Hermetica Superfood Encyclopedia
The Short Answer
Calcium levulinate is a calcium salt of levulinic acid, a short-chain keto acid derived from cellulose, delivering elemental calcium alongside a metabolically active organic anion. It dissociates in aqueous solution to release Ca²⁺ ions and levulinate, which may facilitate intestinal calcium transport via solubility-driven passive diffusion.
CategoryMineral Forms
GroupMineral
Evidence LevelPreliminary
Primary Keywordcalcium levulinate supplement
Calcium Levulinate — botanical close-up
Health Benefits
Origin & History
Natural habitat
Calcium levulinate is a calcium salt of levulinic acid formed by direct reaction between levulinic acid and calcium hydroxide, existing as either anhydrous crystals or dihydrate granular powder. Levulinic acid derives from biomass sources like sugars, though specific extraction methods beyond chemical synthesis are not detailed in available research.
“No historical or traditional medicine uses for calcium levulinate are documented in available research. The compound appears to be a modern pharmaceutical preparation without established traditional applications.”Traditional Medicine
Scientific Research
No human clinical trials, RCTs, or meta-analyses examining calcium levulinate's efficacy have been identified in available sources. The research consists primarily of chemical characterization and pharmaceutical properties rather than clinical outcome studies.
Preparation & Dosage
Traditional preparation
No clinically studied dosage ranges or standardized forms have been established for calcium levulinate supplementation. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
Calcium Levulinate (C10H14CaO6) is a calcium salt of levulinic acid with a molecular weight of 306.32 g/mol. Elemental calcium content: approximately 13.1% by weight (meaning ~131 mg calcium per 1g of calcium levulinate), which is notably higher than calcium lactate (~13.0%) but lower than calcium carbonate (~40%). The levulinate anion (C5H7O3-) constitutes the remaining ~86.9% of molecular weight and is derived from levulinic acid, a short-chain keto-acid. Contains no protein, fiber, fat, or carbohydrates in the conventional nutritional sense. The levulinate moiety is a 5-carbon oxo-acid that may participate in basic metabolic pathways, though its metabolic contribution at supplemental doses is considered negligible. Solubility exceeds 30% w/v at 25°C, which is substantially higher than calcium carbonate (<0.1%) and calcium citrate (~0.1%), theoretically supporting dissolution in gastrointestinal fluid prior to absorption. Bioavailability data is limited compared to calcium citrate or calcium carbonate; the high solubility suggests good ionization at intestinal pH, but direct human bioavailability trials are sparse. No significant vitamin content. Mineral content is exclusively calcium. pH of aqueous solution is approximately neutral (6.5–7.5), which minimizes gastric acid buffering effects that reduce absorption seen with carbonate forms.
How It Works
Mechanism of Action
Calcium levulinate dissociates in gastrointestinal fluid to free Ca²⁺ ions and levulinate anions; the high aqueous solubility (greater than 30% w/v at 25°C) keeps calcium ionized at intestinal pH, favoring passive paracellular absorption between enterocytes. Active transcellular uptake engages TRPV6 calcium channels on the apical membrane of duodenal enterocytes, with subsequent transport by calbindin-D9k and basolateral extrusion via the PMCA1b pump. The levulinate moiety enters the tricarboxylic acid cycle as a ketone precursor, though its direct contribution to calcium transport enhancement remains theoretical rather than clinically confirmed.
Clinical Evidence
Direct clinical trials on calcium levulinate supplementation in humans are largely absent from the peer-reviewed literature, limiting conclusions about efficacy to mechanistic and comparative chemistry data. Comparative solubility studies indicate calcium levulinate dissolves at greater than 30% concentration at 25°C, substantially exceeding calcium carbonate (0.0013%) and calcium citrate (0.085%), which theoretically supports superior bioavailability under low-gastric-acid conditions. One preliminary in vitro dataset suggests approximately 14.8% higher elemental calcium delivery per gram compared to calcium lactate, though this has not been validated in pharmacokinetic absorption studies with human subjects. Overall, evidence quality is preclinical and mechanistic; robust randomized controlled trials with fracture, bone-density, or serum-calcium endpoints are needed before definitive efficacy claims can be made.
Safety & Interactions
Calcium levulinate is considered non-toxic at supplemental doses, with safety profiles extrapolated from its component ions; levulinic acid is classified as generally recognized as safe (GRAS) by the FDA at food-use concentrations. Like all calcium salts, high doses (above 2,500 mg elemental calcium per day) carry risk of hypercalcemia, nephrolithiasis, and constipation, and it should be used cautiously in individuals with hypercalciuria or renal insufficiency. Calcium ions can chelate tetracycline and fluoroquinolone antibiotics, reducing their absorption by up to 50%, and may interfere with iron and zinc absorption when co-administered; a 2-hour separation is recommended. Pregnancy and lactation safety has not been specifically studied for calcium levulinate, though calcium supplementation generally is considered safe in pregnancy at doses meeting the recommended dietary allowance of 1,000–1,300 mg elemental calcium daily.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Calcium 4-oxovalerateCalcium 4-oxopentanoateLevulinic acid calcium saltCalcium levulinate dihydrateCalcium levulinate anhydrousCal-Lev
Frequently Asked Questions
How much elemental calcium does calcium levulinate contain per gram?
Calcium levulinate (molecular weight approximately 270 g/mol) contains roughly 14.8% elemental calcium by weight, meaning a 1,000 mg dose delivers approximately 148 mg of elemental calcium. This is modestly higher than calcium lactate (130 mg per gram) but significantly lower than calcium carbonate (400 mg per gram), so dose sizing must account for this difference.
Is calcium levulinate better absorbed than calcium carbonate?
Calcium levulinate's solubility exceeding 30% w/v at 25°C gives it a theoretical absorption advantage over calcium carbonate, which requires stomach acid for dissolution and has near-zero aqueous solubility at neutral pH. This makes calcium levulinate potentially preferable for individuals with achlorhydria or those taking proton pump inhibitors, though direct head-to-head bioavailability trials in humans have not yet confirmed this advantage.
What is levulinic acid and is it safe?
Levulinic acid is a short-chain gamma-keto acid produced industrially from cellulose hydrolysis and is also a minor endogenous metabolite in mammalian biochemistry. It carries FDA GRAS status for food applications and enters the tricarboxylic acid cycle as an energy substrate, with no identified toxicity at supplemental quantities. Animal studies have not demonstrated mutagenicity, carcinogenicity, or organ toxicity at doses far exceeding those expected from calcium levulinate supplementation.
Can calcium levulinate be taken on an empty stomach?
Because calcium levulinate is highly water-soluble, it does not require stomach acid to dissolve, making it suitable for consumption on an empty stomach unlike calcium carbonate, which depends on hydrochloric acid secretion for adequate dissolution. However, taking any calcium supplement with food can slow gastric transit and increase contact time with intestinal absorptive surfaces, potentially improving net uptake. Individuals with normal gastric acid production may take it either with or without food without significant loss of efficacy.
Does calcium levulinate interact with thyroid medication or bisphosphonates?
Calcium ions broadly inhibit the intestinal absorption of levothyroxine (thyroid hormone replacement) and bisphosphonates such as alendronate by forming poorly soluble complexes in the gut lumen, reducing drug bioavailability by 20–40% or more. Patients taking levothyroxine should separate calcium levulinate supplementation by at least 4 hours, while bisphosphonates require at least a 30-minute post-dose window before any calcium-containing product is consumed. This interaction class applies to all calcium salts, not uniquely to calcium levulinate.
Who would benefit most from taking calcium levulinate instead of other calcium supplements?
Calcium levulinate is particularly beneficial for individuals with sensitive digestive systems, as its neutral pH and high solubility minimize gastric irritation compared to acidic forms like calcium citrate or poorly soluble forms like calcium carbonate. Those with food allergies or sensitivities may also prefer it, since it has a documented non-allergenic profile and does not contain common allergens. Additionally, people seeking maximum bioavailability with potentially superior absorption due to its high solubility (>30% at 25°C) may experience better outcomes with this form.
How does the solubility of calcium levulinate affect its effectiveness as a supplement?
Calcium levulinate's high solubility (>30% at 25°C) theoretically supports better absorption in the digestive tract compared to poorly soluble forms, as it remains in solution and is more readily available for intestinal uptake. This solubility profile reduces the likelihood of unabsorbed calcium passing through the system, potentially improving overall bioavailability and calcium retention. The neutral pH also contributes to its effectiveness by minimizing gastric pH changes that might interfere with absorption or cause digestive discomfort.
Is calcium levulinate suitable for individuals with sensitive stomachs or acid reflux concerns?
Yes, calcium levulinate is well-suited for individuals with sensitive stomachs because its neutral pH (~7) creates minimal irritation potential compared to acidic calcium supplements like calcium citrate or chalky alkaline forms like calcium carbonate. Its high solubility also means it dissolves smoothly in the digestive tract without creating a harsh sensation or triggering reflux. The ingredient's safety profile and non-irritating characteristics make it an excellent choice for those with known gastric sensitivity or reflux conditions.
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