Calcium fructate

MineralCalciumBest with a meal

What is it

Calcium fructate is a calcium salt of fructaric acid (related to fructose). It is uncommon in mainstream supplements and may also appear as a component of proprietary blends with hormone or testosterone-support labeling.

How it works

Like other calcium salts, calcium fructate dissociates in the digestive tract to release calcium ions, which are absorbed in the small intestine. The bioavailability of calcium from this salt has not been compared head-to-head with more common forms in published human studies. When included in proprietary 'testosterone support' blends, the rationale for calcium fructate's role is not clearly supported by independent clinical research.

Dosage

There is no established intake recommendation for calcium fructate specifically. The RDA for total calcium is 1,000 to 1,200 mg per day in adults.

When and how to take it

Calcium absorption is best in doses of 500 mg or less at a time, taken with food. Avoid taking with iron or thyroid medication.

1 commercial form

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Calcium fructate

Uncommon calcium salt. Calcium citrate or carbonate have better-defined absorption data.

Bioavailability not well characterized.

Safety

Calcium salts can cause constipation, gas, and rare hypercalcemia at high doses. People with kidney impairment can accumulate calcium and should not supplement without supervision.

Who should be cautious

Avoid high calcium supplementation in kidney stones (calcium oxalate type), hypercalcemia, and severe kidney disease without supervision.

Interactions

Calcium reduces absorption of tetracyclines, fluoroquinolones, bisphosphonates, levothyroxine, and iron supplements. Separate timing by 2 to 4 hours.

Food sources

Yogurt (plain, low-fat)

Amount
1 cup
%DV
37%

Milk

Amount
1 cup
%DV
23%

Fortified plant milk

Amount
1 cup
%DV
23%

Frequently asked questions

Is calcium fructate a good calcium source?⌄

It provides calcium but is not well studied. Calcium citrate, carbonate, or food sources have more reliable data.

Does it boost testosterone?⌄

There is no rigorous human evidence supporting a testosterone-boosting effect from calcium fructate.

References

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

Research on Calcium fructate (PubMed search) — PubMed link

Track Calcium fructate with Pilora

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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.