Is liver safe during pregnancy?

The verdict

No. Liver is the one food the NHS asks you to give up on nutritional rather than microbiological grounds, and the reason is vitamin A.

That covers liver itself - lamb's, calf's, chicken, pig's - and liver products: liver pâté, liverwurst, haggis, faggots, liver sausage, and fish liver oils such as cod liver oil. The NHS lists "liver and liver products" as a single entry on the avoid side.

Everything else about liver is genuinely good. It is one of the richest dietary sources of iron, folate, B12 and choline, all of which matter in pregnancy. None of that changes the answer, because the vitamin A comes in the same package.

Why vitamin A, and which kind

There are two dietary forms of vitamin A and only one is a problem.

Preformed vitamin A (retinol) comes from animal sources - liver above all, then dairy fat, egg yolk and fish liver oils. The body absorbs it directly and stores it. It has no safety valve.

Provitamin A carotenoids, mainly beta-carotene, come from plants: carrots, sweet potato, spinach, mango. The body converts these into retinol only as needed, and conversion slows when stores are adequate. You cannot cause vitamin A toxicity by eating carrots, and no authority sets an upper limit for beta-carotene.

Retinol at high doses is a recognised human teratogen. Retinoic acid, its active metabolite, is a signalling molecule controlling how the early embryo lays out its head, heart and nervous system. Too much during organogenesis disrupts that patterning. The malformations involved derive from cranial neural crest cells: craniofacial defects, heart defects, thymic abnormalities and central nervous system malformations. Neural tube defects are specifically not part of the vitamin A pattern, which is often got wrong.

The evidence base is one large study everybody's number traces back to. Rothman and colleagues followed 22,748 pregnancies and found that among women taking more than 10,000 IU a day of vitamin A from supplements, the prevalence of cranial-neural-crest defects was 4.8 times that among women taking 5,000 IU or less (95% CI 2.2 to 10.5). They identified an apparent threshold near 10,000 IU a day, and found the excess concentrated among women whose high intake occurred before the seventh week of gestation.

That early window is why the advice is framed as avoid rather than reduce. By the time most people know they are pregnant, much of the sensitive period has passed.

How much is too much

• What you need: the NHS puts adult requirements at 600 micrograms a day for women and 700 for men. A normal mixed diet covers it.
• The international upper limit: 3,000 micrograms a day of preformed vitamin A, equal to 10,000 IU. The NIH Office of Dietary Supplements, the US Institute of Medicine, Health Canada, EFSA and Australia's NHMRC all publish the same figure, and all of them lower it to 2,800 micrograms for pregnant people aged 14 to 18. EFSA re-examined it in 2024 and kept it. This is about as settled as nutritional toxicology gets.
• The UK number is half that, and measures something else. The NHS says an average of 1.5mg (1,500 micrograms) a day or less from diet and supplements combined is unlikely to cause harm - but that figure comes from bone density and fracture risk, not from teratogenicity. The UK has never set a formal upper limit for vitamin A. A UK reader and a US reader are working to numbers two-fold apart, derived from different endpoints.
• Liver against those numbers: UK food composition data puts fried lamb's liver at 19,700 micrograms of retinol per 100g. That is 6.6 times the 3,000 microgram upper limit in a single portion, and 33 times the daily requirement for women. Liver pâté runs at 7,300 micrograms per 100g, so a 40g serving is around 2,900 micrograms - essentially a full day's ceiling in one ramekin.
• Real-world intakes confirm it. UK National Diet and Nutrition Survey data for women aged 16 to 49 who eat liver puts mean vitamin A exposure from liver alone at 3,500 micrograms a day. The average liver eater is already over the limit from liver alone.

The NHS makes the general-population allowance explicit and then withdraws it for pregnancy. Its vitamin A page tells everyone not to eat liver or liver products such as pâté more than once a week, and says separately that if you are pregnant you should avoid eating liver or liver products altogether.

What about cod liver oil

Supplements are outside this site's scope, but the NHS advice is short enough to state: do not take cod liver oil in pregnancy, because it is a fish liver oil and carries the same retinol load as the organ it came from. Check any supplement label for retinol or retinyl palmitate and take the question to your midwife.

If you have already eaten liver

One meal is not the scenario the guidance is written against. The doses in the human evidence base are far above a single serving, and the concern is habitual intake across the first weeks. There is no test, no treatment and nothing to undo.

What to do is stop, and look at everything else contributing retinol - a multivitamin that is not pregnancy-specific, or cod liver oil. Removing those is a bigger intervention than worrying about a meal already eaten. If you have been eating liver several times a week, mention it at your next antenatal appointment so it is on the record.

Where guidance genuinely differs

This is the sharpest food-level contradiction on the site, and it is not a case of one country being out of date.

The UK says avoid liver entirely. The NHS lists liver and liver products under foods to avoid. The Committee on Toxicity reviewed the position in its 2022 statement on excess vitamin A and maternal health and concluded that the current UK Government advice for pregnant women and those planning pregnancy to limit their consumption of preformed vitamin A remains appropriate.

ACOG recommends eating liver. Not permits - recommends. Its healthy eating guidance for pregnancy, updated in 2026, names beef liver as a source of choline, lists liver among foods high in B vitamins, and lists liver among iron-rich foods to eat. Its only vitamin A caution concerns supplements, and carries no number: some multivitamin ingredients, such as vitamin A, can cause birth defects if you double or triple the dose. No US federal consumer authority - not the FDA, CDC, foodsafety.gov or USDA - publishes any advice to limit liver in pregnancy at all.

New Zealand publishes a weekly portion instead. Its Safe and Healthy Eating in Pregnancy booklet says liver is a good source of iron but to eat no more than a small piece, 100g, once a week, because it has lots of vitamin A which can be harmful to an unborn baby. That is the only liver portion figure for pregnancy published anywhere, and it sits directly against the UK's avoid.

The EU splits the difference by population. EFSA's 2024 opinion advises the general European population to limit liver and offal to once per month or less - four times stricter than the NHS's once-a-week line - while advising women planning a pregnancy or already pregnant not to consume liver, offal or products thereof at all.

Australia is closer to the US. FSANZ publishes nothing on liver or vitamin A in pregnancy, and the Australian Pregnancy Care Guidelines name beef liver positively as a folate source. NHMRC sets the 3,000 microgram ceiling with teratogenicity as the critical adverse effect, but attaches no food rule to it.

Everyone agrees on the number and disagrees on what to do with it. If you want one rule that satisfies the strictest reading: no liver, no liver products, no fish liver oil.