Magnesium Beta-Hydroxybutyrate

SpecialtyKetone body saltBest with a meal

What is it

Magnesium beta-hydroxybutyrate (Mg-BHB) is a magnesium salt of the ketone body BHB used as an exogenous ketone supplement that also contributes elemental magnesium.

Evidence for 2 uses

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

Acute blood ketone elevation

Strong Evidence

BHB salts reliably raise blood ketone levels for a few hours.

Performance and fat loss

Mixed Evidence

Evidence does not consistently show performance or weight benefits at typical supplement doses.

How it works

Mg-BHB dissociates into magnesium ions and BHB. Supplemental BHB raises blood ketones transiently and can be used by brain and muscle as alternative fuel. Magnitude of ketone elevation is generally modest (~0.5-1.5 mmol/L) and short-lived. Magnesium contributes to normal nerve and muscle function.

Dosage

Servings typically deliver 3-6 g of Mg-BHB providing about 1-2 g of BHB plus several hundred milligrams of magnesium. Check label for actual elemental amounts.

When and how to take it

Often taken before exercise or during ketogenic protocols. Magnesium tolerability may favor splitting doses with meals.

1 commercial form

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

Magnesium BHB powder

Common exogenous ketone form.

Provides BHB and magnesium together.

Safety

Generally well tolerated. Magnesium load is meaningful: large doses can cause diarrhea or cumulative magnesium effects, especially with kidney impairment.

Who should be cautious

Caution in kidney disease (impaired magnesium clearance) and with medications that increase magnesium levels. Pregnancy and breastfeeding: limited data on Mg-BHB specifically.

Interactions

Magnesium may bind certain antibiotics (tetracyclines, quinolones) and bisphosphonates, reducing their absorption when taken together. Space other medications by 2 hours.

Food sources

Not naturally present in food

Amount
n/a
%DV
—

Frequently asked questions

Does Mg-BHB count toward my magnesium intake?⌄

Yes. It can contribute meaningful elemental magnesium per dose. Check the label so you do not double up with another magnesium supplement.

Is Mg-BHB better than calcium BHB?⌄

They both deliver BHB. Choice depends on whether you want to add calcium, magnesium, or sodium, and on personal tolerance. None reliably produce big ketone elevations.

References

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

Research on Magnesium Beta-Hydroxybutyrate (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.