Magnesium Citrate vs Glycinate: Key Differences

If you've ever stood in front of a shelf full of Magnesium supplements wondering which form is right for you, you're not alone. The Magnesium citrate vs glycinate question is one we hear regularly — from customers calling our store and from folks sitting down for a free consultation with our naturopath. Both forms are organic Magnesium salts with higher bioavailability than inorganic options like Magnesium oxide, but they differ in meaningful ways.

Magnesium itself 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. It is naturally present in many foods — green leafy vegetables, nuts, seeds, whole grains, fish, and dairy — yet research suggests that between 56 and 68 percent of Americans do not obtain enough Magnesium daily to meet the recommended dietary allowance.

Understanding the differences between citrate and glycinate can help you choose the form that best fits your body and your goals.

Magnesium supplements are broadly categorized into organic and inorganic compounds. Organic forms — such as Magnesium citrate, glycinate, lactate, or malate — involve Magnesium chelated to organic molecules like amino acids or organic acids. These forms are generally more soluble and have higher bioavailability than inorganic forms such as Magnesium oxide, sulphate, and chloride.

Magnesium Citrate

Magnesium citrate is one of the most bioavailable forms, with high solubility in water, leading to efficient absorption. In one study, Magnesium citrate had high solubility even in water (55%) and was substantially more soluble than Magnesium oxide in all states of acid secretion. It is commonly used and well-absorbed, making it a popular everyday choice. A short-term study found that 290 mg/day 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 (Bisglycinate)

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. This alternate absorption route may contribute to its gentler profile on the stomach. A 2025 trial found that 28 days of supplementation with 250 mg elemental Magnesium as Magnesium bisglycinate (with 1,523 mg glycine) resulted in modest but statistically significant improvements in insomnia severity index scores in adults with self-reported primary insomnia symptoms.

Key Takeaway

When weighing Magnesium citrate vs glycinate, consider your primary reason for supplementing. Research suggests Magnesium citrate's high solubility makes it an efficient general-purpose option, while Magnesium glycinate may be preferable for those who experience digestive sensitivity or who are looking for a form studied in the context of sleep support. Our naturopath is happy to walk you through the nuances in a free consultation.

Magnesium is required for energy production, oxidative phosphorylation, and glycolysis — processes that fuel virtually every cell in the body. It is a cofactor in more than 300 enzyme systems, necessary for protein synthesis, muscle and nerve function, blood glucose control, and blood pressure regulation.

Nervous System Support

Magnesium modulates neuronal excitability through voltage-gated Calcium antagonism and N-methyl-D-aspartate (NMDA) receptor blockade. Research suggests these mechanisms may support healthy nerve function, and Magnesium deficiency is associated with increased risk of neurological symptoms including numbness, tingling, and personality changes.

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 Function

Magnesium is essential for both skeletal and smooth muscle contraction and relaxation. Deficiency can lead to muscle cramps, fatigue, weakness, and cardiovascular abnormalities. Nature's Sunshine describes its Magnesium supplement as a muscle relaxant — a reflection of Magnesium's well-documented role in supporting healthy muscle tone.

Certain groups of people 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 proton pump inhibitors and loop or thiazide diuretics.

As we age, Magnesium absorption and retention can decrease, leading to deficiency and health consequences. Men older than 70 and teenage girls are among those most likely to have low intakes of Magnesium. The Recommended Dietary Allowance for adult men is 400–420 mg/day, while for adult women it is 310–320 mg/day.

Whether you lean toward citrate or glycinate in the Magnesium citrate vs glycinate discussion, the goal is the same: adequate daily Magnesium to support your nervous system, bones, and muscles. If you're unsure which form suits your situation, our naturopath offers free consultations and can help you sort through the options.

Take 1 tablet daily with a meal.

This Nature's Sunshine Magnesium product comes in 250 mg capsules of Magnesium oxide and Magnesium amino acid chelate in a base of Licorice root, Kelp plant, Peppermint leaves, and White willow bark. Each bottle contains 180 tablets.