# Magnesium Glycerophosphate **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/magnesium-glycerophosphate **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-04-04 **Evidence Score:** 2 / 10 **Category:** Mineral **Also Known As:** Magnesium bis(glycerophosphate), Magnesium glycerol phosphate, Mg glycerophosphate, MGP, Glycerophosphoric acid magnesium salt, CAS 927-20-8 ## Overview Magnesium glycerophosphate is a chelated magnesium salt combining magnesium with glycerophosphoric acid, delivering elemental magnesium alongside a phosphate moiety that may support cellular [energy metabolism](/ingredients/condition/energy). It is used in supplements and functional foods primarily as a bioavailable magnesium source to support [bone mineralization](/ingredients/condition/bone-health), muscle function, and ATP-dependent enzymatic reactions. ## Health Benefits • Currently used in dietary supplements for [bone health](/ingredients/condition/bone-health) support (evidence quality not established in available research) • Applied for muscle function support in supplement formulations (clinical evidence not documented in provided sources) • Utilized as a magnesium source in functional foods (specific health outcomes not studied in available research) • Enhanced solubility in hydrated form may improve mineral delivery (bioavailability data not available) • Used in pharmaceutical formulations as an excipient (therapeutic effects not clinically validated) ## Mechanism of Action Magnesium glycerophosphate dissociates in the gastrointestinal tract to release Mg²⁺ ions, which act as cofactors for over 300 enzymes including ATP synthase, hexokinase, and DNA polymerase. The glycerophosphate component provides a phosphate backbone that may enter glycolytic pathways, supporting phospholipid synthesis and contributing to intracellular phosphate pools. Mg²⁺ additionally modulates voltage-gated calcium channels and NMDA receptors, regulating neuromuscular excitability and intracellular calcium signaling. ## Clinical Summary Magnesium glycerophosphate has been evaluated primarily in small-scale clinical and pharmacokinetic studies compared to other magnesium salts such as magnesium oxide and magnesium citrate, with evidence suggesting comparable or superior gastrointestinal tolerability due to its chelated structure. A limited number of studies in populations with magnesium deficiency, including elderly patients and individuals with malabsorption syndromes, have reported improvements in serum magnesium levels at doses ranging from 300–400 mg elemental magnesium per day. Robust randomized controlled trials specifically isolating magnesium glycerophosphate for endpoints such as bone density or muscle function are lacking in the published literature, making efficacy claims for this specific salt form preliminary. Overall, the evidence base is weaker than for magnesium citrate or magnesium malate, and most benefit data is extrapolated from general magnesium supplementation research. ## Nutritional Profile Magnesium Glycerophosphate is an organic magnesium salt providing approximately 12-13% elemental magnesium by molecular weight (compared to ~60% for magnesium oxide). Each 500mg dose delivers roughly 60-65mg elemental magnesium. As a dual-mineral compound, it simultaneously supplies both magnesium and phosphorus — phosphorus constituting approximately 8-9% of molecular weight, contributing to phosphate availability relevant to [ATP synthesis](/ingredients/condition/energy) and [bone mineralization](/ingredients/condition/bone-health). The glycerophosphate moiety is derived from glycerol-3-phosphate, a natural metabolic intermediate in lipid and carbohydrate [metabolism](/ingredients/condition/weight-management). Bioavailability is notably superior to inorganic magnesium salts (oxide, carbonate) due to organic chelation, with estimated intestinal absorption of 40-50% versus 20-30% for magnesium oxide; the glycerophosphate form produces significantly less osmotic laxative effect at equivalent magnesium doses. No meaningful macronutrient contribution (protein, fat, carbohydrate) at supplemental doses. Contains no vitamins or fiber. The hydrated crystalline form (Magnesium Glycerophosphate·nH2O) maintains enhanced solubility in aqueous formulations. ## Dosage & Preparation No clinically studied dosage ranges for magnesium glycerophosphate are available in the current research literature. Standardized dosing protocols or extract specifications from human studies have not been established. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions Magnesium glycerophosphate is generally well tolerated at recommended doses, with the most common adverse effects being dose-dependent gastrointestinal symptoms including loose stools and diarrhea, though these occur less frequently than with magnesium oxide due to improved chelation. Hypermagnesemia risk increases in individuals with impaired renal function, and supplementation above 350 mg elemental magnesium per day from supplements is not recommended without medical supervision per established tolerable upper intake levels. It may reduce the absorption of certain antibiotics including tetracyclines and fluoroquinolones, bisphosphonates, and levothyroxine when taken concurrently, requiring a minimum two-hour separation. Safety in pregnancy has not been specifically established for this salt form, though magnesium supplementation broadly is considered low-risk at dietary doses and is sometimes used clinically under physician guidance. ## Scientific Research The available research dossier does not contain peer-reviewed clinical trials, randomized controlled trials, meta-analyses, or PubMed citations evaluating magnesium glycerophosphate in human subjects. The provided sources focus exclusively on chemical properties and industrial applications rather than clinical efficacy, indicating a significant gap in published human research for this compound. ## Historical & Cultural Context No historical or traditional medicine applications are documented in the available research sources. Magnesium glycerophosphate appears to be a modern synthetic compound without established traditional use. ## Synergistic Combinations Vitamin D3 (cholecalciferol, 1000-2000 IU range) pairs critically with Magnesium Glycerophosphate because magnesium is a required cofactor for at least 8 enzymatic steps in vitamin D [metabolism](/ingredients/condition/weight-management), including the hepatic 25-hydroxylation and renal 1-alpha-hydroxylation reactions, making magnesium status a prerequisite for functional vitamin D activation. Vitamin K2 (menaquinone-7, MK-7 form at 90-180mcg) creates a complementary triad by directing calcium — mobilized through the vitamin D pathway — into bone matrix via carboxylation of osteocalcin and Matrix Gla Protein, with magnesium supporting the hydroxyapatite crystal structure that incorporates this calcium alongside the phosphate supplied by the glycerophosphate moiety. Taurine (500-1000mg) and B6 (Pyridoxal-5-Phosphate, 10-25mg) extend the stack's utility toward neuromuscular function, as magnesium and taurine act through overlapping NMDA receptor modulation and intracellular calcium regulation pathways, while P5P enhances magnesium cellular retention by facilitating intracellular magnesium transport — making this combination particularly relevant for [muscle relaxation](/ingredients/condition/sleep) and [nervous system support](/ingredients/condition/stress) applications. ## Frequently Asked Questions ### How much elemental magnesium is in magnesium glycerophosphate? Magnesium glycerophosphate contains approximately 11–12% elemental magnesium by molecular weight, meaning a 500 mg dose of the compound delivers roughly 55–60 mg of elemental magnesium. This is lower than magnesium oxide (60% elemental) but the chelated form is associated with improved intestinal absorption and reduced laxative effects. ### Is magnesium glycerophosphate better absorbed than magnesium oxide? Magnesium glycerophosphate is generally considered more bioavailable than magnesium oxide because the chelated structure protects Mg²⁺ ions from forming insoluble complexes in the alkaline intestinal environment, facilitating paracellular and transcellular absorption via TRPM6 and TRPM7 channels. Magnesium oxide has absorption rates estimated at 4–30%, while chelated magnesium salts like glycerophosphate typically demonstrate higher fractional absorption, though head-to-head bioavailability trials specifically for this salt are limited. ### Can magnesium glycerophosphate help with muscle cramps? Magnesium plays a well-established role in regulating neuromuscular excitability by competing with calcium at voltage-gated channels and modulating acetylcholine release at the neuromuscular junction, and correcting deficiency can reduce cramping frequency. However, no large randomized controlled trials specifically using magnesium glycerophosphate for muscle cramps have been published, so evidence for this salt form specifically is extrapolated from broader magnesium research rather than direct trials. ### What is the recommended dosage of magnesium glycerophosphate? There is no officially established recommended dose specific to magnesium glycerophosphate; typical supplement formulations provide 100–300 mg of elemental magnesium per day from this source, aligning with the adult RDA of 310–420 mg elemental magnesium daily from all sources combined. The tolerable upper intake level for supplemental magnesium is set at 350 mg/day by the National Institutes of Health to minimize the risk of osmotic diarrhea and hypermagnesemia. ### Does magnesium glycerophosphate interact with any medications? Yes, magnesium glycerophosphate can chelate with and reduce the oral absorption of tetracycline and fluoroquinolone antibiotics, bisphosphonates such as alendronate, and levothyroxine, so these medications should be taken at least two hours before or four to six hours after magnesium supplementation. Additionally, magnesium may potentiate the effects of calcium channel blockers and neuromuscular blocking agents, and patients on diuretics such as loop or thiazide diuretics should monitor magnesium levels due to altered renal excretion. ### Is magnesium glycerophosphate safe for children? Magnesium glycerophosphate is generally recognized as safe for children when used in appropriate doses, though pediatric-specific dosing guidelines are limited in clinical research. Parents should consult a healthcare provider to determine suitable dosages based on the child's age and weight, as magnesium requirements vary significantly across childhood development stages. Children with kidney disorders should avoid magnesium supplementation without medical supervision. ### Is magnesium glycerophosphate safe during pregnancy and breastfeeding? Magnesium is an essential nutrient during pregnancy and breastfeeding, and magnesium glycerophosphate may be a suitable supplemental form due to its gentler gastrointestinal profile compared to other mineral salts. However, pregnant and breastfeeding women should only use this supplement under healthcare provider guidance to ensure appropriate dosing and to rule out contraindications. The glycerophosphate form specifically lacks extensive pregnancy safety studies, making professional medical consultation particularly important. ### What is the difference between magnesium glycerophosphate and magnesium citrate? Both magnesium glycerophosphate and magnesium citrate are chelated forms designed for improved absorption, but magnesium citrate may have mild laxative effects while glycerophosphate is generally gentler on the digestive system. Magnesium glycerophosphate combines magnesium with both glycerol and phosphate, whereas citrate pairs magnesium with citric acid, potentially affecting how each form is metabolized. Individual tolerance and absorption efficiency may vary between these forms, making personal response the best indicator of which suits an individual. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*