Vitamin A – Sources, Benefits, and Cautions

4/30/2026   By Jane Jackson, RN, CRC – BHealthyRN

Vitamin A is essential to our well‑being. A vitamin is an organic compound needed in small amounts for the body to function properly—supporting growth, metabolism, and overall health. Because the body cannot make enough of it on its own, vitamin A must come from food or supplements.

Vitamin A exists in two forms:

• Animal‑sourced (preformed vitamin A): retinol, retinal, retinoic acid, and retinyl esters
• Plant‑sourced (provitamin A carotenoids): beta‑carotene and related compounds that the body converts into retinol

🥕 Food Sources of Vitamin A

Animal‑derived (preformed vitamin A)

• Liver (beef, chicken, fish)
• Egg yolks
• Whole milk, cheese, butter

Plant‑derived (provitamin A carotenoids)

• Carrots, sweet potatoes, pumpkin, yellow squash
• Spinach, kale, collard greens, turnip greens, broccoli
• Apricots, peaches, papaya, cantaloupe
• Asparagus, plantains

Many people take supplemental Vitamin A. Over‑the‑counter options can come in softgels, capsules, or liquid drops.  When selecting a product, look for brands that provide clear dosing, third‑party testing, and forms your body can absorb well.

Common OTC Vitamin A Supplements:

• Swanson Beta‑Carotene 25,000 IU Softgels
• Why Not Natural Vitamin A Drops (Retinyl Palmitate)
• NOW Foods Vitamin A 25,000 IU Softgels
• Genestra Vitamin A Softgels
• Douglas Labs Vitamin A Capsules

🌟 Benefits of Vitamin A (with brief explanations)

• Bone health — supports bone formation and remodeling.
• Cellular protection — acts as an antioxidant that helps protect cells from oxidative stress.
• Cold and flu support — supports the integrity of mucosal barriers.
• Dental health — assists in the development of teeth and oral tissues.
• Eye health — essential for normal vision, especially in low-light conditions.  
• Gastric health — supports normal maintenance of the stomach lining.  
• Heart health — may help regulate cholesterol levels.
• Immune support — contributes to normal immune system function.
• Skin health — supports normal skin cell turnover.

⚠️ Signs of Vitamin A Deficiency

• Dry hair, skin, or eyes
• Fatigue
• Frequent colds
• Insomnia
• Night blindness
• Reproductive difficulties
• Unexplained weight loss

📏 Recommended Daily Intake (RDI)

These values reflect general guidelines for total intake from food and supplements:

• Adult men: ~900 mcg/day
• Adult women: ~700 mcg/day
• Pregnancy: ~770 mcg/day
• Breastfeeding: ~1,200–1,300 mcg/day
• Children: 300–600 mcg/day depending on age

Upper Limit (UL):

• Adults should not exceed 3,000 mcg/day unless directed by a healthcare provider.
• Toxicity risk increases significantly above 30,000 mcg/day.

🚨 Vitamin A Toxicity and Cautions

Taking large amounts of vitamin A—especially preformed vitamin A—can be toxic. Symptoms may include:

• Abdominal pain
• Amenorrhea
• Liver enlargement
• GI disturbances
• Hair loss or itching
• Joint pain
• Nausea or vomiting

Pregnancy warning: Excessive vitamin A has been linked to congenital disabilities such as cleft palate and heart defects. Pregnant individuals should not exceed 3,000 mcg/day and should consult their healthcare provider before supplementing.

Additional cautions:

• Excess intake may increase osteoporosis risk.
• Individuals with liver disease, diabetes, or hypothyroidism should consult a healthcare provider before supplementing.
• Children should not take extra vitamin A unless prescribed.

🩺 Final Thoughts

Dietary supplements can support a healthy lifestyle, but should be used wisely. Always consult a healthcare professional before adding vitamin A or any supplement to your routine. Consumer safety is always a priority.