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Limited evidenceLongevity & antioxidants

Pyridoxamine

A natural form of vitamin B6 that blocks advanced glycation end-product formation in the laboratory. It was developed as a kidney drug, and the clinical trials did not meet their goals.

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What the science says

  • Diabetic kidney disease Limited evidence

    A randomised placebo-controlled trial of pyridoxamine dihydrochloride in 317 patients with type 2 diabetic nephropathy failed its primary endpoint of change in serum creatinine, with a signal only in a post-hoc subgroup with lower baseline creatinine. A follow-up phase 3 study was terminated as a pilot without demonstrating benefit.

  • Vitamin B derivatives for kidney disease generally Limited evidence

    A Cochrane review of vitamin B and its derivatives for diabetic kidney disease found insufficient evidence of benefit on clinically important outcomes, with concerns about harm in some B-vitamin trials.

  • Anti-glycation effects Limited evidence

    Pyridoxamine's ability to trap reactive carbonyls and inhibit advanced glycation end-product formation is well demonstrated in vitro and in animal models. No human study has shown that this translates into slower ageing or better long-term health outcomes.

Dosage & safety

Studied doseThe kidney trials used 150-300 mg twice daily. There is no established supplement dose, and note that ordinary vitamin B6 needs are met by 1.3-2 mg/day of any B6 form.
SafetyNot sold as a dietary supplement in the United States: the FDA ruled pyridoxamine to be an investigational drug excluded from the supplement definition, so US products are unavailable or non-compliant. High-dose vitamin B6 in any form can cause sensory peripheral neuropathy, which is the main risk at the doses used in trials. Avoid combining with other high-dose B6 products, and do not use in pregnancy or with existing neuropathy without medical supervision.

How to take it

TimingTwice daily if used at trial doses.
With food?With food, which reduces nausea.
Worth knowingNumbness or tingling in the hands or feet means stop and see a doctor — B6 neuropathy is the real risk here, and US products are non-compliant anyway.

Interactions

With medications

  • levodopa (without carbidopa)

    High-dose B6 accelerates peripheral breakdown of levodopa and reduces how much reaches the brain. do not take high-dose B6 without your neurologist's approval

  • phenytoin and phenobarbital

    High-dose B6 can lower serum levels of these anticonvulsants. do not combine without level monitoring

  • isoniazid, hydralazine and penicillamine

    These drugs deplete B6, so replacement is sometimes intended — but at nutritional doses, not hundreds of milligrams. use the dose your prescriber specifies

With other supplements

  • B-complex, energy drinks and other B6 sources

    Total B6 stacks up and the risk is sensory peripheral neuropathy. add up the B6 across every product you take

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does pyridoxamine help diabetic kidney disease?

No: a placebo-controlled trial of pyridoxamine in 317 patients with type 2 diabetic nephropathy failed its primary endpoint, with only a post-hoc subgroup signal, and a follow-up phase 3 study was terminated without showing benefit. The evidence for pyridoxamine is limited.

Does pyridoxamine slow aging by blocking AGEs?

Pyridoxamine inhibits advanced glycation end-product formation in vitro and in animals, but no human study has shown this translates into slower ageing or better long-term health outcomes. The anti-ageing evidence is limited.

Can I buy pyridoxamine as a supplement in the US?

No, the FDA ruled pyridoxamine an investigational drug excluded from the supplement definition, so US pyridoxamine products are unavailable or non-compliant. Ordinary vitamin B6 needs are met by 1.3–2 mg/day of any B6 form.

What are the side effects of pyridoxamine?

The main risk of pyridoxamine at trial doses of 150–300 mg twice daily is sensory peripheral neuropathy, as with any high-dose vitamin B6. Numbness or tingling in the hands or feet means stop and see a doctor, and add up B6 across every product you take.

Scientific references

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