Magnesium Octanoate

MineralMagnesium saltBest with a meal

What is it

Magnesium octanoate is a salt of magnesium with octanoic (caprylic) acid, an 8-carbon medium-chain fatty acid. It is used in some supplements and as a food additive/lubricant in tablet manufacturing.

Evidence for 1 use

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

Magnesium nutrition

Strong Evidence

Adequate magnesium intake is essential. Specific clinical benefit of the octanoate form over other magnesium salts is not established.

How it works

In the body, magnesium octanoate dissociates into magnesium ions and octanoate. Magnesium supports hundreds of enzymatic reactions, including energy metabolism, muscle and nerve function, and bone formation. Octanoate (caprylic acid) is a medium-chain fatty acid metabolized rapidly via the portal vein and converted to ketones in the liver. The fatty acid portion provides modest calories. In tablet manufacturing, magnesium octanoate may serve as a lubricant (a less common alternative to magnesium stearate).

Dosage

RDA for magnesium is 310-420 mg/day. UL from supplements is 350 mg/day elemental Mg. Specific supplemental doses of magnesium octanoate are not standardized.

When and how to take it

Take with food to minimize GI side effects.

1 commercial form

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

Magnesium octanoate (less common)

Less common than citrate, glycinate, or oxide.

Comparable in absorption to other organic magnesium salts.

Safety

Magnesium supplements can cause loose stools. Octanoic acid in modest amounts is GRAS. Long-term safety of magnesium octanoate as a supplement form is not specifically studied.

Who should be cautious

Severe kidney disease: avoid extra magnesium without supervision.

Interactions

Magnesium interactions: reduced absorption of bisphosphonates, quinolones, tetracyclines, levothyroxine (separate by 2 hours).

Food sources

Not a typical food source

Amount
N/A
%DV
—

Frequently asked questions

Why magnesium octanoate specifically?⌄

It is a less common form. Manufacturers may choose it for tablet processing or stability reasons. Clinical advantages over established forms like citrate or glycinate are not established.

References

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

Research on Magnesium Octanoate (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.