calcium Octanoate

MineralCalcium saltBest with a meal

What is it

Calcium octanoate is a salt of calcium with octanoic (caprylic) acid, an 8-carbon medium-chain fatty acid. It is used in some supplements and as a tablet processing aid (lubricant), similar in role to calcium stearate but using a shorter fatty acid.

Evidence for 1 use

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

Calcium nutrition

Strong Evidence

Adequate calcium is essential for bone health. Specific clinical advantage of the octanoate salt is not established.

How it works

In the body, calcium octanoate dissociates into calcium ions and octanoate. Calcium supports bone mineralization, muscle and nerve function, and many enzymatic processes. Octanoate is a medium-chain fatty acid metabolized rapidly via the portal vein and converted to ketones in the liver. As a tablet excipient, calcium octanoate acts as a lubricant during tablet compression.

Dosage

RDA for calcium is 1000 mg/day for most adults. UL is 2500 mg/day. The amount in supplements as a processing aid is small and not nutritionally relevant.

When and how to take it

When used as a calcium source, take with food. Split doses above 500 mg elemental calcium.

1 commercial form

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

Calcium octanoate

Less common form; used in some supplement formulations.

Soluble salt; absorption similar to other organic calcium salts.

Safety

Generally safe at amounts used in supplements. Calcium supplements may cause constipation, gas, and bloating. Excessive calcium intake is linked to kidney stones.

Who should be cautious

People with hypercalcemia, kidney stones, or kidney disease should consult a clinician before supplementing.

Interactions

Calcium reduces absorption of iron, zinc, tetracyclines, quinolones, levothyroxine, and bisphosphonates if taken simultaneously; separate by 2-4 hours.

Food sources

Not a typical food source

Amount
N/A
%DV
—

Frequently asked questions

Why calcium octanoate instead of calcium stearate?⌄

Calcium octanoate is a less common alternative tablet lubricant. Some manufacturers prefer shorter-chain fatty acid salts for processing or marketing reasons (avoiding 'stearate' label).

References

calcium Octanoate on Wikidata — Wikidata link

calcium Octanoate (PubChem CID 16610) — PubChem link

calcium Octanoate on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on calcium Octanoate (PubMed search) — PubMed link

Track calcium Octanoate 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.