Magnesium Glycinate vs Citrate | Forms Compared

If you've ever stood in the supplement aisle wondering about Magnesium glycinate vs citrate, you're not alone — it's one of the most common questions our naturopath fields during free consultations. Both forms deliver the essential mineral Magnesium, but they differ in how they're absorbed and how they feel in your body.

Magnesium 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. It's also required for energy production, oxidative phosphorylation, and glycolysis. Despite its importance, an estimated 56 to 68% of Americans do not obtain enough Magnesium in their diet on a daily basis to meet the recommended daily allowance.

Understanding the differences between Magnesium forms can help you choose the one that best fits your health goals — whether that's supporting nervous system health, maintaining bone density, or easing occasional muscle cramps.

Magnesium supplements are broadly categorized into organic and inorganic compounds. Magnesium citrate and Magnesium glycinate (bisglycinate) are both organic forms, meaning Magnesium is chelated to organic molecules — citric acid and the amino acid glycine, respectively. These organic forms are generally more soluble and have higher bioavailability than inorganic forms such as Magnesium oxide.

Magnesium Citrate

Magnesium citrate is one of the most bioavailable forms, with high solubility in water, leading to efficient absorption. Research found that Magnesium citrate had high solubility even in water (55%) and was substantially more soluble than Magnesium oxide in all states of acid secretion. One short-term study found that 290 mg/day of elemental Magnesium as Magnesium citrate for 30 days in 20 postmenopausal women with osteoporosis suppressed bone turnover compared with placebo, suggesting that bone loss decreased.

Magnesium Glycinate

Magnesium glycinate is often recommended for individuals with sensitive digestive systems, as it tends to cause fewer gastrointestinal side effects. The absorption of Magnesium chelated with amino acids, such as Magnesium glycinate, via the dipeptide transporter pathway has also been observed. A 2025 randomized, placebo-controlled trial found that 28 days of supplementation with 250 mg elemental Magnesium as Magnesium bisglycinate resulted in modest but statistically significant improvements in insomnia severity index scores in adults with self-reported primary insomnia symptoms.

Magnesium Oxide

By contrast, Magnesium oxide — an inorganic form — was found to be virtually insoluble in water and only 43% soluble in simulated peak acid secretion. While it is the most concentrated form by weight, it has lower bioavailability compared to organic salts. Side effects are also more common with inorganic forms of Magnesium, such as Magnesium oxide. Nature's Sunshine Magnesium contains Magnesium oxide alongside Magnesium amino acid chelate, combining a concentrated source with a chelated form for balanced delivery.

If you're unsure which form is right for you, our naturopath is happy to talk through the options during a free consultation — no membership or commitment required.

Regardless of which form you choose in the Magnesium glycinate vs citrate debate, the mineral itself plays remarkably broad roles in the body.

Nervous System Support

Magnesium is fundamental to nervous system function, acting as a physiological NMDA receptor antagonist and regulator of neuronal excitability, neuromuscular transmission, and nerve signaling. Hypomagnesemia is clinically associated with neuromuscular hyperexcitability, tremors, and seizures, while Magnesium deficiency is linked to neurological concerns ranging from migraine to mood changes.

Bone Density

Magnesium is an essential cofactor in bone mineral metabolism, enzyme activity for bone matrix synthesis, and is required for vitamin D activation. Observational data from large cohort studies found higher Magnesium intake associated with 2–3% greater bone density in women. Magnesium influences the activities of osteoblasts and osteoclasts and affects the concentrations of both parathyroid hormone and the active form of vitamin D, which are major regulators of bone homeostasis.

Muscle Relaxation

Magnesium is the most studied mineral supplement for skeletal muscle cramps. It regulates muscle contraction via intracellular Calcium transport. Magnesium deficiency impairs muscle relaxation — 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, making it indispensable for cellular energy generation across virtually all tissues. Without adequate Magnesium, the body's ability to produce and use its primary energy currency is compromised.

The question of Magnesium glycinate vs citrate often arises from people who already know they need more Magnesium — and most Americans likely do. 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.

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

Nature's Sunshine Magnesium is formulated for adults looking to support nervous system health, bone density, and healthy muscle function. It pairs Magnesium with Calcium — since these two minerals are nutritional partners that work best when taken together — plus Phosphorus for skeletal support and a base of traditional herbs.

If you're not sure whether Magnesium glycinate, citrate, or a chelated form like this one is the best fit for your situation, our naturopath offers free consultations to help you sort through the options.

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 in a base of Licorice root, Kelp plant, Peppermint leaves, and White willow bark. The bottle contains 180 tablets.

The Recommended Dietary Allowance for Magnesium is 400–420 mg/day for adult men and 310–320 mg/day for adult women. Food sources such as leafy greens, nuts, seeds, and whole grains contribute additional dietary Magnesium alongside supplementation.