Brief Introduction to Zinc Citrate
Zinc is an essential trace mineral involved in over 300 enzymatic reactions. The body cannot store zinc, so daily intake is crucial. Zinc Citrate Dihydrate (CAS 5990-32-9) is the dihydrate form of the zinc salt of citric acid. It contains approximately 31% elemental zinc, has a neutral taste, and is gentle on the stomach-offering superior bioavailability compared to inorganic zinc salts like zinc sulfate or zinc oxide.
This organic zinc form supports immune function, skin health, wound healing, and cognitive function. It is ideal for dietary supplements, including capsules, tablets, gummies, powders, stick packs, and effervescent tablets. Our product is manufactured in a cGMP-certified facility, meeting USP, FCC, and EP standards, with complete documentation (COA, SDS, TDS) provided per shipment.
Physical & Chemical Parameters
| Parameter | Specification |
|---|---|
| Appearance | White to off-white fine crystalline powder |
| Odor | Odorless or practically odorless |
| Assay (Zinc Content, on dried basis) | ≥31.3% (USP standard) |
| Loss on Drying | ≤8.0% (for dihydrate, typically 6.0% – 8.0%) |
| pH (3% suspension) | 5.0 – 8.0 |
| Solubility | Slightly soluble in water (approx. 2.6 g/L at 20°C); soluble in dilute mineral acids and alkali hydroxides |
| Particle Size | 100% through 80 mesh; customizable |
| Bulk Density | 0.60 – 0.80 g/mL (typical) |
| Melting Point | 334°C (decomposition) |
Zinc Citrate benefits
- Supports Immune Function: Zinc is critical for immune cell development and activation, helping the body defend against pathogens.
- Promotes Healthy Skin: Helps reduce acne, supports wound healing, and regulates oil gland activity; also benefits healthy skin, hair, and nails.
- Enhances Antioxidant Defense: Acts as an antioxidant, protecting cells from oxidative stress.
- Aids in Wound Healing: Essential for tissue formation and repair, accelerating healing of minor wounds and cuts.
- Supports Cognitive Function: Contributes to normal cognitive function, sense of taste, smell, and vision.
- Supports Reproductive Health: Important for male reproductive health (testosterone production, sperm quality) and female reproductive health.
- Aids Protein Synthesis & Metabolism: Necessary for protein synthesis, nutrient metabolism, and carbohydrate utilization.
- Gentle on Stomach: Well-tolerated organic zinc form without the gastric irritation common with zinc sulfate or zinc oxide.
- Neutral Taste Profile: Minimal aftertaste, ideal for gummies, chewable tablets, and powder blends.
Zinc Citrate Uses
- Dietary Supplements: Capsules, tablets, softgels, gummies, powder blends, effervescent tablets, stick packs, oral drops
- Functional Foods: Nutritional bars, fortified dairy products, infant formulas, cereal-based products
- Beverage Fortification: Protein shakes, electrolyte drinks, powdered drink mixes, ready-to-drink beverages
- Pharmaceutical Preparations: Mineral supplements for zinc deficiency, pediatric formulations, prescription mineral therapies
- Oral Care Products: Toothpastes, mouthwashes (antimicrobial and anti-plaque effects)
- Cosmetics & Personal Care: Acne treatment creams, soothing lotions, anti-aging serums
Certificate of Analysis (COA)
Note: A representative COA for Zinc Citrate Dihydrate is shown below. Actual COA for each batch is provided upon shipment.
| Test Item | Specification | Typical Result |
|---|---|---|
| Appearance | White to off-white fine crystalline powder | Conforms |
| Identification (USP) | Positive for Zn and Citrate | Conforms |
| Zinc Content (on dried basis) | ≥31.3% | 31.8% |
| Loss on Drying | 6.0% – 8.0% | 7.2% |
| pH (3% suspension) | 5.0 – 8.0 | 6.4 |
| Chloride (Cl) | ≤0.05% | <0.02% |
| Sulfate (SO₄) | ≤0.05% | <0.02% |
| Lead (Pb) | ≤3.0 ppm | <0.5 ppm |
| Arsenic (As) | ≤1.0 ppm | <0.2 ppm |
| Cadmium (Cd) | ≤1.0 ppm | <0.1 ppm |
| Mercury (Hg) | ≤0.1 ppm | <0.05 ppm |
| Total Plate Count | ≤1,000 CFU/g | <100 CFU/g |
| Yeast & Mold | ≤100 CFU/g | <10 CFU/g |
| E. coli | Negative | Negative |
| Salmonella | Negative (per 25g) | Negative |
| Particle Size (80 mesh) | ≥95% through | 98% |
| Conclusion | - | Meets USP/FCC specifications |
Frequently Asked Questions (FAQ)
Q: What is the difference between Zinc Citrate Dihydrate (CAS 5990-32-9) and anhydrous Zinc Citrate (CAS 546-46-3)?
A: Zinc Citrate Dihydrate contains two molecules of water of crystallization (molecular weight 610.36 g/mol), while the anhydrous form does not contain water (molecular weight 574.34 g/mol). For dietary supplement applications, the dihydrate is more commonly used because it is the USP-recognized monograph form, offering consistent quality and flow properties.
Q: What is your MOQ? Can I order samples?
A: Our standard MOQ is 1 kg per product. Yes, free samples (20–50 g) are available upon request; shipping charges may apply for sample delivery.
Q: What certifications do you hold?
A: Our facility is certified with ISO 9001, cGMP, and HACCP. We operate from an FDA-registered facility and comply with international food safety standards.
Q: Is Zinc Citrate Dihydrate water-soluble?
A: It is slightly soluble in water (approx. 2.6 g/L at 20°C). For beverage applications where clear solutions are required, we recommend using a solubilizing agent such as potassium citrate.
Q: Is Zinc Citrate Dihydrate better absorbed than other zinc forms?
A: Zinc Citrate is considered a highly bioavailable organic zinc salt. It is generally preferred over inorganic forms like zinc oxide or sulfate due to better gastrointestinal tolerance.
Q: Do you offer custom specification adjustments or OEM formulations?
A: Yes. We offer OEM/ODM services, including custom particle size, custom packaging, and finished dosage form development. Please contact our sales team.
Our Advantages
Your Professional Manufacturing & Sourcing Partner
We are more than a supplier - we are a comprehensive supply chain partner dedicated to high-quality ingredients, custom formulations, and finished products across multiple industries.
Professional Expertise
With years of experience in plant extracts, food additives, cosmetic raw materials, and nutritional ingredients, our team brings deep technical knowledge and market insight to every partnership.
01. Diverse Product Range
We offer a broad range of products, including food additives, plant extracts, fruit & vegetable powders, cosmetic actives, and functional food ingredients.
02. One-Stop Shop
- Raw Materials: High-purity ingredients for food, beverage, supplement, and cosmetic applications.
- Finished Products: In-house manufacturing of capsules, softgels, gummies, liquid drops, and blended powders.
03. OEM/ODM/OBM Services
- Label Design & Packaging: Custom branding tailored to your target market.
- Formulation & R&D: Expert support to develop custom blends, proprietary formulas, and innovative products.
- Global Logistics: Reliable shipping, documentation, and customs clearance support.
04. Quality Assurance
Strict adherence to cGMP standards and full regulatory transparency. We stay current with global requirements, including FDA GRAS, EFSA, and other regional regulations, to ensure your products meet the highest safety and compliance standards.
How to contact
Contact our sales team to discuss your requirements for Zinc Citrate Powder.
Please get in touch with us at ella.zhang@huilinbio-tech.com.
Disclaimer: This product is solely for industrial production and formula development. All references to nutritional properties are derived from mainstream nutritional research and shall not be regarded as medical advice for diagnosing, treating, curing or preventing any illnesses. Regulatory requirements differ across regions. Purchasers shall take full responsibility for complying with local applicable laws and regulations.
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