This page describes pharmacological agents that may have legal restrictions, side effects, and drug interactions in your jurisdiction. Information is for educational research only — consult a clinician before considering any compound.
Uridine Monophosphate (UMP)
Pyrimidine nucleoside | CDP-choline pathway substrate — feeds the Kennedy pathway as the rate-limiting cytidine donor for synaptic membrane phosphatide synthesis. Wurtman MIT lab paradigm: uridine + omega-3 (DHA) + choline = synaptogenesis substrate triad.
Aliases (7)
Overview
What is Uridine Monophosphate (UMP)?
Uridine monophosphate (UMP) is a pyrimidine ribonucleotide — uracil base + ribose + 5'-phosphate. It is endogenous (the body synthesizes it de novo and salvages it) and present in dietary RNA-rich foods (organ meats, beer, breast milk). As an OTC supplement it's sold as the disodium salt (oral capsule, 150-500 mg) or as triacetyluridine (TAU, sublingual, 25-50 mg) — a lipophilic prodrug with higher CNS bioavailability. Not FDA-approved as a drug; widely available as a dietary supplement.
Key Benefits
Substrate for the CDP-choline / Kennedy pathway — the route brain neurons use to build phosphatidylcholine and other membrane phospholipids. Pairs with DHA + choline (the Wurtman MIT triad) to support synaptogenesis and synaptic protein expression (PSD-95, synapsin-1). Used in the Souvenaid/Fortasyn Connect formulation for prodromal Alzheimer's. Community use cases: mood support, cognitive baseline, racetam stack adjunct, BDNF-pathway support.
Mechanism of Action
Oral UMP is dephosphorylated in the gut to uridine (which crosses the blood-brain barrier via SLC28/SLC29 nucleoside transporters); brain uridine kinase converts it back to UMP, then UDP, then CTP. CTP combines with phosphocholine to form CDP-choline — the rate-limiting intermediate in the Kennedy pathway for phosphatidylcholine synthesis. With DHA providing the fatty-acid tail and choline the head-group, uridine supplies the cytidine donor that lets neurons assemble new synaptic membrane. Half-life of plasma uridine after oral UMP is ~2 hours; once-daily dosing maintains adequate substrate for chronic synaptogenic support.
Pharmacokinetics
Peptide Interactions
✅ The canonical Wurtman pairing. DHA is the fatty-acid tail; uridine is the cytidine donor. Inseparable for the synaptogenesis use case. DHA 1-2 g/day + UMP …
✅ Citicoline already supplies cytidine + choline + phosphate (it IS reassembled CDP-choline). Adding UMP further raises plasma uridine. Modest redundancy, no…
✅ Alpha-GPC supplies the choline arm; UMP supplies the cytidine arm; together with DHA → full Kennedy substrate triad. Stack-friendly when alpha-GPC is the c…
✅ Racetams modulate AMPA + cholinergic transmission and reportedly consume choline faster (the "racetam headache"). UMP + choline + DHA provides membrane-pho…
✅ Threonate's NMDA / synaptic-plasticity profile is mechanistically complementary. No conflict.
✅ Both feed membrane-phospholipid pool from different angles (intact phosphatide vs precursor). Common combo in cognitive-decline protocols.
✅ Catecholamine substrate vs membrane-phosphatide substrate — orthogonal. Stack-safe.
❌ Uridine antagonizes 5-FU. Vistogard (uridine triacetate) is FDA-approved as an emergency 5-FU overdose antidote specifically because uridine outcompetes 5-…
Quality Indicators
Disodium UMP form clearly labeled
Most reputable products (Nootropics Depot, Jarrow, Liftmode) specify 'uridine-5'-monophosphate disodium' on the label. The disodium salt is the standard pharmacology-grade form; ambiguous 'uridine' labels may be the free nucleoside (less stable, lower bioavailability).
Third-party COA available
Reputable nootropics vendors publish Certificates of Analysis confirming identity (HPLC), purity (>98%), and contaminant testing (heavy metals, microbial). Demand this for any nucleotide supplement.
Sublingual TAU clearly distinguished from oral UMP
Triacetyluridine (TAU) is a lipophilic prodrug used sublingually at much lower doses (25-50 mg) than oral UMP (150-500 mg). A label conflating the two is a quality-control flag.
Powder hygroscopicity
UMP disodium is hygroscopic — bulk powder clumps in humid conditions. Store in airtight container with desiccant; weigh by mass not volume. Capsule form sidesteps this.
Proprietary 'uridine complex' blends
Avoid products that hide UMP dose inside a proprietary blend with vague 'phosphatide complex' marketing. The Wurtman triad only works at adequate UMP dose; underdosed blends are common.
No origin or batch information
Anonymous bulk-powder vendors without batch numbers, COAs, or sourcing documentation carry adulteration risk. UMP itself is cheap to manufacture — the cost is in QC, not raw material.
What to Expect
- Onsetover days to weeks, not minutes. Most users feel nothing acutely.
- Onset30-60 min sublingual; duration 4-6 hr.
Side Effects & Safety 5
Side Effects
- 1Mostly nothing. Uridine is exceptionally well-tolerated at supplement doses.
- 2Mild GI discomfort (occasional nausea, loose stool) on empty stomach — take with food.
- 3Mild headache (uncommon; usually first week, fades)
- 4Vivid dreams (chronic dosing, especially when stacked with choline)
- 5Mild "flat" mood in a small subset of chronic users (possibly the same cholinergic-overshoot pattern that affects high-dose alpha-GPC users)
When to Stop
- Mood destabilization (hypomania, irritability) in bipolar-spectrum users — flagged in the Kondo 2011 trial population but no clean signal at supplement doses.
- 5-FU / capecitabine antagonism: uridine outcompetes 5-FU at thymidylate synthase. Therapeutically used as Vistogard (FDA-approved 5-FU overdose antidote). Active 5-FU/capecitabine chemo patients should pause uridine supplementation — coordinate with oncology.
- Theoretical purine/pyrimidine handling concerns in gout / hyperuricemia patients on allopurinol. No clinical signal but worth flagging.
- First 1-2 weeks: GI tolerance, headache. If headache severe → reduce dose or pause.
- Week 4-8: mood/affect monitoring (rare cholinergic-overshoot pattern when stacked with choline).
- Long-term (>6 months): no documented safety concerns; uridine is endogenous and salvaged by normal metabolism.
References
Wurtman RJ, Cansev M, Sakamoto T, Ulus IH 2009, Annu Rev Nutr — Use of phosphatide precursors to promote synaptogenesis
PMID 19400698. Foundational MIT-lab review establishing the uridine + DHA + choline triad.
View StudySakamoto T, Cansev M, Wurtman RJ 2009, Brain Res — Oral supplementation with DHA and UMP increases dendritic spine density in adult gerbil hippocampus
PMID 19262950.
View StudyCarlezon WA Jr et al. 2005, Biol Psychiatry — Antidepressant-like effects of uridine and omega-3 fatty acids are potentiated by combined treatment in rats
PMID 15705349. Keystone rat forced-swim study.
View StudySoininen H et al. 2017, Lancet Neurol — 24-month intervention with a specific multinutrient in people with prodromal Alzheimer's disease (LipiDiDiet)
PMID 29097166. n=311; CDR-SoB benefit, primary cognitive composite negative.
View StudySoininen H et al. 2021, Alzheimer's Dement — 36-month LipiDiDiet multinutrient clinical trial in prodromal Alzheimer's disease
PMID 32920957. Extended follow-up.
View StudyCombined Evidence post-hoc analysis 2023
PMID 37357286. Long-term clinical slowing post-hoc.
View StudyCansev M, Wurtman RJ 2007, Neuroscience — Chronic DHA or EPA, but not arachidonic acid, alone or with uridine, increases brain phosphatide and synaptic protein levels in gerbils
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View StudyKondo DG et al. 2011, J Child Adolesc Psychopharmacol — Open-label uridine for treatment of depressed adolescents with bipolar disorder
PMID 21476939.
View StudyExamine.com — Uridine entry
community-facing dose / evidence / safety synthesis.
View StudyWurtman RJ 2014, Nutrients — A nutrient combination that can affect synapse formation
accessible synthesis of the triad framework.
View StudyPMC — Nutritional modifiers of aging brain function (Wurtman 2010)
open-access overview of substrate-limited synaptogenesis.
View StudyHow was your experience with this compound?
Anonymous · one vote per session · results below at 5+ votes.
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