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Limited evidenceBrain & cognition

Colloidal Gold

Suspended gold nanoparticles marketed for focus, mood and joint comfort. There are no clinical trials in humans supporting any of these uses, and the analytical work that exists is about characterising exposure, not benefit.

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What the science says

  • No human trials for cognition or focus Limited evidence

    A 2026 physicochemical evaluation of commercial colloidal gold supplements characterised particle size and estimated oral exposure, and reported only preliminary biological assessment. No randomized trial has tested colloidal gold for attention, memory or mood.

  • Joint claims borrow from prescription gold drugs Limited evidence

    Gold compounds such as auranofin were genuinely studied in rheumatoid arthritis, with a Cochrane review finding modest disease activity benefit and substantial toxicity. These are pharmaceutical gold salts at drug doses, not the trace amounts of metallic gold in a supplement, and the evidence does not transfer.

Dosage & safety

Studied doseNo established dose. Products typically supply a few micrograms of gold per serving, an exposure with no demonstrated physiological effect.
SafetyLong-term ingestion of gold is poorly characterised in humans. Injectable and oral gold drugs cause rash, mouth ulcers, proteinuria and bone marrow suppression, which is reason for caution rather than reassurance. Supplement quality is variable, and there is no reason to use it in pregnancy, in children, or in place of proven treatment.

How to take it

TimingTiming does not matter, because there is nothing to time — no physiological effect has been demonstrated.
With food?Food makes no difference.
Worth knowingThe gold drugs used in medicine cause rash, mouth ulcers, kidney damage and marrow suppression, so long-term ingestion is a reason for caution rather than the reassurance the marketing implies.

Frequently asked questions

Does colloidal gold improve focus or mood?

No randomized trial has tested colloidal gold for attention, memory or mood, and the analytical work that exists only characterises particle size and exposure. Colloidal gold's evidence grade is limited: there is no human evidence of benefit.

Does colloidal gold help joint pain or arthritis?

The joint claims for colloidal gold borrow from pharmaceutical gold salts such as auranofin, which showed modest benefit in rheumatoid arthritis with substantial toxicity at drug doses. That evidence does not transfer to the trace amounts of metallic gold in a supplement.

Is colloidal gold safe to take?

Long-term ingestion of colloidal gold is poorly characterised in humans, and gold drugs cause rash, mouth ulcers, kidney damage and bone marrow suppression, which is reason for caution. There is no reason to use colloidal gold in pregnancy, in children, or in place of proven treatment.

How much colloidal gold should I take?

Colloidal gold has no established dose; products typically supply a few micrograms of gold per serving, an exposure with no demonstrated physiological effect. Timing and food make no difference because no effect has been shown.

Scientific references

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