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Limited evidenceBrain & cognition

Uridine Monophosphate

A nucleotide sold as a synapse-building nootropic. Human work shows it raises brain phospholipid precursors, but no controlled trial has shown that uridine alone improves memory in healthy people.

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What the science says

  • Raises brain membrane precursors Limited evidence

    A phosphorus magnetic resonance spectroscopy study in healthy adults found that short-term uridine administration increased brain phospholipid precursor levels. This is a biochemical marker, not a cognitive outcome.

  • Memory in mild Alzheimer's disease, in combination Moderate evidence

    A randomized controlled trial of a medical food combining uridine monophosphate with DHA, EPA, choline, B vitamins and antioxidants reported improved delayed verbal recall in drug-naive patients with mild Alzheimer's disease. The effect belongs to the full combination; uridine's individual contribution was not isolated, and later trials in prodromal disease were less clear.

  • Mood in bipolar disorder Limited evidence

    A 6-week open-label study in seven depressed adolescents with bipolar disorder reported reduced depression scores with uridine. With no control group and seven participants, this is preliminary at best.

Dosage & safety

Studied doseSupplement labels typically give 150–500 mg/day of uridine monophosphate. Human studies used higher amounts (roughly 500–2,000 mg/day), and the Alzheimer's medical food supplied 625 mg/day within a fixed combination.
SafetyShort-term studies report few side effects beyond mild gastrointestinal upset and headache. Long-term safety in healthy adults is unstudied. Uridine can interfere with fluorouracil-based chemotherapy and should be avoided by anyone on those drugs. Not established in pregnancy or childhood.

How to take it

TimingTiming does not matter; no schedule has been compared in humans.
With food?With food, which limits the mild gastrointestinal upset that is the commonest complaint.
Worth knowingSublingual dosing is widely claimed to be superior and has never been demonstrated - and the Alzheimer's evidence is for a fixed combination with DHA, EPA and choline, not uridine alone.

Interactions

With medications

  • fluorouracil, capecitabine and other fluoropyrimidine chemotherapy

    Uridine competes with these drugs at their target enzyme - it is used clinically as a rescue agent for overdose, which means it can also blunt intended anticancer activity. do not take it during fluoropyrimidine chemotherapy

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

Frequently asked questions

Does uridine monophosphate improve memory?

Not on its own, as far as trials show. Uridine monophosphate raises brain phospholipid precursors in healthy adults, but no controlled trial has shown uridine alone improves memory, so the evidence is limited.

Does uridine help Alzheimer's disease?

A medical food combining uridine monophosphate with DHA, EPA, choline, B vitamins and antioxidants improved delayed verbal recall in mild Alzheimer's disease, with moderate evidence. That effect belongs to the combination, and later trials in earlier disease were less clear.

How much uridine monophosphate should I take?

Supplement labels typically give 150-500 mg/day of uridine monophosphate, while human studies used roughly 500-2,000 mg/day; the Alzheimer's medical food supplied 625 mg/day within a fixed combination. No dose is proven for memory.

Is uridine monophosphate safe?

Short-term studies of uridine monophosphate report few side effects beyond mild stomach upset and headache, but long-term safety is unstudied. Do not take it during fluorouracil, capecitabine or other fluoropyrimidine chemotherapy, as it can blunt the drug's effect.

Scientific references

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