Vitamin A is found in two forms across a wide range of foods: preformed vitamin A (retinol) in animal products like liver, eggs, and dairy, and provitamin A (beta-carotene) in orange, red, and dark green fruits and vegetables. Most people can meet their daily needs through a varied diet without supplements.
Two Forms of Vitamin A in Food
The vitamin A in food comes in two fundamentally different packages. Animal foods contain retinol, which is the active form your body can use immediately. Plant foods contain beta-carotene and related compounds, which your body converts into retinol after digestion. This distinction matters because the conversion from beta-carotene to usable vitamin A is not one-to-one. It takes about 12 micrograms of beta-carotene from food to produce 1 microgram of usable vitamin A. Supplemental beta-carotene converts more efficiently, at a 2-to-1 ratio.
This is why nutritional labels use a standardized unit called retinol activity equivalents (RAE) to put both forms on equal footing. When you see vitamin A listed on a food label, the number already accounts for these conversion differences.
Best Animal Sources
Liver is by far the most concentrated source of vitamin A in the human diet. Beef liver contains roughly 6,000 to 9,000 mcg RAE per 3-ounce serving, which is several times the daily recommended intake in a single portion. Lamb and sheep liver are similarly rich. Even among muscle meats, lamb tends to store more retinol than beef or buffalo.
Beyond organ meats, these animal foods are reliable sources:
- Eggs: One large egg provides about 75 to 90 mcg RAE, mostly in the yolk.
- Dairy: Whole milk, butter, and cheese all contain retinol. Many reduced-fat and skim milks are fortified with vitamin A to replace what’s lost when the fat is removed.
- Fish: Salmon, tuna, and mackerel provide moderate amounts, while cod liver oil is an extremely concentrated source.
Because animal-based vitamin A is already in its active form, your body absorbs and uses it efficiently. This also means it’s easier to get too much from animal sources and supplements than from plant foods.
Best Plant Sources
Orange and dark green vegetables are the richest plant sources of beta-carotene. The deeper the color, the higher the concentration tends to be. Per cup, the standout foods are:
- Sweet potato (baked): 23,018 mcg of beta-carotene
- Carrots: 10,605 mcg of beta-carotene
- Butternut squash (cooked): 9,369 mcg of beta-carotene
- Cantaloupe: 3,575 mcg of beta-carotene
- Romaine lettuce: 2,456 mcg of beta-carotene
A single baked sweet potato delivers well over the daily recommended amount even after accounting for the conversion ratio. Spinach, kale, red bell peppers, and mangoes are also excellent sources. One practical advantage of getting vitamin A from plants: your body regulates the conversion of beta-carotene and slows it down when stores are adequate, which makes overdose from plant foods essentially impossible.
How Much You Need Daily
The recommended daily intake for adult men is 900 mcg RAE. For adult women, it’s 700 mcg RAE. Pregnant individuals need slightly more, around 770 mcg RAE. These numbers are easy to reach through food alone. A half-cup of cooked sweet potato or a cup of raw carrots gets you most of the way there in a single serving.
Getting enough matters because vitamin A plays a central role in vision. Inside your eyes, a form of vitamin A called 11-cis-retinal binds to a protein called opsin, and together they form rhodopsin, the pigment your rod cells use to detect light in dim conditions. Without enough vitamin A, this process breaks down and night vision deteriorates. Vitamin A also supports your immune system, skin cell turnover, and reproductive health.
What Deficiency Looks Like
Vitamin A deficiency develops gradually. The earliest sign is typically night blindness, where your eyes struggle to adjust in low light. As the deficiency worsens, you may notice increased frequency of respiratory, digestive, or urinary infections because the immune system depends on adequate vitamin A to function. Skin often becomes dry and rough.
In more severe cases, the eyes themselves are affected. Foamy, triangular patches called Bitot spots can appear on the white of the eye. The surface of the eye dries out and, if the deficiency persists, corneal ulcers and permanent scarring can develop. Severe deficiency remains a leading cause of preventable blindness in low-income countries, particularly among children. In wealthier nations, deficiency is uncommon but can occur in people with conditions that impair fat absorption, such as celiac disease, Crohn’s disease, or chronic liver problems.
Tips for Better Absorption
Vitamin A is fat-soluble, meaning it dissolves in fat rather than water. Your body absorbs it much more effectively when you eat it alongside some dietary fat. The good news is you don’t need much. As little as 3 to 5 grams of fat in a meal is enough to significantly boost absorption. That’s roughly a teaspoon of olive oil, a small pat of butter, or a few slices of avocado.
This is especially relevant for plant-based sources. A plain raw carrot on its own delivers less usable vitamin A than the same carrot dipped in hummus or dressed with a bit of oil. Cooking also helps by breaking down plant cell walls and making beta-carotene more accessible. Roasted sweet potatoes with a drizzle of oil are one of the most efficient ways to get your vitamin A from plants.
Can You Get Too Much?
Overdoing it with preformed vitamin A from animal foods or supplements is possible and potentially harmful. Chronic excess can cause nausea, headaches, joint pain, and liver damage. During pregnancy, too much preformed vitamin A is linked to birth defects, which is why pregnant individuals are often advised to avoid liver and high-dose vitamin A supplements.
Beta-carotene from plant foods does not carry this risk. The worst that happens with very high beta-carotene intake is a harmless orange tint to the skin, particularly on the palms and soles of the feet. It fades once you cut back. For most people, eating a colorful mix of vegetables and moderate amounts of animal products keeps vitamin A intake in a safe, effective range without any need for supplements.