# Calcium Glycerophosphate **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/calcium-glycerophosphate **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-28 **Evidence Score:** 2 / 10 **Category:** Mineral **Also Known As:** Calcium 2,3-dihydroxypropyl phosphate, Calcium glycerol phosphate, CaGP, Glycerol calcium phosphate, Calcium α-glycerophosphate, Calcium DL-glycerophosphate ## Overview Calcium glycerophosphate is a calcium salt of glycerophosphoric acid that simultaneously delivers bioavailable calcium and phosphate ions upon dissociation in aqueous environments. Its primary mechanism in dental health involves elevating calcium and phosphate concentrations in salivary plaque fluid, buffering acid-induced pH drops and inhibiting enamel demineralization. ## Health Benefits • Dental health support through cariostatic effects - limited evidence suggests elevation of calcium and phosphate in plaque for pH buffering (preliminary evidence from Caries Res. 14, 210, 1980) • Electrolyte replacement providing bioavailable calcium and phosphate ions (preliminary evidence, no clinical trials cited) • Potential [bone health](/ingredients/condition/bone-health) support through improved calcium incorporation compared to other calcium salts (mechanism suggested but no clinical evidence provided) • pH buffering in oral cavity through direct interaction with dental minerals (preliminary evidence only) • Higher bioavailability than calcium phosphate due to increased solubility (chemical property, no clinical validation) ## Mechanism of Action Upon ingestion or topical application, calcium glycerophosphate dissociates into Ca²⁺ ions and glycerophosphate, with alkaline phosphatase subsequently hydrolyzing glycerophosphate to release inorganic phosphate (Pi). The elevated Ca²⁺ and Pi concentrations in plaque fluid shift the hydroxyapatite solubility equilibrium, suppressing acid-driven dissolution of enamel mineral at the tooth surface. Additionally, the phosphate moiety acts as a pH buffer, neutralizing lactic acid produced by cariogenic bacteria such as Streptococcus mutans, thereby reducing the cariogenic challenge at the enamel interface. ## Clinical Summary A foundational in vitro study published in Caries Research (1980, vol. 14, p. 210) demonstrated that calcium glycerophosphate elevates calcium and phosphate levels in dental plaque, providing a cariostatic buffering effect, though human clinical trial data remain sparse. Small-scale human studies and animal models have shown reductions in enamel lesion depth and plaque acidogenicity with topical calcium glycerophosphate application, but sample sizes have generally been under 50 participants, limiting statistical power. As an oral electrolyte supplement, calcium glycerophosphate is used to reduce urinary calcium oxalate and calcium phosphate supersaturation in patients with interstitial cystitis, with preliminary evidence suggesting symptom relief, though randomized controlled trial data are limited. Overall, the evidence base is preliminary to moderate; no large Phase III RCTs have definitively established efficacy thresholds for any indication. ## Nutritional Profile Calcium Glycerophosphate (CaC3H7O6P) is a mineral salt compound providing two key micronutrients per molecule: calcium (~17-18% by molecular weight, approximately 170-180mg calcium per gram of compound) and phosphate (~15-16% phosphorus by molecular weight, approximately 150-160mg phosphorus per gram). No macronutrient contribution (0g protein, 0g fat, 0g carbohydrate in functional dosing ranges). No fiber, no vitamins. Typical functional doses range from 0.1-0.5g per serving in food/supplement applications, delivering approximately 17-90mg calcium and 15-80mg phosphorus per serving. Bioavailability: calcium from glycerophosphate is considered moderately to highly bioavailable, with the glycerophosphate ligand facilitating solubility at neutral and slightly acidic pH compared to calcium carbonate or calcium phosphate salts; the phosphate moiety dissociates readily in aqueous solution providing free inorganic phosphate ions. The glycerol backbone (glycerophosphate portion) contributes negligible caloric value at functional doses (less than 1 kcal per typical dose). Solubility is notably higher than calcium carbonate (~5g/L vs ~0.013g/L at 25°C), which is a key bioavailability advantage. No significant secondary bioactive compounds present. ## Dosage & Preparation No clinically studied dosage ranges are available in the research literature. The compound is used as an electrolyte replacement but specific doses have not been established through clinical trials. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions Calcium glycerophosphate is generally recognized as safe at supplemental doses, with adverse effects primarily limited to gastrointestinal discomfort, constipation, or flatulence at high calcium intakes exceeding 2,500 mg elemental calcium per day. Concurrent use with tetracycline or fluoroquinolone antibiotics may impair antibiotic absorption due to chelation by calcium ions, and doses should be separated by at least two hours. Patients with hypercalcemia, hypercalciuria, nephrolithiasis, or renal impairment should use calcium-containing supplements cautiously and under medical supervision, as elevated serum calcium can exacerbate these conditions. Pregnancy safety is considered acceptable at recommended dietary calcium levels (1,000–1,300 mg/day elemental calcium), but high-dose supplementation beyond established upper intake levels has not been adequately studied in pregnant populations. ## Scientific Research The research dossier reveals a significant lack of published human clinical trials, with calcium glycerophosphate only reaching Phase I clinical trials and having one investigational indication. No PubMed PMIDs or meta-analyses were identified, and the only reference cited (Caries Res. 14, 210, 1980) lacks detail on study design, sample size, or outcomes. ## Historical & Cultural Context No historical context or traditional medicine uses were identified in the research. The compound appears to be a modern synthetic preparation without documented use in traditional systems like Ayurveda or TCM. ## Synergistic Combinations Vitamin D3, Magnesium glycinate, Vitamin K2, Phosphorus, Citric acid ## Frequently Asked Questions ### How does calcium glycerophosphate protect teeth from cavities? Calcium glycerophosphate elevates free Ca²⁺ and inorganic phosphate concentrations in dental plaque fluid, shifting the hydroxyapatite dissolution equilibrium toward remineralization rather than demineralization. Alkaline phosphatase cleaves the glycerophosphate moiety to release additional Pi, which buffers lactic acid produced by Streptococcus mutans, keeping plaque pH above the critical threshold of approximately 5.5 where enamel dissolution accelerates. ### What is the elemental calcium content of calcium glycerophosphate? Calcium glycerophosphate (molecular weight approximately 210 g/mol) contains roughly 19% elemental calcium by weight, meaning a 500 mg dose delivers approximately 95 mg of elemental calcium. This is lower than calcium carbonate (~40% elemental calcium) but the compound also co-delivers phosphate, which provides additional mineral support for bone and dental tissue beyond calcium alone. ### Can calcium glycerophosphate help with interstitial cystitis symptoms? Calcium glycerophosphate is used as a dietary alkalinizing agent in interstitial cystitis management under the brand name Prelief, with the rationale that dietary phosphate buffers urinary acidity and reduces bladder irritation triggered by acidic foods. Preliminary observational data and patient-reported outcomes suggest symptom reduction in some individuals, though rigorous randomized controlled trial evidence is lacking and the mechanism of symptom relief beyond urinary pH modulation is not fully characterized. ### Is calcium glycerophosphate better absorbed than calcium carbonate? Calcium glycerophosphate does not require gastric acid for dissolution, unlike calcium carbonate which depends on low gastric pH for adequate ionization, making it potentially advantageous for individuals using proton pump inhibitors or H2 blockers or those with achlorhydria. However, head-to-head bioavailability studies directly comparing calcium glycerophosphate to calcium carbonate in humans are limited, and calcium citrate also shares acid-independent solubility with stronger comparative data available. ### What is the typical dosage of calcium glycerophosphate used in dental studies? In vitro and early human dental studies have applied calcium glycerophosphate topically at concentrations of 0.5–2.0% in mouth rinses, toothpastes, or chewing gum formulations, though standardized clinical dosing protocols have not been established due to the preliminary nature of the evidence. As an oral dietary supplement for electrolyte or antacid purposes, doses typically provide 50–200 mg of elemental calcium per serving, with total daily calcium intake from all sources advised to remain under the tolerable upper intake level of 2,500 mg for adults. ### Does calcium glycerophosphate interact with antibiotics or bisphosphonates? Calcium glycerophosphate may reduce the absorption of certain antibiotics (such as tetracyclines and fluoroquinolones) and bisphosphonates when taken simultaneously, as calcium can chelate these medications in the gastrointestinal tract. It is generally recommended to separate calcium glycerophosphate supplementation from these medications by at least 2 hours to minimize interaction potential. Consult with a healthcare provider before combining calcium glycerophosphate with prescription medications, particularly those with narrow therapeutic windows. ### Is calcium glycerophosphate safe for children and pregnant women? While calcium glycerophosphate is a food-grade ingredient found in dental products and supplements, safety data specifically in pregnant women and children are limited. Pregnant women should consult their healthcare provider before supplementing, as excessive calcium intake may have implications for fetal development and maternal health. For children, calcium glycerophosphate in small amounts from toothpastes is generally considered safe, but supplemental forms require pediatric guidance based on age-appropriate dosing. ### What is the current strength of clinical evidence supporting calcium glycerophosphate for bone health? The evidence for calcium glycerophosphate specifically supporting bone health remains preliminary and limited, with most available research dating from the 1980s and primarily focused on dental applications rather than skeletal mineralization. No large-scale, well-controlled clinical trials in humans have directly compared calcium glycerophosphate to standard calcium supplements for bone density or fracture prevention. Most practitioners recommend established calcium forms with stronger clinical evidence (such as calcium citrate or malate) for primary bone health support until more modern human trials become available. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*