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Magnesium Sulfate & Magnesium Supplements Guide

Learn about Magnesium sulfate and Magnesium supplementation for nervous system health, bone density, and muscle cramps. Explore key ingredients and benefits.

Understanding the Mineral

What Is Magnesium Sulfate and Why Does Magnesium Matter?

Magnesium sulfate — commonly known as Epsom salt — is one of many forms of supplemental Magnesium that have been used for centuries. Historically, Magnesium-rich mineral waters were consumed for their purported health benefits, and Epsom salts (Magnesium sulfate) have been used for centuries for their soothing properties. The healing spring of Epsom, England became famous in the 17th century; the water there was rich in Magnesium sulfate, and locals quickly noticed its cleansing and calming effects.

Magnesium itself is the fourth most abundant cation in the human body and a critical cofactor in hundreds of enzymatic reactions that regulate energy metabolism, neuromuscular function, cardiovascular health, bone integrity, immune defense, and psychological well-being. It is a cofactor in more than 300 enzyme systems that regulate diverse biochemical reactions in the body, including protein synthesis, muscle and nerve function, blood glucose control, and blood pressure regulation.

Nature's Sunshine Magnesium provides nervous system support and assists in a variety of bodily functions. Used by several hundred enzymes in their daily tasks, Magnesium is found in the bones, soft tissues, and blood. It helps metabolize various nutrients such as vitamin C, Phosphorus, potassium, and sodium. This formula delivers 250 mg of Magnesium from Magnesium oxide and Magnesium amino acid chelate in a base of Licorice root, Kelp plant, Peppermint leaves, and White willow bark.

Whether you're exploring Magnesium sulfate for its historical uses or looking for a well-rounded daily Magnesium supplement, understanding how Magnesium works in the body is essential. If you have questions about which form of Magnesium may be right for you, our naturopath is available for a free consultation.

How It Works

How Magnesium Supports Your Body

Magnesium plays a pivotal role in ATP synthesis — the molecule your body uses to store and release energy. Mg²⁺ is indispensable for cellular energy generation across virtually all tissues. This makes Magnesium essential for everything from muscle contraction to nerve signaling.

In the nervous system, Magnesium modulates neuronal excitability through voltage-gated Calcium antagonism and NMDA receptor blockade. This means it helps regulate how excitable your nerve cells are, supporting calm, balanced neurological function. Magnesium deficiency can lead to symptoms such as muscle cramps, fatigue, weakness, numbness, and tingling.

For bone health, 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. Research suggests that people with higher levels of Magnesium may have higher bone mineral density, which is important for reducing the risk of bone fractures.

Calcium and Magnesium are nutritional partners and work best when taken together. This formula includes 40 mg of Calcium alongside its 250 mg of Magnesium, reflecting that synergy. Vitamin D and Magnesium also help the body better absorb Calcium, creating a tightly coordinated mineral system.

Qué contiene

Key Ingredients

Magnesium — 250 mg
Magnesium is an essential mineral and cofactor for over 300 enzymatic reactions, including protein synthesis, muscle and nerve function, blood glucose control, and blood pressure regulation. It is required for ATP synthesis and cellular energy production across virtually all tissues. For bone health, 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. In the nervous system, Magnesium acts as a natural NMDA receptor antagonist, modulating synaptic transmission and neuronal excitability, and deficiency is associated with increased risk of neurological symptoms. For muscle function, Magnesium deficiency impairs muscle relaxation — muscles contract normally but 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. Additionally, Magnesium supports electrolyte balance as a primary intracellular electrolyte required for sodium-potassium ATPase function, making it foundational to all electrolyte transport. Emerging evidence confirms that nearly two-thirds of the population in the western world is not achieving the recommended daily allowance for Magnesium.
Calcium — 40 mg
Calcium is the most abundant mineral in the human body, with more than 99% stored in bone as hydroxyapatite. It is the primary mineral constituent of bone and the most extensively studied supplement for bone density. Meta-analyses of RCTs demonstrate that Calcium supplementation significantly improves bone mineral density, particularly in people under 35 building peak bone mass. Beyond skeletal support, Calcium is essential for muscle contraction and relaxation — low Calcium intake is associated with muscle spasms, cramps, and weakness, and correction of hypocalcemia resolves neuromuscular symptoms including cramping. Calcium ions also play a key role in the nervous system, where they are responsible for stabilizing membrane potential and controlling the excitability of neurons. NIH identifies Calcium as one of the seven primary electrolytes essential for muscle contraction, nerve transmission, enzyme activity, and blood coagulation.
Phosphorus — 30 mg
Phosphorus is the second most abundant mineral in the human body, with approximately 85% residing in bones and teeth as hydroxyapatite. Together with Calcium, it forms the mineral matrix that provides bones and teeth with structural integrity and strength. Phosphorus also helps the body make ATP, the body's major source of energy, and plays key roles in regulation of gene transcription, activation of enzymes, and maintenance of normal pH in extracellular fluid. For the nervous system, phospholipids — which contain Phosphorus as an essential structural element — are the primary components of neuronal cell membranes and are required for synaptic neurotransmission. Phosphate-based high-energy molecules (ATP, phosphocreatine) fuel all nervous system function. Additionally, Phosphorus regulates the normal function of nerves and muscles, including the heart, and is recognized as one of the seven major electrolytes per NIH.
Kelp Leaf and Stem
Kelp is a form of brown seaweed that serves as a rich source of vitamins and minerals, including dietary iodine. The main groups of biologically active compounds in Kelp are polysaccharides (alginic acid, laminarin, fucoidan, and others) and minerals including iodine compounds, Magnesium, potassium, Calcium, and iron. Kelp has a long history of medicinal use — the Japanese and Chinese cultures used seaweed to treat various ailments as long ago as 300 BC, and Pacific Northwest Indigenous Peoples used it to treat headaches and other conditions. Research has found that Kelp supplementation can alter thyroid-related markers through its iodine delivery, its primary established mechanism in humans.
Licorice root
Licorice root (Glycyrrhiza glabra) has been used worldwide as a medicine for over 4,000 years, recorded in texts such as the Assyrian Herbal (2000 BC) and the Ebers Papyrus (1600 BC). It was traditionally used for coughing, asthma, wound healing, and gastrointestinal problems such as gastritis and peptic ulcers. The main constituent is glycyrrhizin, a triterpenoid saponin, alongside flavonoids including liquiritin and isoliquiritigenin. The German Commission E approves the use of licorice for catarrhal conditions of the upper respiratory tract, and the EMA recommends it as an expectorant for cough associated with the common cold. Licorice appears in approximately 60% of traditional Chinese medicine prescriptions.
Peppermint Leaves
Peppermint (Mentha × piperita) is a hybrid mint with a long history of use — dried Peppermint leaves were found in Egyptian pyramids dating back to 1000 BC. Its main active constituents are menthol (approximately 40%) and menthone (approximately 23%). Menthol blocks Calcium channels in smooth muscle, producing antispasmodic effects on the gastrointestinal tract. The herb has traditionally been used as a remedy for indigestion since ancient Egyptian times, and the German Commission E approved Peppermint leaf for spastic complaints of the gastrointestinal tract. A 2022 systematic review of 10 RCTs found Peppermint oil was more efficacious than placebo for global IBS symptoms and abdominal pain.
White willow Bark
White willow bark (Salix alba) has a history stretching back more than 3,500 years, when it was used as a painkiller and antipyretic by Sumerians, Egyptians, and later by Hippocrates for fever and pain. The primary medicinal constituents are salicylate glycosides, particularly salicin and salicortin. Salicin is metabolized to salicylic acid, which inhibits cyclooxygenases (COX I, II). However, research shows that the multi-component active principle of willow bark — including its polyphenols and flavonoids — provides a broader mechanism of action than salicin alone. The EMA states that dry willow bark extract can be used for short-term treatment of lower back pain, supported by moderate evidence from RCTs.
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Who Benefits

Who Is This Magnesium Formula For?

This formula may be a good fit for anyone looking to support their nervous system, maintain bone density, or address occasional muscle cramps. It's designed for daily use, delivering Magnesium alongside complementary minerals and a traditional herbal base.

Adults who may not be getting enough Magnesium through diet alone could find this supplement particularly helpful. Research estimates that between 56 and 68% of Americans do not obtain enough Magnesium 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 most likely to have low intakes.

Older adults may especially benefit, as Magnesium absorption and retention can decrease with age, leading to deficiency and health consequences. Individuals taking certain medications — such as diuretics or proton pump inhibitors — may also be at elevated risk for Magnesium depletion.

If you're unsure whether a Magnesium supplement is appropriate for your individual needs, we invite you to take advantage of our free naturopathic consultation. Our naturopath can help you think through which form and amount may best support your health goals.

Directions

How to Take This Magnesium Supplement

Take 1 tablet daily with a meal.

Each tablet provides 250 mg of Magnesium from Magnesium oxide and Magnesium amino acid chelate, along with 40 mg of Calcium and 30 mg of Phosphorus. The bottle contains 180 tablets.

Magnesium supplements can occasionally cause softening of stool or mild gastrointestinal effects, particularly at higher doses. Taking the tablet with food, as directed, may help minimize any digestive discomfort. If you take medications such as bisphosphonates, tetracycline or quinolone antibiotics, or proton pump inhibitors, be aware that timing your Magnesium separately from these medications is typically recommended — our naturopath can help you navigate those considerations during a free consultation.

Sobre el autor

Escrito por 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.

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Preguntas frecuentes

What is Magnesium sulfate, and how does it differ from Magnesium oxide?

Magnesium sulfate, commonly known as Epsom salt, has been used for centuries for its soothing properties — the famous healing spring at Epsom, England became renowned in the 17th century for water rich in Magnesium sulfate. Magnesium oxide, on the other hand, is one of the most concentrated supplemental forms by weight but has lower bioavailability compared to organic salts. This Nature's Sunshine formula uses Magnesium oxide and Magnesium amino acid chelate. Both Magnesium sulfate and Magnesium oxide are classified as inorganic Magnesium forms.

Why does this formula include Calcium with Magnesium?

Calcium and Magnesium are nutritional partners and work best when taken together. Magnesium helps the body better absorb Calcium and is required for vitamin D activation — a nutrient that also facilitates Calcium absorption. Both minerals support bone health and muscle function: Calcium is essential for muscle contraction, while Magnesium supports muscle relaxation.

How common is Magnesium deficiency?

Magnesium deficiency is quite common. 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. Older adults, individuals with type 2 diabetes, people with gastrointestinal disorders, and those taking certain long-term medications like diuretics and proton pump inhibitors are at elevated risk. Early signs of deficiency include loss of appetite, nausea, fatigue, and weakness; more severe deficiency may cause muscle cramps, numbness, tingling, and abnormal heart rhythms.

Can Magnesium supplements support bone density?

Research suggests that Magnesium is involved in bone formation and influences the activities of osteoblasts and osteoclasts — the cells responsible for building and breaking down bone. Observational data from large cohort studies found higher Magnesium intake associated with greater bone density in women. Magnesium also affects concentrations of parathyroid hormone and the active form of vitamin D, both major regulators of bone homeostasis. However, further research is needed to fully elucidate the role of Magnesium in the prevention and management of osteoporosis.

Does Magnesium help with muscle cramps?

Magnesium is the most studied mineral supplement for skeletal muscle cramps. Magnesium deficiency impairs muscle relaxation — muscles contract normally but struggle to fully release when levels are low. However, Cochrane reviews of multiple RCTs found that Magnesium supplementation is unlikely to provide meaningful cramp prophylaxis in older adults with idiopathic cramps, though evidence for pregnancy-associated leg cramps remains conflicting. Ensuring adequate Magnesium intake may still support overall muscle function.

Should I be concerned about interactions between Magnesium supplements and medications?

Magnesium can interact with certain medications. It may decrease the absorption of bisphosphonates (such as alendronate), tetracycline and quinolone antibiotics, and gabapentin. Loop and thiazide diuretics can deplete Magnesium, while proton pump inhibitors taken for prolonged periods can cause low Magnesium levels. Separating doses by at least two hours is typically recommended for antibiotics and bisphosphonates. If you take any medications, our naturopath is happy to discuss timing and potential interactions during a free consultation.

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Magnesium Sulfate & Magnesium Supplements Guide