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Moderate evidenceBrain & cognition

Choline

Choline is an essential nutrient most people under-consume, with genuine importance for liver health and fetal brain development. As a nootropic for healthy adults the evidence is thin, and high intakes raise TMAO, a cardiovascular risk marker.

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What the science says

  • Prevents hepatic steatosis and muscle damage in deficiency Strong evidence

    Controlled feeding studies depleting and repleting choline in adults produced fatty liver and elevated creatine kinase that resolved on repletion. Requirements vary markedly: premenopausal women are relatively protected by oestrogen-driven endogenous synthesis, while men and postmenopausal women develop signs of deficiency far more readily, and common PEMT and MTHFD1 polymorphisms shift individual requirements substantially.

  • Improves infant cognitive development when supplemented in pregnancy Moderate evidence

    A randomised double-blind controlled feeding study gave pregnant women 480 or 930 mg/day choline in the third trimester and found faster infant information processing speed at 4-13 months in the higher-dose group. The trial was small (26 completing), and larger confirmatory trials are lacking, but the mechanism and animal data make this the most interesting choline claim.

  • Enhances memory or cognition in healthy adults Limited evidence

    Despite choline being the precursor to acetylcholine, trials of choline bitartrate, citicoline and alpha-GPC in healthy young adults have produced inconsistent and mostly null cognitive results. Citicoline has somewhat better data in post-stroke and vascular cognitive impairment populations than in healthy users — which is not the population buying it.

  • Raises TMAO, a cardiovascular risk marker Moderate evidence

    Gut bacteria convert dietary choline, phosphatidylcholine and carnitine to trimethylamine, which the liver oxidises to TMAO — a metabolite prospectively associated with cardiovascular events in large cohorts. Supplemental choline reliably raises plasma TMAO. Whether TMAO is causal or merely a marker remains genuinely unsettled, so this is a caution rather than a contraindication.

Dosage & safety

Studied doseAdequate intake is 550 mg/day for men, 425 mg/day for women, 450 mg/day in pregnancy and 550 mg/day when lactating — most people fall short. Eggs (about 150 mg per yolk), liver, soybeans, beef and fish are the best sources. The pregnancy trial used 480-930 mg/day total intake. Tolerable upper limit is 3,500 mg/day for adults. Forms differ: choline bitartrate is cheap but poorly brain-penetrant; alpha-GPC (300-600 mg/day) and citicoline (250-500 mg/day) are the forms used in cognitive studies and cost more.
SafetyHigh doses (typically above 7.5 g/day, sometimes lower) cause a fishy body odour from trimethylamine, plus sweating, salivation, hypotension and gastrointestinal upset. Supplemental choline raises plasma TMAO, and one observational analysis has linked alpha-GPC use to increased stroke risk — unconfirmed, but reason not to megadose if you have existing cardiovascular disease. People with trimethylaminuria must restrict choline. Theoretical caution with cholinergic drugs and in bipolar disorder, where high-dose choline has been reported to worsen depressive symptoms. Not banned in sport. Intakes at or modestly above the AI in pregnancy are considered safe and are probably under-emphasised — many prenatal vitamins contain little or no choline.

How to take it

TimingTiming does not matter.
With food?With food, which reduces the nausea higher doses can cause.
Worth knowingTwo eggs supply roughly 300 mg for pennies, and most prenatal vitamins contain little or no choline despite the requirement rising in pregnancy — check yours.

Frequently asked questions

Do I need a choline supplement?

Most people under-consume choline: the adequate intake is 550 mg/day for men and 425 mg/day for women. Food is the easy fix, since eggs supply about 150 mg of choline per yolk.

Is choline important during pregnancy?

The evidence is moderate: a small trial found infants of mothers getting 930 mg/day of choline in the third trimester processed information faster than those at 480 mg/day. Many prenatal vitamins contain little or no choline, so check yours.

Does choline or alpha-GPC work for memory?

In healthy adults the evidence is limited — trials of choline bitartrate, citicoline and alpha-GPC are inconsistent and mostly null. Citicoline has somewhat better data in post-stroke and vascular cognitive impairment, not in healthy users.

Does choline have side effects?

High doses of choline cause a fishy body odour, sweating, low blood pressure and stomach upset. Choline supplements also raise TMAO, a cardiovascular risk marker, so avoid megadosing choline if you have heart disease.

Scientific references

Where to buy

Advance Physician Formulas, Choline Bitartrate, 260 mg, 60 Vegetable Capsules

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