Magnesium citrate significantly reduced arterial stiffness.

Nervous System

Magnesium is fundamental to nervous system function, acting as a physiological NMDA receptor antagonist and regulator of neuronal excitability, neuromuscular transmission, and nerve signaling. Research suggests it plays a critical role in nerve excitability by blocking NMDA receptors and regulating calcium and potassium channels. It is also a cofactor in dopamine synthesis and supports inhibitory-excitatory neurotransmitter balance.

Hypomagnesemia is clinically associated with neuromuscular hyperexcitability, tremors, and seizures, and Magnesium deficiency is linked to neurological concerns ranging from migraine to mood changes.

Skeletal System and Bone Density

Magnesium is involved in bone formation and influences the activities of osteoblasts and osteoclasts. It also affects concentrations of both parathyroid hormone and the active form of vitamin D — two major regulators of bone homeostasis. Observational data from large cohort studies found that higher Magnesium intake is associated with 2–3% greater bone density in women, and a systematic review and meta-analysis found higher intake associated with increased hip and femoral neck bone mineral density in older adults.

While further long-term clinical studies are needed, the preliminary evidence suggests that maintaining adequate Magnesium intake supports healthy bone metabolism.

Inflammation

A 2022 meta-analysis of 17 randomized controlled trials involving 889 participants found that Magnesium supplementation significantly decreased serum C-reactive protein (CRP) and increased nitric oxide (NO) levels. Though the clinical relevance of these biomarker changes for long-term health outcomes requires further investigation, the evidence for biomarker reduction is considered moderate.

It is estimated that between 56 and 68% of Americans do not obtain enough Magnesium in their diet on a daily basis to meet the recommended daily allowance. The diets of most people in the United States provide less than the recommended amounts, with men older than 70 and teenage girls most likely to have low intakes.

Certain groups are more likely than others to have Magnesium inadequacy. These include older adults (due to decreased absorption), individuals with gastrointestinal disorders, those with type 2 diabetes, people with alcohol dependence, and individuals on certain long-term medications such as diuretics and proton pump inhibitors.

As we age, Magnesium absorption and retention can decrease, leading to deficiency and health consequences. Older people are more susceptible due to decreased absorption from food, increased medication use, and potential dietary restrictions.

Early signs and symptoms of Magnesium deficiency include loss of appetite, nausea, fatigue, and weakness. As deficiency worsens, numbness, tingling, muscle cramps, personality changes, and abnormal heart rhythms can occur. If you're wondering whether your current Magnesium intake is adequate, our naturopath offers free consultations to help you evaluate your individual situation.

Take 2 capsules twice daily with a meal.

Each bottle contains 100 capsules. Magnesium supplements can occasionally cause digestive side effects such as softening of stool, nausea, or cramping. These side effects are more common at higher doses and are also more common with inorganic forms of Magnesium such as Magnesium oxide. The organic forms in this complex — citrate and malate — are generally better tolerated.

Important drug interaction note: Magnesium may interact with certain medications. It can decrease the absorption of bisphosphonates (used for osteoporosis) and should be separated by at least 2 hours. It can form insoluble complexes with tetracycline and quinolone antibiotics — the antibiotic should be taken at least 2 hours before or 4–6 hours after Magnesium. Loop and thiazide diuretics may deplete Magnesium through increased urinary excretion. Proton pump inhibitors taken for prolonged periods can cause low Magnesium levels. Magnesium may also reduce the absorption of gabapentin by 20%. Always consult your healthcare provider if you take prescription medications.