Vitamin A Deficiency: Symptoms, Causes, and Best Food Sources

Vitamin A is one of the four fat-soluble vitamins — along with D, E, and K — and it plays a central role in vision, immune defense, skin health, and cell growth. Despite its importance, vitamin A deficiency remains the leading cause of preventable blindness in children worldwide, according to the World Health Organization. In developed countries, outright deficiency is less common, but subclinical insufficiency — where levels are low enough to impair function without causing obvious symptoms — is more prevalent than most people realize.

Understanding vitamin A requires grasping a key distinction: there are two forms. Preformed vitamin A (retinol and retinyl esters) comes from animal foods and is immediately usable by your body. Provitamin A carotenoids (most notably beta-carotene) come from plant foods and must be converted to active vitamin A in your small intestine. This conversion is inefficient — you need approximately 12 micrograms of dietary beta-carotene to produce 1 microgram of active retinol — which is one reason plant-based diets require careful planning to meet vitamin A needs.

This guide covers everything you need to know: what vitamin A does, the warning signs of deficiency, who is most at risk, how much you need, and the best food sources to keep your levels optimal. For a broader view of micronutrient tracking, see our guide on how to track micronutrients.

What Vitamin A Does in Your Body

Vitamin A is far more than a vision nutrient. Here are its major biological roles:

Vision — Especially in Low Light

Vitamin A is a structural component of rhodopsin, the light-sensitive pigment in the rod cells of your retina. Rod cells handle vision in dim light. When vitamin A levels drop, rhodopsin production falls, impairing your ability to adapt to darkness. This is called night blindness (nyctalopia) — one of the earliest and most recognizable signs of deficiency. Without intervention, severe deficiency leads to xerophthalmia (dry eyes), corneal ulcers, and ultimately irreversible blindness.

Immune System Function

Vitamin A maintains the integrity of mucosal surfaces — the linings of your respiratory tract, gastrointestinal tract, and urinary system that serve as your body's first barrier against pathogens. It also supports the differentiation and function of white blood cells, including T cells and B cells. According to the NIH Office of Dietary Supplements, deficiency increases susceptibility to infections including measles and diarrheal disease and raises mortality risk from these conditions in children.

Skin and Cell Growth

Retinoic acid, an active form of vitamin A, regulates gene expression involved in cell differentiation and proliferation. This is why retinoids (synthetic derivatives of vitamin A) are used in dermatology for acne treatment and anti-aging skincare. Internally, vitamin A supports the healthy turnover of skin cells and the maintenance of mucous membranes throughout the body.

Reproduction and Fetal Development

Vitamin A is essential for normal sperm and egg development in both sexes. During pregnancy, retinoic acid is critical for fetal organ development, including the heart, lungs, kidneys, eyes, and limbs. However, excessive vitamin A intake during pregnancy is teratogenic — meaning very high doses can cause birth defects — making the balance between adequacy and excess particularly important in pregnant women.

Vitamin A Deficiency Symptoms: Warning Signs to Watch For

Symptoms of vitamin A deficiency develop progressively. Early signs are subtle; severe deficiency produces dramatic, often irreversible damage.

1. Night Blindness

This is typically the first symptom to appear. You may notice difficulty driving at night, slow adaptation when moving from a bright environment to a dark one, or trouble seeing in dimly lit restaurants. Night blindness from vitamin A deficiency is reversible with prompt treatment, but it signals that depletion has already reached a functionally significant level.

2. Dry Eyes and Bitot's Spots

Dry, rough, or burning eyes that do not improve with hydration may indicate insufficient vitamin A to maintain the mucous membranes of the eye. In more advanced deficiency, white foamy patches called Bitot's spots appear on the whites of the eyes — a clear clinical sign visible to ophthalmologists and a hallmark indicator of significant deficiency.

3. Frequent Infections

Because vitamin A is essential for maintaining mucosal barriers and immune cell function, deficiency significantly increases infection risk. If you seem to catch every respiratory illness that circulates, or if infections are slow to resolve, consider whether suboptimal vitamin A levels could be contributing. This is especially relevant alongside other nutrient deficiencies like vitamin D and zinc, which also support immunity.

4. Dry, Rough, or Bumpy Skin

A condition called follicular hyperkeratosis — small, hard bumps (often mistaken for "chicken skin" or keratosis pilaris) on the arms, thighs, and buttocks — is associated with vitamin A deficiency. The skin becomes rough and scaly because vitamin A-dependent cell turnover slows, causing a buildup of keratin in hair follicles. Dry, flaky skin in other areas is also common.

5. Poor Wound Healing

Vitamin A plays a direct role in skin cell regeneration. When levels are low, wounds heal more slowly because the cycle of skin cell replacement is impaired. This is particularly relevant for post-surgical recovery and for people with chronic skin conditions.

6. Acne and Skin Blemishes

This may seem counterintuitive given that high-dose vitamin A derivatives are used to treat acne, but subclinical deficiency can actually worsen acne by slowing normal skin cell turnover and promoting clogged pores. The relationship between dietary vitamin A and skin health is complex, but ensuring adequate intake is a reasonable first step before exploring other interventions.

7. Stunted Growth in Children

Vitamin A is essential for normal bone remodeling and growth. Children with chronic deficiency grow more slowly and are at higher risk of infectious diseases that further impair development. This is primarily a concern in developing countries, but it reinforces the importance of adequate vitamin A in all growing children.

Who Is Most at Risk for Vitamin A Deficiency?

• People with fat malabsorption disorders: Crohn's disease, celiac disease, cystic fibrosis, and chronic pancreatitis impair absorption of all fat-soluble vitamins, including A. If you have one of these conditions, regular monitoring of vitamin A status is important.
• Strict vegans and plant-based eaters: Because plant foods only contain provitamin A carotenoids (which convert inefficiently), vegans who do not eat a variety of orange, yellow, and dark green vegetables may not meet their needs.
• Pregnant and breastfeeding women: Demand for vitamin A increases during pregnancy (for fetal development) and lactation (lost through breast milk). However, excess is also dangerous — the recommended upper limit is strictly maintained in these groups.
• Heavy alcohol users: Alcohol interferes with vitamin A metabolism and storage. The liver, which stores vitamin A, is directly damaged by chronic alcohol use, leading to both impaired storage and increased clearance of the vitamin.
• People with zinc deficiency: Zinc is required for the synthesis of retinol-binding protein, which transports vitamin A in the bloodstream. A zinc deficiency can cause a functional vitamin A deficiency even when vitamin A intake is adequate. See our guide on zinc deficiency for more.

How Much Vitamin A Do You Need Per Day?

Vitamin A is measured in micrograms of Retinol Activity Equivalents (RAE), a unit that accounts for the different bioavailabilities of preformed vitamin A and provitamin A carotenoids. Here are the current Recommended Dietary Allowances from the NIH ODS:

Life Stage	RDA (mcg RAE/day)	Tolerable Upper Limit (mcg RAE/day)
Children 1–3 years	300	600
Children 4–8 years	400	900
Children 9–13 years	600	1,700
Males 14–18 years	900	2,800
Females 14–18 years	700	2,800
Males 19+ years	900	3,000
Females 19+ years	700	3,000
Pregnant women (19+)	770	3,000
Breastfeeding women (19+)	1,300	3,000

Important note on toxicity: Unlike water-soluble vitamins, excess vitamin A cannot be excreted in urine. It accumulates in the liver and can reach toxic levels (hypervitaminosis A) from supplementation. Symptoms of acute toxicity include nausea, dizziness, headaches, and blurred vision. Chronic toxicity from sustained over-supplementation can cause liver damage, bone pain, and — in pregnant women — serious birth defects. This is why the upper limit matters as much as the RDA. Getting vitamin A from food alone rarely causes toxicity; it is almost exclusively a supplementation concern.

Best Food Sources of Vitamin A

Here are the top food sources of both preformed vitamin A and provitamin A carotenoids, from USDA FoodData Central:

Food	Serving Size	Vitamin A (mcg RAE)	% Daily Value (700 mcg)
Beef liver, cooked	3 oz (85 g)	6,582	940%
Sweet potato, baked	1 medium (130 g)	961	137%
Spinach, cooked	1/2 cup (90 g)	573	82%
Carrots, raw	1/2 cup (61 g)	459	66%
Pumpkin, canned	1/2 cup (123 g)	953	136%
Cantaloupe	1/2 cup (80 g)	135	19%
Kale, raw	1 cup (21 g)	62	9%
Whole milk	1 cup (244 mL)	112	16%
Butter	1 tablespoon (14 g)	97	14%
Egg yolk (large)	1 yolk	75	11%
Mozzarella cheese	1 oz (28 g)	56	8%

Key insight: Beef liver is dramatically higher in vitamin A than any other food — a single 3-ounce serving provides nearly 10 times the daily requirement. This is also why liver is the primary food source associated with vitamin A toxicity if consumed excessively. One to two servings per week is more than adequate. Sweet potatoes, pumpkin, and cooked spinach are the standout plant-based sources, providing close to or exceeding 100% DV per serving.

Fat-soluble vitamins like vitamin A are absorbed much more efficiently when consumed with dietary fat. Drizzle olive oil on your cooked spinach, add avocado to your sweet potato, or pair your carrots with a small amount of fat-containing food to maximize absorption — this is especially important for plant-based vitamin A sources.

Vitamin A and Other Micronutrients: The Interactions You Need to Know

Vitamin A does not work in isolation. Several key interactions affect how much you absorb and how well it functions:

• Zinc and vitamin A: Zinc is needed to produce retinol-binding protein, which transports vitamin A in the blood. Low zinc impairs vitamin A transport and utilization even when intake is sufficient. If you are low in both, addressing zinc deficiency first can improve vitamin A status without additional supplementation.
• Vitamin D and vitamin A: These two fat-soluble vitamins share overlapping gene regulation pathways and appear to balance each other's effects. High-dose supplementation of one without the other may cause imbalances — another reason food-first strategies are preferred.
• Iron and vitamin A: Vitamin A deficiency often coexists with iron deficiency. Vitamin A facilitates iron absorption from the gut and reduces the inhibitory effect of certain plant compounds on iron bioavailability. Correcting vitamin A deficiency can improve iron status even without increasing iron intake.

Frequently Asked Questions About Vitamin A

Can you get enough vitamin A from a plant-based diet?

Yes, but it requires planning. Since plant foods contain only beta-carotene (which converts to vitamin A at roughly a 12:1 ratio), plant-based eaters need to consistently consume beta-carotene-rich foods: sweet potatoes, carrots, pumpkin, spinach, and kale. Genetic variation in the BCMO1 enzyme — which converts beta-carotene to retinol — means some individuals (poor converters) may need to rely more on fortified foods or supplements even with adequate plant-based intake.

How do I know if I am vitamin A deficient?

Serum retinol is the standard blood test, though it does not accurately reflect liver stores until deficiency is quite advanced. A level below 0.70 micromol/L is considered deficient by the WHO. If you have risk factors (fat malabsorption, restricted diet, night blindness symptoms), discuss testing with your doctor. Tracking dietary intake using a comprehensive nutrition app like Acai gives you a running picture of whether you are consistently hitting your vitamin A target before deficiency develops.

Is it safe to take vitamin A supplements?

It depends on the dose and form. Beta-carotene supplements are generally safe, as excess beta-carotene is not converted to toxic levels of active vitamin A (though high-dose beta-carotene supplementation is associated with increased lung cancer risk in smokers). Preformed vitamin A supplements (retinol) carry a real risk of toxicity at doses above 3,000 mcg RAE/day. Most multivitamins contain 750–900 mcg RAE — within the safe range. High-dose preformed vitamin A supplements (10,000+ IU) should only be used under medical supervision.

Does cooking destroy vitamin A?

Vitamin A and beta-carotene are relatively heat-stable. However, light and oxygen exposure can degrade them over time. Cooked carrots and sweet potatoes actually have higher bioavailable beta-carotene than raw, because cooking breaks down cell walls and releases carotenoids. The efficiency of absorption also increases when eaten with fat, as noted above.

Making Sure You Get Enough Vitamin A

Vitamin A deficiency is preventable with a well-balanced diet that includes orange and yellow vegetables, leafy greens, and at least occasional animal-source foods or fortified products. The key is consistency — eating these foods most days, not occasionally. Because vitamin A is fat-soluble and can be stored in the liver, you do not need to hit the exact target every single day, but your weekly average should be in range.

The challenge is that most people have no idea how much vitamin A they are actually eating. A nutrition app that tracks your full micronutrient intake — including vitamin A, alongside the 244 other nutrients that matter for your health — makes it easy to see at a glance whether you are hitting your targets or falling short week after week. That kind of visibility is what turns vague nutritional awareness into actionable health improvement. Download Acai to start tracking your complete micronutrient profile today.