Calcium Ascorbate Anhydrous

Calcium ascorbate anhydrous is a mineral salt of ascorbic acid (vitamin C) delivering approximately 90% ascorbic acid and 10% elemental calcium in a water-free, buffered form. It functions as a non-acidic antioxidant that donates electrons to neutralize reactive oxygen species while supporting collagen biosynthesis via prolyl and lysyl hydroxylase enzyme activation.

Origin & History

Calcium Ascorbate Anhydrous is the anhydrous calcium salt of ascorbic acid (vitamin C) with molecular formula C₁₂H₁₄CaO₁₂, classified as a mineral ascorbate and butenolide derivative. It is produced synthetically by reacting ascorbic acid with calcium carbonate in water at controlled conditions (50°C with CO₂ coverage), followed by crystallization with methanol and drying to yield a white, crystalline powder. The ascorbic acid component is typically manufactured industrially from glucose via fermentation and chemical processes.

Historical & Cultural Context

No historical or traditional medicine uses are documented in the research for calcium ascorbate anhydrous. It is primarily a modern synthetic compound developed for use as a food additive and dietary supplement. The compound lacks traditional usage in systems like Ayurveda or TCM.

Health Benefits

• Provides buffered vitamin C (90% content) for antioxidant support without gastric irritation - evidence quality: theoretical based on composition
• Supplies elemental calcium (10% content) for bone health support - evidence quality: theoretical based on composition
• Supports collagen production and tissue interstitial matrix formation - evidence quality: mechanistic understanding only
• Aids in neurotransmitter synthesis and amino acid metabolism - evidence quality: mechanistic understanding only
• Enhances immune function through vitamin C activity - evidence quality: inferred from general vitamin C properties

How It Works

Ascorbic acid from calcium ascorbate acts as a cofactor for prolyl-4-hydroxylase and lysyl hydroxylase, enzymes essential for hydroxylating proline and lysine residues during collagen triple-helix stabilization. The ascorbate anion also regenerates oxidized alpha-tocopherol (vitamin E) and directly scavenges superoxide, hydroxyl radicals, and singlet oxygen, reducing oxidative stress markers such as 8-isoprostane. The calcium component dissociates in solution and is absorbed via TRPV6 calcium channels and the paracellular route in the small intestine, contributing to intracellular signaling and hydroxyapatite mineralization in bone.

Scientific Research

The research dossier reveals no specific human clinical trials, RCTs, or meta-analyses on calcium ascorbate anhydrous. No PubMed PMIDs are provided in the available literature. General literature on ascorbate salts implies equivalent efficacy to ascorbic acid due to similar bioavailability, but no dedicated studies are cited.

Clinical Summary

Direct clinical trials on calcium ascorbate anhydrous as a distinct form are sparse; most evidence is extrapolated from studies on ascorbic acid and calcium supplementation independently. Vitamin C research, including a Cochrane review of over 30 trials, demonstrates that gram-level ascorbic acid supplementation reduces common cold duration by approximately 8% in adults. Buffered vitamin C forms like calcium ascorbate are theorized to reduce gastrointestinal distress compared to ascorbic acid, but head-to-head randomized controlled trials confirming superior GI tolerability at matched doses are limited. The calcium contribution (~100 mg elemental calcium per 1,000 mg supplement) is modest relative to the 1,000–1,200 mg daily recommended intake, making it a supplementary rather than primary calcium source.

Nutritional Profile

Calcium Ascorbate Anhydrous is a mineral salt form of vitamin C with a precise compositional profile: approximately 890-910 mg ascorbic acid equivalent per gram (89-91% w/w ascorbate ion) and approximately 100-114 mg elemental calcium per gram (10-11.4% w/w calcium). As an anhydrous form, it contains no bound water molecules, yielding a higher active compound density compared to the monohydrate form. It is a pure compound with no macronutrient content (zero protein, fat, or carbohydrate in functional quantities). The primary bioactive compounds are the ascorbate anion (the biologically active form of vitamin C) and calcium cation. Bioavailability notes: The buffered pH (approximately 6.8-7.4 in solution) makes it less acidic than pure ascorbic acid, potentially improving gastric tolerance at higher doses; ascorbate bioavailability is comparable to ascorbic acid at standard doses (approximately 70-90% absorption at doses under 200 mg), declining with increasing dose due to saturation of sodium-dependent vitamin C transporters (SVCT1, SVCT2). Calcium bioavailability from this form is estimated at 25-35%, consistent with other soluble calcium salts, and is absorption-dependent on vitamin D status, gastric acid presence, and co-ingestion of competing divalent minerals (e.g., zinc, iron, magnesium). No dietary fiber, no phytochemicals, no lipid-soluble vitamins present.

Preparation & Dosage

No clinically studied dosage ranges for calcium ascorbate anhydrous are detailed in the available research. The compound provides approximately 10% elemental calcium and 90% vitamin C by weight, and is often used as a food additive without quantified therapeutic standardization. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Bioflavonoids, Vitamin D3, Magnesium, Zinc, Collagen peptides

Safety & Interactions

Calcium ascorbate anhydrous is generally well tolerated, but doses of ascorbic acid exceeding 2,000 mg/day (the established Tolerable Upper Intake Level) may cause osmotic diarrhea, nausea, and kidney oxalate stone formation in susceptible individuals. The calcium component can interact with bisphosphonates (e.g., alendronate), levothyroxine, and certain fluoroquinolone antibiotics by reducing their absorption when co-administered; a 2-hour separation is recommended. High-dose vitamin C may interfere with warfarin anticoagulation and can falsely lower blood glucose readings on certain glucometer test strips. Calcium ascorbate is considered low-risk during pregnancy at doses within the 85–120 mg/day ascorbic acid RDA, though megadose supplementation should be avoided without medical supervision.