Magnesium Complex Supplement Reviews

If you've been searching for Magnesium Complex supplement reviews, you're likely trying to understand whether a multi-form Magnesium product can genuinely support your heart, brain, bones, and nervous system. We wrote this guide to help you understand exactly what Nature's Sunshine Magnesium Complex offers, what the research says about its ingredients, and who may benefit most.

Nature's Sunshine Magnesium Complex combines two organic forms of Magnesium — Magnesium citrate and Magnesium malate — in a single, highly soluble capsule. Two capsules deliver 184 mg of Magnesium, and the formula is designed to support the cardiovascular system while also helping brain, kidney, and heart functions.

Magnesium is the fourth most abundant cation in the human body and serves as a cofactor in more than 300 enzyme systems. It is required for energy production, protein synthesis, muscle and nerve function, blood glucose control, and blood pressure regulation. Despite its fundamental importance, an estimated 56–68% of Americans do not obtain enough Magnesium from their daily diet to meet the recommended daily allowance.

Not all Magnesium supplements are created equal. The form of Magnesium determines how well your body can absorb and use it. Magnesium supplements are broadly categorized into organic and inorganic compounds. Organic forms — such as citrate, malate, glycinate, and lactate — involve Magnesium chelated to organic molecules and are generally more soluble with higher bioavailability. Inorganic forms like Magnesium oxide tend to have lower solubility and absorption rates.

Magnesium citrate, one of the two forms in this complex, is recognized as one of the most bioavailable forms available. Research shows that Magnesium citrate has high solubility even in water (55%) and is 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.

Magnesium malate, the second form, is also an organic salt that pairs Magnesium with malic acid. Like citrate, organic Magnesium forms such as malate are generally more soluble and have higher bioavailability than inorganic salts. By combining these two complementary organic forms, Magnesium Complex is designed for optimum effectiveness — a key consideration when reading Magnesium Complex supplement reviews.

Cardiovascular Support

Research suggests Magnesium plays a well-documented role in cardiovascular health. Multiple large meta-analyses and prospective cohort studies consistently associate higher Magnesium levels with lower risks of coronary heart disease, stroke, atrial fibrillation, and heart failure. In 2022, the U.S. FDA approved a qualified health claim stating that consuming diets with adequate Magnesium may reduce the risk of high blood pressure, though the agency concluded the evidence is inconsistent and inconclusive.

A meta-analysis of 17 RCTs (889 participants) found that Magnesium supplementation significantly decreased serum C-reactive protein (CRP) and increased nitric oxide (NO) levels — both markers relevant to vascular health and inflammation. A 24-week RCT also demonstrated that Magnesium citrate supplementation significantly reduced arterial stiffness without altering blood pressure.

Bone Density and Skeletal Health

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 — 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.

One short-term study found that 290 mg/day of elemental Magnesium (as Magnesium citrate) for 30 days suppressed bone turnover in postmenopausal women with osteoporosis compared with placebo. However, clinical trial evidence for supplementation outcomes remains limited and short-term; further research is needed to fully define Magnesium's role in osteoporosis prevention.

Nervous System Function

Magnesium is fundamental to nervous system function, acting as a physiological NMDA receptor antagonist that modulates neuronal excitability, neuromuscular transmission, and nerve signaling. Deficiency is associated with increased risk of neurological symptoms including neuromuscular hyperexcitability, tremors, and seizures.

Research also suggests that Magnesium plays a critical role in nerve excitability by blocking NMDA receptors and regulating calcium and potassium channels. Clinical evidence supports Magnesium supplementation for nerve excitability modulation and neuropathic pain reduction. Additionally, Magnesium serves as an essential cofactor in dopamine synthesis and supports inhibitory-excitatory neurotransmitter balance.

Because an estimated 56–68% of Americans fall short of the recommended daily allowance for Magnesium, supplementation may benefit a broad range of adults. However, certain groups are more likely than others to have Magnesium inadequacy, including older adults (due to decreased absorption), individuals with gastrointestinal disorders, those with type 2 diabetes, people with alcohol dependence, and individuals taking certain long-term medications such as diuretics or proton pump inhibitors.

Men older than 70 and teenage girls are identified as most likely to have low intakes. As we age, Magnesium absorption and retention can decrease, leading to potential deficiency and health consequences. Early signs of deficiency include loss of appetite, fatigue, and weakness; as deficiency worsens, symptoms can progress to numbness, tingling, muscle cramps, and abnormal heart rhythms.

If you take bisphosphonates, tetracycline or quinolone antibiotics, diuretics, proton pump inhibitors, or gabapentin, be aware that Magnesium may interact with these medications. Timing separation is generally recommended — for example, Magnesium and bisphosphonates should be separated by at least 2 hours. Our naturopath is available for a free consultation if you'd like personalized guidance on whether this supplement fits your health picture.

Take 2 capsules twice daily with a meal. Each serving of 2 capsules contains 184 mg of Magnesium from both citrate and malate forms. The bottle contains 100 capsules.

The Recommended Dietary Allowance (RDA) for Magnesium is 400–420 mg/day for adult men and 310–320 mg/day for adult women. Taking this product as directed (4 capsules daily across two servings) provides 368 mg of Magnesium, which fits within the typical supplementation range. The Tolerable Upper Intake Level (UL) for supplemental Magnesium is 350 mg; however, this UL applies only to supplemental Magnesium and does not include Magnesium from food and beverages. Recent data suggest that doses modestly above the current UL from supplements can be consumed without adverse events in most healthy adults.

The most common side effects of Magnesium supplementation are stomach-related issues such as softening of stool, and these effects are more common at higher doses and with inorganic forms like Magnesium oxide. Organic forms like the citrate and malate used in this formula tend to be better tolerated. Individuals with impaired kidney function should consult a healthcare provider before supplementing, as the kidneys are responsible for excreting excess Magnesium.