Product Introduction
Ascorbic Acid Coated Powder is a stabilized solid vitamin C preparation formed by uniformly coating high‑purity L‑ascorbic acid particles with food‑grade fatty acid ester via microencapsulation coating technology.
The hydrophobic coating physically isolates L‑ascorbic acid from oxygen, moisture, heat, and metal ions, thereby suppressing autoxidation and preserving reducing activity. Under neutral to weakly alkaline conditions or upon contact with lipid‑soluble matrices, the coating gradually disintegrates to release active ascorbic acid in a controlled manner. This mechanism improves stability during high‑temperature processing, tableting, extrusion, and long‑term storage, while maintaining consistent bioavailability and antioxidant function in finished formulations.
Core Advantages of Coated Vitamin C
- Superior Anti-Oxidation & Thermal Stability
Ordinary L-ascorbic acid is highly hygroscopic and prone to yellowing and activity loss after contacting air. Our microencapsulated fatty acid ester coating forms a waterproof and oxygen-isolated layer, which can withstand processing temperature up to 120°C without rapid degradation, perfectly solving the discoloration and activity attenuation problems of VC in high-temperature baking, tablet pressing and extrusion production.
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Controlled Slow Release & High Bioavailability
The fatty acid ester coating will slowly break down under neutral/weak alkaline environment or contact with oil-based matrix, stably release active ascorbic acid without sudden concentration burst. It retains the full antioxidant and collagen-promoting efficacy of vitamin C, avoiding gastrointestinal irritation caused by high-concentration free VC for oral supplements.
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Excellent Flowability for Direct Compression
Customized particle size (40–100 mesh) with uniform coating thickness, no agglomeration, good fluidity. It can be directly compressed into tablets without auxiliary adhesives, effectively reducing tablet capping, sticking and speckle defects during production, greatly improving production efficiency for supplement manufacturers.
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Full Global Certifications & Low Heavy Metal Residue
All batches pass strict internal full-item testing, heavy metals (Pb, As, Cd, Fe, Cu) are far below international regulatory limits. Certified with ISO9001, FSSC22000, Kosher, Halal, Non-GMO, Allergen-Free, Non-Irradiated, supporting global food, cosmetic and feed market registration.
Technical Specification
Each batch of coated ascorbic acid powder is accompanied with official COA test report; all indicators meet international pharmacopoeia and food additive standards:
| Item | Standard Limit | Test Result |
|---|---|---|
| Assay (dried basis) | 99.0–100.0% | 99.9% |
| Loss on Drying | ≤0.4% | 0.03% |
| Residue on Ignition | ≤0.1% | 0.03% |
| Specific Optical Rotation | +20.5° ~ +21.5° | +20.96° |
| pH (2% aqueous solution) | 2.4–2.8 | 2.6 |
| Heavy Metals (total) | ≤3 ppm | ≤3 ppm |
| Arsenic (As) | ≤1 ppm | <1 ppm |
| Lead (Pb) | ≤3 ppm | <3 ppm |
| Cadmium (Cd) | ≤1 ppm | ≤1 ppm |
| Iron (Fe) | ≤2 ppm | ≤2 ppm |
| Copper (Cu) | ≤5 ppm | ≤5 ppm |
| Oxalic Acid | ≤0.2% | <0.2% |
| Melting Point | 186–196 °C | Complies |
| Appearance | White to light yellow crystalline powder | Complies |
| Particle Size | Customizable (typical 40–100 mesh) | Complies |
Safety Profile
- Complies with USP, FCC, EP, and BP standards for ascorbic acid.
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Evaluated safe as a food additive (E300) and cosmetic raw material by JECFA, FDA, and CIR.
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Non‑irritating under intended use levels; no known sensitization.
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Excess ascorbic acid is renally excreted; acute toxicity is extremely low.
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Free of allergens, GMOs, irradiation, preservatives, or artificial colors.
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Heavy metals and toxic elements fully meet food, supplement, and cosmetic regulatory limits.
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MSDS and safety assessment reports available upon request.
Safety Profile & Global Certifications
Our coated ascorbic acid (E300) is recognized as safe food and cosmetic raw material by JECFA, FDA and CIR. Under recommended usage dosage, it is non-irritating and non-sensitizing; excess vitamin C will be excreted through human kidney with extremely low acute toxicity. The product contains no allergens, GMO components, irradiation treatment, artificial preservatives or synthetic pigments.
Available compliance documents upon request: COA, MSDS, Heavy Metal Test Statement, Anti-Doping Certificate, Kosher & Halal Certification, ISO & FSSC22000 Certificate.
Wide Application Fields of Coated Ascorbic Acid Powder
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Food & Beverage Industry
Applied in solid drink powder, instant juice powder, breakfast cereal, bakery fillings, fruit preserves. Function as natural antioxidant, prevent fruit browning, retain product color and extend shelf life. Compliance with local food additive maximum dosage regulations, only for oral food use, not for injection.
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Dietary Supplement Raw Material
Ideal raw material for VC tablets, chewable pills, effervescent powder, hard capsules. Stable under high-temperature tableting process, maintain long-term shelf activity without frequent discoloration. Support daily immune supplement formulations, follow human oral dosage guidelines.
- Cosmetic Skincare Raw Material
Topical brightening, anti-aging, anti-oxidation skincare ingredient. Slow-release active vitamin C boosts collagen synthesis, fades uneven skin tone, neutralize free radicals. Used in cream, lotion, serum, mask; only for external use, avoid eye contact.
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Animal Feed Premix
Add to livestock, poultry and aquafeed formulas to relieve animal stress response, maintain normal growth performance and immunity. Exclusively for animal nutrition, prohibited for human consumption.
Why Buy Coated Ascorbic Acid Powder from Dowell Ingredients?
- Proprietary Stabilized Coating Technology: Self-developed fatty acid ester microencapsulation process, adjustable coating thickness to match tableting, cosmetic and beverage demands, far better stability than ordinary market coated VC.
- Full In-House Strict QC Control: Complete testing lab from raw material incoming to finished product delivery, all impurity indicators controlled far below regulatory limits to avoid customer product disqualification.
- Global Authoritative Certifications: Complete ISO, FSSC22000, Kosher, Halal, Non-GMO certification system to meet EU, US, Southeast Asia market import inspection requirements.
- Stable Mass Production & Global Logistics: Large-scale factory production capacity, overseas warehouses in America, Europe and Southeast Asia, guarantee on-time bulk delivery for global distributors.
- Custom One-Stop Solutions: Flexible customization of particle mesh, coating proportion, VC assay content, packaging specification according to customer formulation needs, support sample trial before bulk order.
Frequently Asked Questions About Coated Ascorbic Acid Powder
Q1: What is the coating material of your stabilized vitamin C powder?
A: We adopt food-grade fatty acid ester as coating layer, which is safe and compliant for food, dietary supplement, cosmetic and animal feed applications, no toxic residue after decomposition.
Q2: How does coated VC improve stability vs uncoated ascorbic acid powder?
A: The hydrophobic fatty acid ester film isolates VC particles from oxygen, moisture, heat and metal ions, greatly slow down self-oxidation reaction, prevent yellowing and activity loss during high-temperature processing and long-term storage.
Q3: Can this coated ascorbic acid be used for direct compression tablet making?
A: Yes. Uniform particle size and good free-flow property eliminate tablet capping, sticking and speckle issues, suitable for direct tableting without extra flow aids.
Q4: What is the shelf life and recommended storage method?
A: 24 months shelf life when sealed and stored in cool dry environment away from sunlight and humidity. Do not open the package for long time to avoid moisture absorption.
Q5: Do you provide free samples for testing?
A: Yes, we support small trial samples for customer formulation test, you only need to bear the freight cost of sample delivery.
Delivery and Shipping Service
Storage: Store in a dry, cool, and well-ventilated place.
Packaging: 1 kg/bag, 25 kg/drum
Delivery Time: 7 days after order placement
1.Express Delivery
3-5 days for shipments under 100 kg
Door-to-door service
2.Ocean Freight
Over 300 kg: Approximately 30 days. Port-to-port service requires a professional customs clearance agent.
3.Air Freight
100kg-1000kg, 5-7 days
Airport-to-airport service, requires a professional customs clearance agent
Send inquiry or contact us to get free sample, and learn more details about it.
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