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Magnesium Oxide Supplement | Nervous System & Bone

Learn how Magnesium oxide supports nervous system health, bone density, and muscle relaxation. Discover key ingredients, directions, and FAQs in our guide.

What It Is

Understanding Magnesium Oxide and Why It Matters

Magnesium oxide is one of the most concentrated forms of supplemental Magnesium by weight and has been used for generations to help people meet their daily Magnesium needs. Nature's Sunshine Magnesium delivers 250 mg of Magnesium per tablet, combining Magnesium oxide and Magnesium amino acid chelate in a thoughtfully formulated base of Licorice root, Kelp plant, Peppermint leaves, and White willow bark.

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 more. It is required for energy production, oxidative phosphorylation, and glycolysis β€” making it indispensable for cellular energy generation across virtually all tissues.

This formula is designed to support three interconnected areas of health: nervous system function, bone density, and healthy muscle relaxation. Calcium and Magnesium are nutritional partners and work best when taken together, which is why this formula also includes Calcium alongside Phosphorus for complementary mineral support.

Emerging evidence confirms that nearly two-thirds of the population in the western world is not achieving the recommended daily allowance for Magnesium β€” a deficiency problem contributing to various health conditions. If you're unsure whether your Magnesium intake is adequate, our naturopath is available for a free consultation to help you evaluate your needs.

How It Works

Magnesium Oxide: Supporting Multiple Body Systems

Nature's Sunshine Magnesium is used by several hundred enzymes in their daily tasks, helping metabolize various nutrients such as vitamin C, Phosphorus, potassium, and sodium. Magnesium is found in the bones, soft tissues, and blood, where it plays essential roles across multiple body systems.

Nervous System Support: Magnesium modulates neuronal excitability through voltage-gated Calcium antagonism and N-methyl-D-aspartate (NMDA) receptor blockade, helping to regulate normal nerve signaling. Research suggests that deficiency is associated with increased risk of neurological symptoms, and supplementation supports normal nerve function.

Bone Density: Magnesium is involved in bone formation and influences the activities of osteoblasts and osteoclasts. It also affects the concentrations of both parathyroid hormone and the active form of vitamin D, which are major regulators of bone homeostasis. Observational data from large cohort studies found higher Magnesium intake associated with 2–3% greater bone density in women.

Muscle Relaxation: Magnesium is essential for both muscle contraction and relaxation. Research suggests that Magnesium deficiency impairs muscle relaxation, as muscles contract normally but may struggle to fully release when levels are low. A 2024 systematic review found Magnesium supplementation reduced muscle soreness, improved performance and recovery, and exerted a protective effect on muscle damage in physically active individuals.

Energy Production: Mg²⁺ plays a pivotal role in ATP synthesis, the body's primary energy currency. This makes Magnesium oxide supplementation relevant for anyone seeking to support natural energy production at the cellular level.

Proper Elimination: Magnesium supplements are well recognized for promoting healthy bowel regularity by supporting smooth muscle function in the digestive tract.

What's inside

Key Ingredients

Calcium β€” 40 mg
Calcium is the most abundant mineral in the human body, with more than 99% stored in bone as hydroxyapatite. It is essential for skeletal strength, muscle contraction, and nerve transmission. Research suggests that Calcium is the primary mineral constituent of bone and the most extensively studied supplement for bone density. Meta-analyses of randomized controlled trials demonstrate that Calcium supplementation may significantly improve bone mineral density (BMD), particularly in people under 35 building peak bone mass. Calcium is also essential for muscle contraction and relaxation β€” hypocalcemia (low Calcium) is recognized in standard medical references as a cause of muscle cramps, tetany, and spasms, and correction of low Calcium levels may resolve neuromuscular symptoms including cramping. Calcium and Magnesium are nutritional partners and work best when taken together, making this pairing especially thoughtful in a Magnesium-focused formula.
Phosphorus β€” 30 mg
Phosphorus is the second most abundant mineral in the human body, with approximately 85% stored in bones and teeth as hydroxyapatite alongside Calcium. It is a component of DNA, RNA, cell membranes, and adenosine triphosphate (ATP) β€” the body's primary energy molecule. Research recognizes Phosphorus as essential for bone mineralization and maintaining bone mineral density; deficiency causes rickets in children and osteomalacia in adults. Phospholipids containing Phosphorus are the primary components of neuronal cell membranes and are required for synaptic neurotransmission, while phosphate-based high-energy molecules fuel all nervous system function. Phosphorus also helps regulate the normal function of nerves and muscles, including the heart, and plays important roles in how the body uses carbohydrates and fats.
Magnesium β€” 250 mg
Magnesium is a critical cofactor in more than 300 enzyme systems regulating energy metabolism, neuromuscular function, cardiovascular health, bone integrity, and psychological well-being. This formula delivers 250 mg per tablet as Magnesium oxide and Magnesium amino acid chelate. Research suggests that Magnesium is involved in bone formation and influences osteoblast and osteoclast activity; observational data from large cohort studies found higher Magnesium intake associated with 2–3% greater bone density in women, and clinical trials including the COMB study suggest supplementation may attenuate bone loss. Magnesium is fundamental to nervous system function, acting as a physiological NMDA receptor antagonist and regulator of neuronal excitability and neuromuscular transmission. It is the most studied mineral supplement for skeletal muscle cramps; deficiency impairs muscle relaxation, as muscles contract normally but struggle to fully release when levels are low. A 2024 systematic review in the Journal of Translational Medicine found Magnesium supplementation reduced muscle soreness and exerted a protective effect on muscle damage. Magnesium also participates in insulin secretion and receptor signaling, and supplementation has been associated with significant reductions in serum C-reactive protein (CRP) across 17 randomized controlled trials.
Kelp leaf and stem
Kelp is a brown algae (order Laminariales) that has been used in traditional medicine for centuries, particularly in East Asian cultures, where the Japanese have incorporated Kelp into their diets for 1,500 years. It is a rich source of vitamins and minerals, and an excellent source of dietary iodine, an essential trace element required for the biosynthesis of thyroid hormones. The main groups of biologically active compounds in Kelp include polysaccharides such as alginic acid, laminarin, and fucoidan, along with minerals including iodine, Magnesium, potassium, Calcium, and iron. Kelp has historically been used by Pacific Northwest Indigenous peoples and in Traditional Chinese Medicine to support various aspects of health.
Licorice root
Licorice root (Glycyrrhiza glabra) has been used worldwide as a medicine for over 4,000 years, with medicinal uses recorded in texts as ancient as the Assyrian Herbal (2000 BC) and the Ebers Papyrus (1600 BC). It appears in approximately 60% of traditional Chinese medicine prescriptions, where it has historically been valued for supporting digestive comfort, respiratory health, and as an harmonizing agent in herbal formulas. Licorice root has traditionally been used in herbal medicine to help soothe gastrointestinal concerns such as gastritis and peptic ulcers. The German Commission E approves the use of licorice for catarrhal conditions of the upper respiratory tract. It consists of up to 300 active compounds, including glycyrrhizin, flavonoids, and polyphenols.
Peppermint leaves
Peppermint (Mentha Γ— piperita) is a hybrid mint that has been used as a remedy for digestive discomfort since ancient Egyptian times, with dried leaves found in pyramids dating back to 1000 BC. The ancient Greeks and Romans valued it as a stomach soother. The main constituents of Peppermint are menthol and menthone. Peppermint contains L-menthol, which has been shown in research to block Calcium channels in smooth muscle, producing antispasmodic effects on the gastrointestinal tract. The German Commission E approved Peppermint leaf for spastic complaints of the gastrointestinal tract. It has traditionally been taken as a carminative to support healthy digestion.
White willow bark
White willow bark (Salix alba) has a medicinal history stretching back more than 3,500 years β€” it was used as a pain reliever and fever reducer by Sumerians, Egyptians, and the ancient Greeks, with Hippocrates reportedly prescribing willow bark for fever and pain. The characteristic constituents are salicin derivatives, along with flavonoids and condensed tannins (8–20% of dry bark weight). White willow bark has historically been used to support comfort and ease occasional aches. It also possesses antioxidant properties; research suggests the extract significantly raises reduced glutathione (GSH) levels, which may help limit oxidative stress.
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Who Benefits

Who May Benefit from Magnesium Oxide Supplementation

Because Magnesium is involved in so many fundamental processes, a wide range of people may find this formula supportive. Research suggests that the diets of most people in the United States provide less than the recommended amounts of Magnesium, with men older than 70 and teenage girls being most likely to have low intakes.

Adults concerned about bone health: Magnesium supports bone formation and works alongside Calcium and Phosphorus β€” all three of which are included in this formula β€” to promote skeletal integrity. People with higher levels of Magnesium may have higher bone mineral density, which is important in helping reduce the risk of bone fractures associated with osteoporosis.

Those experiencing occasional muscle tension: Whether from exercise, daily activity, or occasional cramping, Magnesium oxide supports muscle relaxation. Magnesium deficiency is associated with muscle cramps, weakness, and impaired exercise performance.

People seeking nervous system support: Magnesium is fundamental to nervous system function, regulating neuronal excitability and neuromuscular transmission. This formula may be especially relevant for those looking to support calm, balanced nerve function.

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

Not sure if Magnesium oxide is right for your situation? We offer free naturopathic consultations β€” our naturopath can help you determine whether this formula fits your wellness goals.

Directions

How to Take Magnesium Oxide

Take 1 tablet daily with a meal.

Each bottle contains 180 tablets, providing a six-month supply at the recommended serving size of one tablet per day. Taking Magnesium oxide with food supports absorption and may reduce the likelihood of digestive discomfort.

About the author

Written by Greg Howlett

GH

Greg Howlett

Founder

Greg has spent over a decade helping customers choose the right natural-health products. He personally vets every formula we carry and writes these guides to cut through the marketing noise with practical, experience-based advice.

FAQ

Frequently asked questions

How many enzymes does Magnesium support in the body?

Magnesium is a cofactor in more than 300 enzyme systems that regulate diverse biochemical reactions, including protein synthesis, muscle and nerve function, blood glucose control, and blood pressure regulation. Nature's Sunshine notes this formula is necessary for the function of 300 enzymes.

What forms of Magnesium are in this supplement?

This formula combines Magnesium oxide and Magnesium amino acid chelate to deliver 250 mg of Magnesium per tablet, set in a base of Licorice root, Kelp plant, Peppermint leaves, and White willow bark.

Why are Calcium and Magnesium included together?

Calcium and Magnesium are nutritional partners and work best when taken together. Both minerals play essential roles in bone health, muscle function, and nerve transmission. This formula provides 40 mg of Calcium alongside 250 mg of Magnesium to support these complementary functions.

How common is Magnesium deficiency?

Research estimates 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 of Magnesium, with men older than 70 and teenage girls being most likely to have low intakes.

Can Magnesium oxide cause digestive side effects?

Magnesium supplements can sometimes cause softening of stool, nausea, or cramping. Side effects are generally more common at higher doses and with inorganic forms such as Magnesium oxide. Taking this supplement with a meal, as directed, may help minimize any digestive discomfort. Extra Magnesium from food is generally safe because the kidneys efficiently eliminate excess amounts.

Does Magnesium interact with any medications?

Magnesium may interact with certain medications, including bisphosphonates, tetracycline and quinolone antibiotics, some diuretics, proton pump inhibitors (PPIs), and gabapentin. If you take any of these medications, it is best to separate doses by at least two hours and consult with a healthcare provider. Our naturopath is available for free consultations if you have questions about potential interactions.

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Magnesium Oxide Supplement | Nervous System & Bone