Choline Supplement Forms: Bitartrate, Chloride, Phosphatidylcholine, Citicoline and Alpha-GPC
How choline bitartrate, choline chloride, phosphatidylcholine (lecithin), citicoline and alpha-GPC differ, what trials compared, TMAO findings, and what is not known.
Content last updated . This page has not been medically reviewed.
What is Choline (supplement forms: bitartrate, phosphatidylcholine and others) good for?
What the body uses it for, and how strong the evidence is. A normal job in the body is not proof that extra supplements add benefit; each card says which.
Fat transport out of the liver
Deficiency linkCholine is used to make phosphatidylcholine, which helps carry fat out of the liver.
Supplements: Supplements correct a shortfall; no good evidence of extra benefit when intake is adequate. Not shown to treat common fatty liver disease.
Cell membrane building block
Established rolePhosphatidylcholine is a main part of cell membranes, and it is the main form of choline in foods.
Supplements: Supplements correct a shortfall; no good evidence of extra benefit when intake is adequate.
Raw material for acetylcholine
Established roleThe body uses choline to make acetylcholine, a messenger between nerve cells.
Supplements: No good evidence that extra choline raises memory or focus in healthy adults; trials in adults are inconsistent.
Muscle protection
Deficiency linkMuscle damage markers rose in a controlled study where choline was withheld.
Supplements: This is a deficiency finding; no evidence that supplements help muscles in people who get enough.
Pregnancy and fetal development needs
Established roleOfficial intake levels are higher in pregnancy and breastfeeding. Observational work links low maternal choline to neural tube defects.
Supplements: A 2025 systematic review found evidence insufficient to support or refute benefit for child brain development; trials disagree.
Betaine and homocysteine handling
Established roleThrough betaine, choline takes part in the body's handling of homocysteine, an amino acid.
Supplements: No trial evidence on supplements and homocysteine was read.
Memory and thinking in adults
Preliminary or mixedDiet studies link higher choline intake with better cognition and lower dementia risk, but they are observational.
Supplements: Supplement trials in adults are inconsistent; a 2023 review noted weak foundations for marketing claims.
Phosphatidylcholine supplements in pregnancy
Preliminary or mixedA phosphatidylcholine capsule did not change infant memory, language or development at 10 and 12 months in women eating about 360 mg of choline a day.
Supplements: Mixed and not combinable across trials.
Connected topics
Open a group to see how each topic connects and how strong the evidence is.
Health goals (2)
- Liver SupportDeficiency link
Choline is needed to move fat out of the liver, and fatty liver and liver damage appeared when it was withheld in controlled studies. That does not show supplements help common fatty liver disease.
- Women’s WellnessEstablished role
Official choline intake levels are higher in pregnancy and breastfeeding. Whether extra choline improves a child's brain development is not settled.
Body systems (4)
- Hepatic / Liver SystemDeficiency link
Without enough choline, fat builds up in the liver and liver damage can follow. This was shown in controlled low-choline studies and in people fed by vein without choline.
- Nervous SystemEstablished role
Choline is used to make acetylcholine, a messenger between nerve cells, and cell-membrane phospholipids.
- Bones, Joints & MusclesDeficiency link
Muscle damage markers rose in controlled studies where choline was withheld. This is a deficiency finding, not a use for supplements.
- Musculoskeletal SystemDeficiency link
Muscle damage markers rose in controlled studies where choline was withheld. This is a deficiency finding, not a use for supplements.
Body parts (4)
- LiverDeficiency link
Phosphatidylcholine made from choline carries fat out of the liver; low choline led to liver fat and raised liver enzymes in studies.
- CellsEstablished role
Phosphatidylcholine is a building block of cell membranes.
- Nervous SystemEstablished role
Choline is a raw material for acetylcholine, a nerve messenger.
- MusclesDeficiency link
Muscle damage was reported after three weeks of choline restriction in a controlled study.
Functional actions (1)
- Liver SupportDeficiency link
Choline is needed to export fat from the liver; this is a nutrient role, not evidence that supplements treat liver disease.
Root causes (1)
- Nutrient DeficiencyDeficiency link
Low choline causes fatty liver and liver and muscle damage in controlled studies. True deficiency is rare on ordinary diets, and intake below an Adequate Intake does not by itself prove it.
Habits (1)
- Balanced NutritionEstablished role
Choline comes mainly from food, with the most in liver, eggs, beef, fish and chicken, and some in grains and vegetables.
Biomarkers (1)
- ALTDeficiency link
Liver enzyme ALT rose within three weeks in men on a choline-restricted diet. ALT is not a test for choline status and rises for many other reasons.
Conditions & symptoms (4)
- Choline DeficiencyDeficiency link
Withholding choline caused liver and muscle damage in controlled studies. True deficiency is rare and there is no routine test.
- Fatty LiverDeficiency link
Fatty liver developed when choline was withheld, including in people fed by vein without it. Most fatty liver in clinics has other causes.
- HypotensionDocumented risk
Low blood pressure was seen at a very large study amount of choline and underlies the adult upper level.
- Muscle DamageDeficiency link
Raised muscle enzyme (creatine phosphokinase) was reported after three weeks of choline restriction.
Documented risks and interactions (2)
- Blood marker TMAO rises with choline bitartrate. In short trials, choline bitartrate raised TMAO, a gut-bacteria-linked blood marker; phosphatidylcholine and eggs did not.
- Risk at very large amounts. A fishy body odour and low blood pressure were seen at very large study amounts. Upper limits apply to total choline from all sources.
Choline is sold in several chemical forms, and they are not interchangeable in research. The trials that exist compared a few forms, mostly in small groups and mostly looking at blood markers. This page explains what the sources show and where Proper evidence not found. It is information only and does not say which form to take; a clinician or pharmacist can help with that decision.
The forms
| Form | What it is, as the sources describe it |
|---|---|
| Free choline (choline salts such as bitartrate and chloride) | Free choline is a water-soluble form that occurs in foods. [1] Choline chloride is the form most commercial infant formulas add. [2] Choline bitartrate was used in the trials below. [3] |
| Phosphatidylcholine (PC), also called lecithin | The main form in foods and the main form in animal tissues; it is lipid-soluble. [1] A phosphatidylcholine capsule (750 mg) was tested in a pregnancy trial. [4] |
| Citicoline (CDP-choline) | Occurs in food in only minor amounts. [1] Sold as a cognition-focused product; see citicoline and alpha-GPC. |
| Alpha-GPC | A cognition-focused product, covered on the same page as citicoline. |
How much choline each form provides by weight: Proper evidence not found. None of the sources read stated percentages, so check the amount of choline the label itself states. Product labels differ, so read them carefully (reading supplement labels).
Why form matters: absorption
Water-soluble forms reach the liver through the portal circulation, while lipid-soluble forms are packaged into chylomicrons and travel through the lymphatic system. [2] Reviewers say the form consumed may be relevant at specific life stages. [2]What trials compared
| Question | What the source found | Label |
|---|---|---|
| Single meal with 600 mg choline as bitartrate or phosphatidylcholine, 37 healthy men | Bitartrate gave about three times the blood TMAO response (area under the curve) of no choline or phosphatidylcholine. Gut bacteria differed between high and low TMAO producers. [5] | Biomarker only |
| Four weeks of eggs, bitartrate, phosphatidylcholine or combinations, healthy adults with normal kidney function | TMAO and platelet reactivity rose in all arms containing choline bitartrate; four eggs a day or phosphatidylcholine supplements did not raise them. [3] | Biomarker only |
| Effects on memory, focus or other brain outcomes in healthy adults, by form | Proper evidence not found. A PubMed search for systematic reviews of choline supplements and cognition in healthy adults returned nothing usable. | Marketing claim |
| Phosphatidylcholine in pregnancy and infant development | No difference at 10 and 12 months in 140 women eating about 360 mg of choline a day. [4] | Mixed (see pregnancy) |
TMAO is made by the liver from trimethylamine produced by gut bacteria. [1] The EFSA draft notes that one metabolomic study suggested a link between higher choline intake and cardiovascular disease, and that dietary choline intake was not reported in those studies. [1] A rise in a blood marker is not the same as a heart attack, and the trials above did not measure disease outcomes. Findings for one form should not be applied to another.
Related
Choline overview · Betaine and TMG · Foods high in cholineFrequently asked questions
What is the difference between choline bitartrate and phosphatidylcholine?
Bitartrate is a free, water-soluble form; phosphatidylcholine is the lipid-soluble form that makes up most food choline. [1] In one trial the bitartrate meal gave a larger TMAO response. [5]
Is lecithin the same as choline?
Phosphatidylcholine is also called lecithin in the EFSA draft and is one choline-containing compound. [1] A product labeled lecithin is not automatically the same as a choline supplement; check the label amount.
Do citicoline and alpha-GPC work better for memory?
Proper evidence not found here; see the citicoline and alpha-GPC page.
Do choline supplements raise TMAO?
In a four-week trial, choline bitartrate raised TMAO and phosphatidylcholine did not. [3] The long-term meaning is not established.
Which form is best?
There is no universal winner. Trials compared few forms and measured mostly blood markers. A clinician or pharmacist can advise on your situation.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
How to read the evidence labels
Labels used on this page: established nutritional role, promising but limited, mixed, insufficient evidence, marketing claim.
Safety
- Upper levels apply to total choline from all sources: for example 3,500 mg a day for US and Canadian adults. [6] More on intake levels.
- Side effects: a fishy body odor and low blood pressure were seen at very large study amounts of choline. [1]
- Medicines, pregnancy, children, kidney and liver conditions, surgery: Proper evidence not found for form-specific advice in the sources read. Ask a clinician or pharmacist and see medication interactions and quality testing. Tell the surgical team about supplements (vitamins before surgery).
- Children: keep supplements out of reach; for swallowed supplements call Poison Help at 1-800-222-1222 (US).
References
- European Food Safety Authority (EFSA), NDA Panel. Draft scientific opinion on Dietary Reference Values for choline (public consultation draft, February 2016). A consultation draft, not the final opinion; the final opinion page could not be read. Read 2026-10-23.
- Dietary Choline Intake: Current State of Knowledge Across the Life Cycle. Nutrients 2018 (review). Read 2026-10-23.
- Dietary Choline Supplements, but Not Eggs, Raise Fasting TMAO Levels in Participants with Normal Renal Function: A Randomized Clinical Trial. Am J Med 2021. Read 2026-10-23.
- Phosphatidylcholine supplementation in pregnant women consuming moderate-choline diets does not enhance infant cognitive function. Am J Clin Nutr 2012. Read 2026-10-23.
- Effect of Choline Forms and Gut Microbiota Composition on Trimethylamine-N-Oxide Response in Healthy Men. Nutrients 2020. Read 2026-10-23.
- Health Canada. Dietary reference intakes tables: Reference values for vitamins. Page dated 2025-11-19; the choline values are the US and Canada Dietary Reference Intakes. Read 2026-10-23 through a web-fetch tool.