Calcium Ascorbate (Buffered Vitamin C) – Gentle, Bioavailable Source of Vitamin C for Cosmetics, Dietary Supplements & Functional Foods
CAS No.: 5743-28-2
Synonyms: Buffered Vitamin C, Calcium Salt of Ascorbic Acid
Molecular Formula: C₁₂H₁₄CaO₁₂
Molecular Weight: 426.31
Origin: Natural fermentation-derived ascorbic acid combined with high-purity calcium carbonate from mineral sources
Manufacturer: Shaanxi Zhonghong Investment Technology Co., Ltd. (AiHerba®)
Email: sales@aiherba.com | info@aiherba.com
🧪 1. Product Overview | Professional Introduction
Calcium Ascorbate is a non-acidic, buffered form of Vitamin C designed for gentle, stable, and highly bioavailable antioxidant support.
It is widely used as a functional food ingredient, dietary supplement raw material, and cosmetic antioxidant, ideal for customers seeking natural, stable, and stomach-friendly vitamin sources in nutraceuticals, beauty formulas, and pharmaceutical preparations.
Applications across industries
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Cosmetic Ingredients: Antioxidant whitening creams, anti-aging serums, vitamin C skin-repair masks
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Dietary Supplements: Immune-support tablets, chewable calcium + vitamin C combinations
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Functional Food & Beverages: Fortified drinks, fruit powders, instant functional beverages
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Pharmaceuticals: Buffered vitamin C injectables, antioxidant adjunct formulations
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Natural Plant Extract Blends: Works synergistically with herbal antioxidants such as ellagic acid, polyphenols, and anthocyanins
🌱 2. Product Source | Origin & Manufacturing
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Raw Material Origin: Fermentation-derived ascorbic acid from non-GMO glucose, neutralized with purified calcium carbonate.
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Manufacturing Experience: Produced in Shaanxi Zhonghong’s GMP-certified plant with 20 + years of nutraceutical and botanical extract experience.
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From Farm to Finished Product: Complete traceability system ensuring purity, safety, and consistency in every batch.
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Customer Experience: Used by supplement brands in over 40 countries; feedback confirms excellent taste, solubility, and stability in formulations.
💪 3. Health Benefits & Functional Advantages
| Functional Area | Health Benefit | Application |
|---|---|---|
| Immune Support | Enhances natural immunity through antioxidant protection | Dietary supplements, fortified foods |
| Collagen Synthesis | Promotes skin firmness and elasticity | Beauty & cosmetic formulas |
| Antioxidant Defense | Neutralizes free radicals, reduces oxidative stress | Nutraceuticals, functional drinks |
| Bone and Joint Health | Provides dual calcium + Vitamin C nutrition | Supplements, fortified beverages |
| Food Preservation | Natural antioxidant, prevents color and flavor degradation | Functional foods, natural colorant blends |
🧴 4. Usage Guidelines & Recommended Formulation
Recommended Daily Intake:
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Adults: 500 – 1000 mg per day (Vitamin C equivalent)
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Children: 250 mg per day under supervision
Formulation Suggestions:
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Cosmetic products: 0.1 – 1 % in serums/lotions (pH 6–7)
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Food & beverage: 0.2 – 1 % as antioxidant or fortifying agent
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Tablets / capsules: Equivalent to 100 – 500 mg Vitamin C per serving
Traditional Applications:
Historically, buffered Vitamin C was used to support wound healing, scurvy prevention, and immune function, now extended to skin brightening and anti-aging formulas in modern nutraceutical science.
⚠️ 5. Precautions
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Avoid excess dosage (> 2000 mg Vitamin C equivalent per day).
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Consult a physician during pregnancy or if using prescription drugs.
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Store in a cool, dry place away from light and moisture.
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Keep sealed after opening to prevent oxidation.
📋 6. Product Specifications & Quality Data (COA Summary)
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | White to off-white crystalline powder | Visual |
| Identification | Positive | USP / EP |
| Assay (Ascorbate) | ≥ 97.0 % | HPLC |
| Calcium Content | 9 – 11 % | Titration |
| pH (10 % solution) | 6.5 – 8.0 | USP |
| Loss on Drying | ≤ 0.25 % | USP |
| Particle Size | 80–100 mesh | Sieve |
| Shelf Life | 24 months | Stability Test |
🧫 Pesticide Residues
| Project Name | Limit ( mg/kg ) | Test Method |
|---|---|---|
| DDT | ≤ 0.05 | GC-MS |
| BHC (γ-HCH) | ≤ 0.02 | GC-MS |
| Parathion | ≤ 0.05 | GC-MS |
| Malathion | ≤ 0.5 | GC-MS |
| Chlorpyrifos | ≤ 0.5 | GC-MS |
⚗️ Heavy Metals
| Project Name | Limit ( ppm ) | Test Method |
|---|---|---|
| Lead (Pb) | ≤ 2.0 | ICP-MS |
| Arsenic (As) | ≤ 1.0 | ICP-MS |
| Cadmium (Cd) | ≤ 1.0 | ICP-MS |
| Mercury (Hg) | ≤ 0.1 | ICP-MS |
🧫 Microbiological Tests
| Project Name | Limit | Test Method |
|---|---|---|
| Total Plate Count | ≤ 1000 cfu/g | USP |
| Yeast & Mold | ≤ 100 cfu/g | USP |
| E. coli | Negative | USP |
| Salmonella | Negative | USP |
| Staphylococcus aureus | Negative | USP |
🧭 7. Certifications & Authoritativeness
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Quality Systems: ISO 9001, GMP, HACCP, Halal, Kosher
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Third-Party Testing: SGS / Eurofins certified
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Regulatory Compliance: USP / EP / FCC standards
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Referenced Regulatory Documents:
🧰 8. Packaging & OEM Services
| Service | Description |
|---|---|
| Standard Packaging | 25 kg fiber drum with inner PE liner |
| Custom Packaging | 1 kg–25 kg bags / private label options |
| OEM / ODM Support | Custom blend formulas (e.g., Vitamin C + Zinc + Herbal Extracts) |
| Documentation | COA, MSDS, TDS available upon request |
| Shipping Lead Time | 7 – 15 days depending on quantity |
🔍 9. Trust & Transparency
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Verified Manufacturer: Shaanxi Zhonghong Investment Technology Co., Ltd., est. 2004
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Factory Address: Xi’an High-Tech Industrial Development Zone, Shaanxi, China
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Traceability: Each batch coded for production date, COA no., and inspection result
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Visual Verification: Factory images and videos available on aiherba.com/about-us
🧑🔬 10. Author & Review Section
Author: Dr. Liao Daohai – Senior Phytochemical Researcher, AiHerba R&D Center
Reviewed by: QC Department (GMP Certified Laboratory)
Last Updated: October 2025
Citation Format: Shaanxi Zhonghong R&D Team, 2025, “Calcium Ascorbate Specification & Applications Report.”
💬 11. FAQ – Structured Data Ready
Q1: Is Calcium Ascorbate better than Ascorbic Acid for sensitive stomachs?
→ Yes, it is non-acidic and gentle, ideal for sensitive digestive systems.
Q2: Can it be used in cosmetic formulations?
→ Yes, it acts as an antioxidant and skin-brightening agent compatible with neutral pH systems.
Q3: Is it natural and safe for long-term use?
→ Yes, produced from fermentation-derived ascorbic acid and tested for heavy metals and microbes per USP standards.
Q4: Do you offer OEM formulations with herbal extracts?
→ Yes, we can blend Calcium Ascorbate with botanical extracts like Green Tea, Grape Seed, and Goji Berry for custom nutraceutical products.
