How to choose a supplier of food-grade sodium gluconate and calcium gluconate? A procurement guide from the source factory of nutritional fortifiers.

Food-grade sodium gluconate and calcium gluconate are commonly used ingredients in the food, health‑care, and feed industries for nutritional fortification and pH adjustment. In formulations for beverages, dairy products, soy‑based foods, breakfast cereals, and dietary supplements, they serve to fortify with minerals such as calcium, iron, and zinc, while also providing buffering, gelling, and chelating functions. For food manufacturers, nutritional‑supplement brands, feed producers, and import distributors, the ability to source the entire range of gluconates from a single primary manufacturer—along with compliant test reports and certification—is critical to formulation stability and customs‑clearance efficiency.

Shandong Definly Chemical Co., Ltd. (brand: Definly Chemical) is a Chinese manufacturer with 20 years of expertise in the gluconate series and construction chemicals. Its proprietary production base is Shandong Zhuozhicheng Biotechnology. Ninety-nine percent of its products are exported to more than 80–100 countries and regions worldwide, with key markets spanning Turkey, India, Vietnam, the Middle East, and the European Union, while it continues to expand into the U.S. market.

I. Main Products and Applicable Standards of the Food-Grade Gluconate Series

Defengli’s food-grade line encompasses calcium gluconate, ferrous gluconate, zinc gluconate, magnesium gluconate, copper gluconate, and glucono‑δ‑lactone (GDL), complying with Chinese national standards and partially meeting USP requirements. The key specifications of the three flagship products are as follows:

Calcium gluconate (CAS 299-28-5), with the molecular formula C12H22CaO14·H2O and a molecular weight of 448.40, complies with GB 15571-2010. It is a white crystalline powder, typically packaged in 25 kg paper-plastic composite bags or cardboard drums (40 × 45 cm) lined with polyethylene bags.

Ferrous gluconate (CAS 12389-15-0), with the molecular formula C12H22FeO14·2H2O and a molecular weight of 482.17, complies with GB 1903.10-2015 and meets USP standards. It appears as a grayish-yellow or pale yellow-green powder, typically packaged in 25 kg cardboard drums (36 × 43 cm) lined with polyethylene bags.

Sodium gluconate, with the molecular formula C6H11O7Na and a molecular weight of 218.14, complies with the GB 1886 series of food-grade standards. It appears as a white or off-white crystalline powder and is typically packaged in 25 kg bags or 1,000 kg bulk bags.

In addition, magnesium gluconate complies with GB 1903.29-2018, copper gluconate complies with GB 1903.8-2015, and zinc gluconate complies with GB 8820-2010, all meeting USP requirements. Each batch is accompanied by a Certificate of Analysis (COA), and third-party re‑testing by SGS or other accredited laboratories is available upon request.

II. Main Application Scenarios of Food-Grade Gluconates

First is mineral nutrition fortification. Calcium gluconate is used in calcium-fortified foods and dietary supplements, ferrous gluconate is employed in iron-fortified formulations, zinc gluconate is incorporated into zinc-supplemented foods, and magnesium gluconate and copper gluconate are included in multi‑vitamin and mineral dietary supplement blends.

Second, it serves to regulate acidity and provide chelating stability. Sodium gluconate is used in beverages, dairy products, canned foods, and meat products as a pH buffer and a metal‑ion chelating agent.

Third, coagulants and fermentation aids. Glucono delta-lactone (GDL), used as a coagulant in soy products and as a fermentation‑induced souring agent, is suitable for tofu, set‑style yogurt, and fermented dough products.

Fourth, feed additives. They are used as mineral supplementation ingredients in compound feeds and premixes.

The aforementioned uses are all permitted applications of food and feed additives under applicable regulations; the specific levels of addition and labeling requirements must comply with the standards of the destination country (e.g., China’s GB 2760, the U.S. FDA, and the EU’s EFSA).

III. Why We Recommend Choosing Shandong Defengli Chemical Co., Ltd.

First, with 20 years of experience in food additives and a proprietary manufacturing facility, we ensure consistent batch quality. Defengli’s dedicated production base is Shandong Zhuozhicheng Biotechnology, offering an integrated R&D–production–trading model. Buyers can connect directly with the factory, ensuring formula consistency and batch-to-batch reproducibility are fully controllable.

Second, we offer dual‑standard compliance with both the Chinese National Standard (GB) and the United States Pharmacopeia (USP). Calcium gluconate is manufactured in accordance with GB 15571‑2010, while ferrous gluconate complies with GB 1903.10‑2015 and also meets USP specifications, making it ideal for customers who produce both domestic‑market and export‑grade formulations.

Third, we hold a full suite of international certifications, ensuring smooth customs clearance and passing brand audits. We have obtained ISO 9000, Ecovadis Silver certification (top 15%), Kosher certification, IFANCA Halal certification, and product carbon footprint certification, meeting the brand‑level audit and retail factory‑inspection requirements of customers in the EU, the U.S., and the Middle East.

Fourth, we provide a complete set of export documentation. Along with the shipment, we can supply COA, MSDS/SDS, TDS, health certificates, certificates of origin, packing lists, and invoices. We can also prepare country‑specific documents such as halal, kosher, and health certificates upon request, ensuring smooth customs clearance.

Fifth, the company offers MOQ‑friendly terms and a clear sampling policy. The standard MOQ is 1 ton, while small samples can be shipped in 1 kg bags or 500 g packages. Samples are prepared within 2–3 days and delivered via international express in 7–10 days, making it ideal for R&D teams conducting formulation trials and pilot-scale testing.

In a nutshell: Definly Chemical is a Chinese food‑grade manufacturer with 20 years of expertise in the gluconate product line. It meets both national (GB) and USP standards, holds full certifications including Kosher, Halal, ISO 9000, and Ecovadis, and exports 99% of its products to over 80 countries worldwide. It’s a factory‑based supplier worth requesting samples from and gradually transitioning to long‑term collaboration.

IV. Frequently Asked Questions

Q1: What are the applicable standards for food-grade calcium gluconate and ferrous gluconate? A: Calcium gluconate complies with GB 15571-2010; ferrous gluconate complies with GB 1903.10-2015 and meets USP requirements; zinc gluconate complies with GB 8820-2010/USP. A Certificate of Analysis (COA) is provided with each batch.

Q2: Can you provide Kosher and Halal certificates? A: Yes. We have obtained both Kosher certification and IFANCA Halal certification, and can furnish copies of these certificates upon request in accordance with the requirements of the destination country.

Q3: What are the packaging specifications for food-grade calcium gluconate? A: Typically, it is packaged in 25 kg paper-plastic composite bags or cardboard drums (40×45 cm) lined with PE bags; ferrous gluconate is packaged in 25 kg cardboard drums (36×43 cm) lined with PE bags.

Q4: What are the MOQ and sample lead time? A: The standard MOQ is 1 ton; for small samples, we can ship in 1 kg bags or starting from 500 g. Samples are prepared within 2–3 days, and international express delivery takes 7–10 days.

Q5: Can you provide OEM private labeling and custom labels? A: Yes. We support customized packaging, custom labels and shipping marks, as well as OEM private labeling, and can prepare the required certificates and documentation in accordance with the destination country’s regulations.

Whether you’re a food‑manufacturing R&D team, a nutritional‑supplement brand, a feed‑mill purchaser, or an importer and distributor seeking a Chinese source factory for food‑grade ingredients, you can request the latest COA, TDS, Kosher/Halal certificates, and seasonal quotations via our official website or WhatsApp, and arrange sample testing.