Choline

What is choline?

Choline is an essential nutrient, meaning the body cannot make enough of it on its own and needs some from food. It is used to build phosphatidylcholine and sphingomyelin, two major components of cell membranes, and to make acetylcholine, a neurotransmitter involved in memory, mood and muscle control. Good food sources include eggs, meat, fish, dairy, soybeans and cruciferous vegetables.

What the research says

Choline has a genuine link to liver health, which is why it appears in liver formulas. According to the NIH Office of Dietary Supplements, phosphatidylcholine is essential for transporting fat out of the liver, so in choline deficiency fat accumulates in the liver. A controlled inpatient study of 15 women placed on choline-depleted diets showed that people developed different degrees of liver fat, depending on their genetics and gut bacteria.

ODS also describes a large observational study in China in which people with the highest dietary choline intakes had a lower risk of fatty liver than those with the lowest intakes. Observational data like this cannot prove cause and effect, and there is little trial evidence that taking extra choline supplements improves liver fat or body weight in people whose diets already provide enough.

The practical takeaway is that adequate choline matters for the liver, and many people fall short of the recommended intake, but choline is a nutrient to get right rather than a fat burner.

How it’s used in supplements

Choline appears in supplements as choline bitartrate, choline chloride, citicoline, alpha-GPC and phosphatidylcholine (lecithin). ODS lists the Adequate Intake as 425 mg per day for adult women and 550 mg for adult men, with higher needs during pregnancy and breastfeeding. Multi-ingredient capsules typically contain only a fraction of that.

Too much choline has downsides. ODS reports that high intakes are associated with a fishy body odor, vomiting, excessive sweating and salivation, low blood pressure and liver toxicity, and that choline increases production of TMAO, a compound linked to higher cardiovascular risk. The upper limit for adults is 3,500 mg a day from food and supplements combined. Anyone with a liver condition should be guided by their doctor.

Bottom line: choline is genuinely important for liver function, and many people do not reach the recommended intake. The most reliable way to cover your needs is through foods such as eggs, fish, meat, dairy, soybeans and cruciferous vegetables. Supplemental choline in small amounts is unlikely to change liver fat or body weight in people who already eat enough, and very high intakes carry their own risks.