Choline

vitamin

Take with food

What is it

Choline is an essential nutrient that the body needs for cell membrane structure, nerve signaling, lipid transport, and the production of the neurotransmitter acetylcholine. While the body can synthesize small amounts, most people need to obtain choline through diet. Choline was formally recognized as essential by the US Institute of Medicine in 1998.

How it works

Choline serves several distinct functions in the body. As a component of phosphatidylcholine and sphingomyelin, it is critical for cell membrane structure throughout all tissues. As a precursor to acetylcholine, it supports neurotransmission affecting memory, muscle control, mood, and many automatic body functions. As a methyl group donor (via its conversion to betaine), it participates in one-carbon metabolism alongside folate and vitamin B12. In the liver, choline is essential for VLDL assembly and lipid export. Inadequate choline intake leads to fat accumulation in the liver (non-alcoholic fatty liver) and can cause muscle damage. During pregnancy, choline supports fetal brain development and may influence the offspring's neurodevelopmental trajectory. The first months of life are a particularly important window for choline. Choline status varies considerably between individuals based on genetics, sex, hormonal status, and diet. Premenopausal women generally have higher endogenous choline synthesis due to estrogen-mediated effects, while postmenopausal women and men rely more heavily on dietary intake. Various genetic polymorphisms affect choline requirements.

Evidence for 5 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Liver health (NAFLD prevention)

Grade B

Good evidence

Adequate choline intake is required to prevent fat accumulation in the liver. Choline deficiency reliably causes non-alcoholic fatty liver disease, and supplementation can reverse this when deficiency is the cause.

Pregnancy and fetal brain development

Grade B

Good evidence

Maternal choline intake during pregnancy supports fetal brain development. Observational and some intervention research suggests higher maternal choline intake is associated with better cognitive outcomes in offspring.

Cognitive function in older adults

Grade C

Moderate evidence

Some research links adequate choline status to better cognitive performance and lower dementia risk in older adults. Intervention studies are mixed.

Muscle function

Grade C

Moderate evidence

As the precursor to acetylcholine, adequate choline supports neuromuscular function. Deficiency can cause muscle damage; supplementation reverses this in deficiency.

Athletic performance (high-dose)

Grade D

Mixed evidence

Choline has been studied for endurance performance with mixed results. Effects are not strong enough to support routine use for performance.

5 commercial forms

Choline bitartrate

Common, inexpensive form; well absorbed but doesn't cross BBB as well.

Used in basic multivitamins and standalone supplements. Provides choline for liver and general functions.

Choline citrate

Similar to bitartrate; basic choline source.

Less common; similar effects.

Alpha-GPC (alpha-glycerylphosphorylcholine)

Higher bioavailability for brain effects; crosses the blood-brain barrier.

Often used for cognitive and athletic performance. More expensive than basic choline.

Citicoline (CDP-choline)

Also provides cytidine; crosses the blood-brain barrier.

Used in cognitive support; some clinical evidence for memory and attention.

Phosphatidylcholine

Whole-membrane form found in lecithin; provides choline and fatty acids.

Used for liver support and as a phospholipid source.

Dosage

The Adequate Intake (AI) for choline is 550 mg/day for men and 425 mg/day for women, with higher needs in pregnancy (450 mg/day) and breastfeeding (550 mg/day). The Tolerable Upper Intake Level is 3,500 mg/day for adults. Most Americans consume less than the AI, and supplements typically provide 50 to 500 mg per dose. Eggs (~150 mg per yolk) and liver (~250 to 425 mg per 3 oz) are particularly rich sources.

When and how to take it

WHEN: Choline can be taken at any time of day. Take with meals to reduce GI upset and minimize fishy odor potential. Split larger doses across the day. HOW: Take with food and water. Egg consumption (especially yolks) is the most practical food-based way to meet choline needs. For supplements, citicoline or alpha-GPC forms may be preferred for cognitive support, while choline bitartrate is more affordable for general intake.

Food sources

Food	Amount	%DV
Beef liver	3 oz	76%
Egg (with yolk)	1 large	27%
Soybeans (roasted)	1/2 cup	19%
Chicken breast	3 oz	13%
Beef	3 oz	13%
Salmon	3 oz	12%
Cod	3 oz	13%
Wheat germ (toasted)	1 oz	9%

Safety

Choline at typical dietary or moderate supplement doses is well tolerated. High doses (often 7.5 g or more daily) can cause a fishy body odor due to trimethylamine production, low blood pressure, sweating, nausea, vomiting, and diarrhea. The Tolerable Upper Intake Level is 3,500 mg per day for adults. Excessive choline intake has been linked in some observational studies to higher TMAO levels and possibly increased cardiovascular risk, though causation is unclear.

Who should be cautious

Pregnant women have increased choline needs and should ensure adequate intake from food or prenatal supplements. People with trimethylaminuria (a genetic condition affecting choline metabolism) should avoid high-dose supplementation. Those with hypotension or sweating disorders should use caution with high doses. Postmenopausal women may have higher dietary requirements than premenopausal women.

Interactions

Choline has few significant drug interactions. It may interact with anticholinergic medications by competing for receptor activity. Methotrexate and other medications affecting one-carbon metabolism may interact with choline's methyl-donor functions. High doses of niacin or other lipid-modifying medications may affect choline metabolism in the liver.

Frequently asked questions

Do I need a choline supplement?⌄

Most Americans consume less than the Adequate Intake. Eggs are one of the easiest ways to meet needs (one large egg provides about 25 to 30% of daily AI). If you regularly eat eggs, liver, and animal foods, supplementation may not be needed. Vegans and pregnant women should pay particular attention to choline intake.

Which form is best?⌄

For general liver and metabolic health, choline bitartrate is affordable and effective. For cognitive support or athletic performance, alpha-GPC or citicoline cross the blood-brain barrier more effectively but cost more.

Will choline cause a fishy body odor?⌄

High doses (multiple grams) can cause a fishy odor due to trimethylamine production. This is uncommon at typical supplement doses (under 1 g/day). People with the genetic condition trimethylaminuria are particularly susceptible.

Is choline safe in pregnancy?⌄

Yes. Pregnant women have increased choline needs, and many prenatal vitamins under-deliver choline. Adequate intake supports fetal brain development. Talk to your obstetrician about your total choline intake.

Can too much choline be harmful?⌄

The Tolerable Upper Intake Level is 3,500 mg/day. Very high doses can cause low blood pressure, sweating, GI upset, and fishy odor. Some observational research links high choline intake with elevated TMAO and possible cardiovascular concerns, though causation is unclear.

References

NIH Office of Dietary Supplements - Choline — ODS link
Wikidata: Choline — Wikidata link
PubChem: Choline (CID 305) — PubChem link

Track Choline with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.