Choline: the nutrient most people have never counted

Choline is a nutrient the body uses for several distinct jobs at once. It is a building block for phosphatidylcholine, a phospholipid used to construct cell membranes throughout the body, including nerve tissue. It is the raw material for acetylcholine, a neurotransmitter involved in attention, learning and muscle signalling. And it plays a role in transporting fat out of the liver and in regulating homocysteine, an amino acid linked, at high levels, to cardiovascular risk.

In Great Britain, choline carries three authorised claims that reflect this: it contributes to normal lipid metabolism, to normal homocysteine metabolism, and to normal liver function. These are specific, assessed statements — not a general 'good for the brain' claim, though the acetylcholine pathway is the reason it appears so often in cognition-focused formulas.

European intake surveys have repeatedly found average choline intakes below the adequate intake figures set for adults, particularly among people who eat few eggs or little meat. This is not unique to vegans and vegetarians — plenty of omnivores who simply do not eat many eggs, liver or oily fish fall into the same pattern, since the richest sources are concentrated in a fairly narrow group of animal foods.

Pregnancy increases choline requirements notably, since it plays a documented role in fetal brain and spinal cord development. Anyone pregnant should discuss appropriate intake with a midwife or GP rather than relying on an over-the-counter supplement without guidance.

Before considering a supplement, it is worth knowing where choline actually sits in an ordinary UK diet, since a few simple food choices can close most of the gap for many people.

Choline bitartrate, citicoline (CDP-choline) and alpha-GPC are the common supplement forms, and they differ in how much elemental choline they actually deliver per milligram of the compound, in cost, and in how readily some forms are thought to reach brain tissue compared with others in early research.

Choline bitartrate is the least expensive and most widely used in general supplements, delivering a smaller proportion of elemental choline per milligram of compound than citicoline or alpha-GPC, which are more costly but more concentrated sources of the actual nutrient. Whichever form a label lists, look specifically for the amount of choline provided rather than the total weight of the compound, since these are not the same number and the difference can be substantial.

There is a UK adequate intake figure for choline, and supplement products vary widely in how close they come to it, from small top-up amounts of under 50mg to formulas providing several hundred milligrams. Check the specific milligram amount of elemental choline stated on the supplement facts panel, not the compound name alone, and be wary of totals folded into a combined 'brain complex' figure.

Choline is generally considered safe within typical dietary and supplement amounts, but there is an established tolerable upper intake level above which side effects become more likely, including a fishy body odour, sweating, low blood pressure and gastrointestinal upset. This odour effect occurs because at high doses, gut bacteria convert excess choline into trimethylamine, which the body then excretes partly through sweat and breath.

This is a genuine reason not to assume 'more is better' with choline supplements, and it is one of the more practical, if unglamorous, reasons to stick to sensible, published amounts rather than stacking multiple choline-containing products together without checking the combined total.

A plant-based diet makes it easier to fall short of adequate choline intake, since the richest sources are animal foods. Soya beans, quinoa, broccoli and other cruciferous vegetables provide some choline, but generally not at the concentration eggs and liver do, so vegans and vegetarians who want to check their intake may find a supplement a reasonable, low-risk way to close a genuine, diet-based gap.

Choline requirements rise during pregnancy because of its role in fetal neural development, and UK dietary surveys suggest many pregnant women do not reach recommended intakes through diet alone. This is a case where speaking to a midwife or GP about diet and supplementation specifically is more useful than choosing an over-the-counter product independently, since pregnancy nutrition advice should be tailored rather than generic.

Choline, phosphatidylserine and DHA are all connected to cell membrane biochemistry — choline and phosphatidylserine are both used in building phospholipids, and DHA is one of the fats that makes up those same membranes. This is a common and biochemically sensible reason to combine them in a formula, as Enervia does, rather than using any one alone.

It is a formulation rationale, not a guarantee of a combined effect beyond the individual authorised claims for choline and DHA — no claim is authorised for the combination itself, and we would rather say that plainly than let the pairing imply more than the evidence supports.