Copper Gluconate Encyclopedia — Scientific Background

What Is Copper Gluconate?

Copper gluconate (CAS 527-09-3), also known as cupric gluconate or copper(II) D-gluconate, is an organic copper salt of D-gluconic acid. It is chemically characterized by the molecular formula C₁₂H₂₂CuO₁₄ and a molecular weight of 453.84 g/mol. Copper gluconate occurs as light blue to bluish-green, odorless crystals, or as a fine, light blue powder. It is prepared by the reaction of gluconic acid solutions with cupric oxide or basic cupric carbonate. Copper gluconate contains approximately 13.7%–14.3% elemental copper and is freely soluble in water.

Regulatory Status and Pharmacopoeial Standards

Copper gluconate holds a well-established regulatory position as both a pharmaceutical and food ingredient:

FDA GRAS Status — Copper gluconate is affirmed as Generally Recognized As Safe (GRAS) by the FDA under 21 CFR 184.1260 for use as a nutrient supplement and synergist in food, with no limitation other than current good manufacturing practice. It may be used in infant formula in accordance with section 412(g) of the Federal Food, Drug, and Cosmetic Act. The FDA Substances Added to Food database (formerly EAFUS) lists copper gluconate with CAS Registry No. 527-09-3.

USP Monograph — Copper Gluconate contains not less than 98.0% and not more than 102.0% of C₁₂H₂₂CuO₁₄.

Food Chemicals Codex — Copper gluconate meets the specifications of the Food Chemicals Codex, 3d Ed. (1981), p. 90.

Global Standards — Copper gluconate conforms to Chinese national standard GB1903.8-2015 and FCC 8 (2012). It is also monographed in the European Pharmacopoeia and the Japanese Standards for Food Additives (JSFA).

Physiological Functions of Copper

Copper is an essential trace mineral present in all body tissues. As a cofactor for critical enzymes, it governs a diverse array of physiological processes:

• Mitochondrial Energy Production — Copper is a cofactor for cytochrome c oxidase (Complex IV), the terminal enzyme in the mitochondrial electron transport chain. Copper deficiency impairs ATP synthesis and mitochondrial function.

• Antioxidant Defense — Copper-zinc superoxide dismutase (CuZnSOD, SOD1) catalyzes the dismutation of superoxide radicals to hydrogen peroxide and oxygen, protecting cells from oxidative damage.

• Iron Metabolism — Copper is required for the oxidation of iron to the Fe³⁺ state for binding to transferrin. Ceruloplasmin, a copper-dependent enzyme, facilitates iron mobilization from storage sites. Copper deficiency leads to impaired iron utilization and anemia.

• Connective Tissue Formation — Copper is a cofactor for lysyl oxidase, which catalyzes the cross-linking of collagen and elastin. Copper deficiency results in weakened connective tissue, vascular abnormalities, and bone demineralization.

• Neurotransmitter Synthesis — Copper is a cofactor for dopamine-β-hydroxylase, which converts dopamine to norepinephrine.

• Melanin Synthesis — Copper is a cofactor for tyrosinase, the rate-limiting enzyme in melanin production.

• Immune Function — Copper is involved in the development and function of immune cells, including T lymphocytes and neutrophils.

Mechanisms of Action and Absorption

Conventional Copper Absorption Pathway

Copper absorption occurs primarily in the stomach and small intestine, mostly from the duodenum. Oral absorption is rapid, with the maximum concentration of copper in the plasma (Cmax) detected 1.5 hours after administration in animal studies. Copper absorption ranges from 12% to 71% in adult humans and from 75% to 84% in infants, depending on dietary intake and copper status.

Copper is absorbed from the gastrointestinal tract as ionic copper or bound to amino acids. The oxidized state Cu(II) is reduced to Cu(I) by reductases at the apical membrane of gastrointestinal enterocytes before uptake. Cu(I) is then transported by the high-affinity copper transporter 1 (Ctrl) into enterocytes. From epithelial cells, copper is transported by the copper chaperone antioxidant-1 to ATP7A, which exports copper into the portal venous system.

liposomal Absorption Pathway

Liposomal encapsulation provides a fundamentally different absorption mechanism. The liposomal phospholipid bilayer is similar to cell membranes in the human body, which makes them progressively biocompatible. liposomes protect copper from premature interaction with dietary inhibitors such as zinc and molybdenum, which compete for the same intestinal transport pathways. The liposomal delivery system bypasses the regulated Ctrl absorption pathway and provides an alternative route of cellular entry.

Copper Homeostasis and Regulation

Copper absorption and homeostasis are tightly regulated. Absorption efficiency decreases with increasing dietary or supplemental copper intake. In a study of young men administered various copper doses in food over 42–98 days, absorption efficiencies were 55–56%, 36%, and 12% at doses of 0.785, 1.68, and 7.53 mg Cu/day, respectively. This homeostatic regulation ensures that copper status is maintained within a narrow physiological range.

Liposomal copper gluconate

Liposomal encapsulation of copper gluconate provides a fundamentally different delivery mechanism from conventional forms. The phospholipid bilayer surrounds the copper-gluconate complex, forming a protective shell that enhances absorption and reduces gastrointestinal irritation. This delivery system:

• Protects copper from premature interaction with dietary inhibitors (zinc, molybdenum)

• Improves mineral absorption 4–6× vs standard mineral powders

• Enhances intestinal absorption through lipid-mediated pathways

• Reduces gastrointestinal side effects by minimizing direct mucosal contact

• Provides controlled release for prolonged enzymatic support

Clinical Evidence

Copper Deficiency and Repletion

Copper gluconate is the preferred supplement for copper deficiency. Supplemental doses of elemental copper effective in several copper depletion/repletion experiments ranged from 2 to 6 mg daily. Replacement with 2 mg of elemental copper 2–3 times a day orally is the preferred method of copper replacement. The authors‘ clinic combines oral replacement with a 2 mg weekly intravenous infusion for 1 month.

Oral Copper Absorption in Clinical Studies

A study of adult men fed low-copper or high-copper diets maintained copper homeostasis, with similar absorption between groups. Another study of 11 young men administered various copper doses in food over 42–98 days found absorption efficiencies of 55–56%, 36%, and 12% at doses of 0.785, 1.68, and 7.53 mg Cu/day, respectively.

Copper and Iron Metabolism

Copper is required for the oxidation of iron to the Fe³⁺ state for transport by transferrin. Copper deficiency impairs iron mobilization, leading to anemia. Copper supplementation is used in the complex medication of iron-deficiency anemia alongside iron salts.

12-Week Clinical Trial

In a 12-week, double-blind, randomized clinical trial, subjects received either a 5 mg capsule of Copper Gluconate or placebo twice a day. No significant changes in copper, zinc, and magnesium levels were observed, confirming the safety and tolerability of copper gluconate supplementation at these doses.

Safety and Regulatory

Copper gluconate is generally well tolerated at commonly used doses. The Tolerable Upper Intake Level (UL) for copper is 10 mg daily for adults. Common side effects of copper supplementation may include gastrointestinal discomfort, nausea, and metallic taste.

Copper gluconate is Generally Recognized As Safe (GRAS) by the FDA under 21 CFR 184.1260 for use as a nutrient supplement and synergist in food, with no limitation other than current good manufacturing practice. It is monographed in the USP, Food Chemicals Codex, European Pharmacopoeia, and Japanese Standards for Food Additives. Copper gluconate is widely commercialized as a dietary supplement ingredient and pharmaceutical agent. Testing protocols must adhere to international standards including USP, FCC, European Pharmacopoeia, and FAO/WHO Codex Alimentarius. Formulators should verify local regulatory requirements prior to market entry.

This product is intended for research, nutraceutical, and functional food applications. Not intended to diagnose, treat, cure, or prevent any disease.

79$/KG