Vitamin A While Trying to Conceive: Retinol vs. Beta-Carotene in Prenatals, Cod Liver Oil, and Liver

Short answer: vitamin A comes in two forms, and they're treated very differently around conception. Preformed vitamin A (retinol and retinyl esters, found in animal foods, cod liver oil and many supplements) has an upper limit of 3,000 mcg RAE (10,000 IU) a day for adults, including during pregnancy, because intakes above it can cause birth defects. Beta-carotene, the plant form, has no upper limit and isn't known to cause birth defects. So when you read a prenatal label, the question isn't just "how much vitamin A?" but "how much of it is preformed?"

Figures in this guide come from the NIH Office of Dietary Supplements (ODS) vitamin A fact sheet, which we checked in October 2026 (the fact sheet itself was last updated March 10, 2025).

The numbers that matter

The RDA is the amount most people should aim for. The UL is the ceiling for daily preformed intake from supplements and animal foods. ODS notes that intakes of preformed vitamin A above the UL, as well as certain retinoid medications such as isotretinoin, can cause birth defects affecting the eyes, skull, lungs and heart. Experts advise people who are or might be pregnant not to exceed 3,000 mcg RAE (10,000 IU) a day from supplements.

Because the critical window for many of these defects is very early, often before a pregnancy test turns positive, the time to check your total is while you're trying, not after you find out.

Retinol vs. beta-carotene: how to tell them apart on a label

Supplement labels now list vitamin A in micrograms of retinol activity equivalents (mcg RAE), though older labels and some imports still show IU. Under the amount, many labels name the form. Look for these words:

• Preformed: retinol, retinyl acetate, retinyl palmitate. These count toward the UL.
• Provitamin A: beta-carotene (sometimes "as beta-carotene" or "from beta-carotene"). This doesn't count toward the UL.
• Mixed: some labels split the amount, for example "50% as beta-carotene, 50% as retinyl acetate." Only the retinyl part counts toward the UL.

If a label gives a single vitamin A number with no form listed, assume you don't know and ask the manufacturer or your clinician. For other prenatal label lines, our prenatal ingredient decoder and supplement label cheat sheet go line by line.

Unit conversions you might need

• 1 IU of retinol = 0.3 mcg RAE. So 10,000 IU of retinol = 3,000 mcg RAE.
• 1 mcg RAE = 2 mcg of supplemental beta-carotene.
• 1 mcg RAE = 12 mcg of beta-carotene from food.

ODS notes that multivitamins often provide 750 to 1,050 mcg RAE of vitamin A, and standalone vitamin A supplements commonly provide about 3,000 mcg RAE. That second group is the one to watch: a standalone retinol product on top of a prenatal can put you over the UL from supplements alone.

The stacking problem: prenatal + cod liver oil + liver + skincare

Most people don't exceed the UL from a single source. They get there by stacking.

Cod liver oil

Cod liver oil is a concentrated source of preformed vitamin A, and it's often taken for its omega-3s. Amounts vary widely between brands and between liquid and capsule forms, so check the label's vitamin A line and add it to your prenatal's preformed amount. If omega-3s are your goal, a fish oil or algae oil that isn't made from liver typically contains little or no vitamin A. Our omega-3 and DHA guide compares the options.

Liver and liver products

Liver is one of the richest food sources of preformed vitamin A. ODS lists a 3-ounce serving of pan-fried beef liver at about 6,582 mcg RAE, more than double the daily UL for preformed vitamin A in one portion. Pâté, liver sausage and "beef organ" capsules are also concentrated. If you eat liver or take organ supplements, discuss how often with your clinician while trying to conceive.

Skincare and acne medications

Prescription oral retinoids such as isotretinoin are known to cause birth defects and come with strict pregnancy-prevention requirements. Topical retinoids are a separate conversation to have with your prescriber before you start trying. howtohaveababy.com covers acne medications while trying to conceive, and fertilestart.com has a broader list of medications to review when TTC.

A worked example (hypothetical numbers)

Say your prenatal lists 900 mcg RAE of vitamin A, "50% as beta-carotene and 50% as retinyl acetate." Only 450 mcg RAE of that counts toward the UL. Now add a cod liver oil whose label lists 1,000 mcg RAE per serving: you're at 1,450 mcg RAE of preformed vitamin A from supplements. Add a standalone "immune" vitamin A capsule at 3,000 mcg RAE and you're at 4,450, well over the UL before counting any food. Remove that capsule and you're back under it. These numbers are illustrations; use the amounts printed on your own labels.

A five-minute vitamin A audit

1. Collect every bottle: prenatal, multivitamin, cod liver oil, "immune" products, hair and skin supplements, organ capsules.
2. Find the vitamin A line on each, in mcg RAE (convert IU if needed).
3. Split it by form. Write down only the preformed part (retinol, retinyl acetate, retinyl palmitate).
4. Add up the preformed amounts. Compare the supplement total to 3,000 mcg RAE, keeping in mind that animal foods add more.
5. Note diet sources: how often you eat liver, liver products or cod liver oil.
6. List any retinoid medications, oral or topical.
7. Bring the list to your clinician. Our supplement list for doctor review has a format that works.

Choosing a prenatal with vitamin A in mind

When you compare prenatals, check three things on the vitamin A line: the total in mcg RAE, the form (or split), and whether the amount is close to the pregnancy RDA of 770 mcg RAE rather than far above it. Many prenatals use beta-carotene for some or all of their vitamin A for exactly this reason. Our prenatal vitamins guide compares labels side by side, and fertilestart.com's ranked prenatal list offers a second view.

Vitamin A is one line on the label. Choline, iodine, folate and DHA deserve the same attention; see our choline label guide for the nutrient prenatals most often shortchange.

When to see a doctor: if you've been taking a high-dose preformed vitamin A product or an oral retinoid and could be pregnant, contact your clinician promptly rather than waiting for your next appointment.

Sources

• NIH Office of Dietary Supplements. Vitamin A and Carotenoids: fact sheet for health professionals (updated March 10, 2025). ods.od.nih.gov