Calcium borogluconate

MineralCalciumBest with a meal

What is it

Calcium borogluconate is a chelated mineral compound combining calcium with boron and gluconic acid. It is occasionally used in supplements as a delivery form of calcium and boron, and is more familiar in veterinary medicine as an injectable treatment for milk fever in cattle.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Calcium and boron supplementation

Limited Evidence

Calcium borogluconate provides both minerals in a soluble form. Calcium supplementation is well established for bone health; boron supplementation has more limited but suggestive evidence for bone density and joint health. Evidence specific to the borogluconate form is sparse.

How it works

Calcium borogluconate provides both calcium and boron in a soluble form. Gluconic acid is a mild organic acid derived from glucose oxidation that improves the solubility and palatability of mineral salts. When ingested, the compound dissociates in the gastrointestinal tract, releasing calcium and boron that are then absorbed through standard mineral transport pathways in the small intestine. Calcium absorption depends on vitamin D status, gastric acid, and the presence of competing minerals. Boron is rapidly and almost completely absorbed from the gut. In humans, supplemental calcium supports bone mineralization, neuromuscular function, and many enzymatic processes, while boron has emerging roles in bone metabolism, hormone activity, and inflammation. The borogluconate form is uncommon in human supplements compared to calcium carbonate, citrate, or amino acid chelates.

Dosage

There is no specific RDA for calcium borogluconate as a compound. The RDA for elemental calcium in adults is 1,000 to 1,200 mg/day; for boron there is no RDA, with adequate intakes estimated at 1 to 3 mg/day. Supplement doses of calcium borogluconate in human products typically deliver small amounts of each mineral; dosing is usually based on the elemental calcium or boron content. The Tolerable Upper Intake Level for calcium is 2,500 mg/day in adults and for boron is 20 mg/day.

When and how to take it

Calcium absorption is best in single doses of 500 mg or less, taken with food (carbonate forms) or any time (citrate forms). Boron has no specific timing requirements. If using calcium borogluconate for calcium content, split doses through the day rather than taking a large amount at once.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Calcium borogluconate (oral)

Used in some specialty supplements as a combined mineral delivery form.

Soluble; both calcium and boron are reasonably absorbed.

Safety

Generally well tolerated at typical dietary supplement doses. Excessive calcium intake can cause constipation, kidney stones, and hypercalcemia; excessive boron intake can cause nausea, vomiting, and reproductive concerns. Calcium borogluconate is GRAS-equivalent at food and supplement use levels. Injectable forms used in veterinary medicine carry different risk profiles not relevant to oral human supplementation.

Who should be cautious

People with kidney stones, hypercalcemia, hyperparathyroidism, or kidney disease should consult a clinician before calcium supplementation. Boron should be limited in pregnancy due to reproductive concerns at high doses. People on thyroid hormone or bisphosphonate therapy should separate doses.

Interactions

Calcium can reduce absorption of iron, zinc, tetracycline and quinolone antibiotics, levothyroxine, and bisphosphonates; separate dosing by 2 to 4 hours. Boron may interact with hormone therapies and possibly with magnesium balance.

Frequently asked questions

Is calcium borogluconate better than calcium carbonate?⌄

There is no strong evidence that calcium borogluconate is superior for calcium delivery. It does provide boron as an additional mineral, which may be a consideration if you want both.

Why is calcium borogluconate in veterinary products?⌄

It is widely used as an injectable to treat milk fever (postpartum hypocalcemia) in dairy cattle. Veterinary use does not directly translate to human oral supplementation.

How much boron does calcium borogluconate provide?⌄

The boron content depends on the specific product formulation. Check the Supplement Facts label, which should specify elemental amounts of both minerals.

References

Calcium borogluconate on Wikidata — Wikidata link

Calcium borogluconate on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Calcium borogluconate (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.