Vitamin A has long been celebrated for its role in vision, immunity, and skin health — but a sharp rise in supplement-related toxicity is reframing the conversation. Reports of vitamin A overdose climbed roughly 38% in 2025, according to recent surveillance data highlighted by Medical News Today, fueled in part by the booming popularity of high-dose multivitamins, beauty supplements, and cod liver oil. Because vitamin A is fat-soluble, it accumulates in the liver rather than being flushed out in urine, which means even small daily excesses can compound into real harm over months.
Here is what current research suggests about safe intake, the difference between plant and animal sources, and the warning signs that you may be getting too much.
Why Vitamin A Matters
Vitamin A is a group of fat-soluble retinoids — including retinol, retinal, and retinyl esters — plus provitamin A carotenoids such as beta-carotene. According to the National Institutes of Health (NIH) Office of Dietary Supplements, the nutrient is essential for:
- Maintaining healthy vision, especially in low light
- Supporting immune cell development and function
- Regulating cell growth, reproduction, and embryonic development
- Keeping skin, lungs, and the gut lining healthy
Animal foods such as liver, eggs, and dairy supply preformed vitamin A (retinol), which the body can use directly. Plant foods like carrots, sweet potatoes, spinach, and kale supply carotenoids, which the body converts to vitamin A as needed — a self-regulating process that makes plant sources far safer for long-term intake.
How Much Is Safe?
The NIH sets the Recommended Dietary Allowance (RDA) for adults at 900 micrograms (mcg) of retinol activity equivalents (RAE) per day for men and 700 mcg RAE for women. The Tolerable Upper Intake Level (UL) — the maximum daily amount unlikely to cause harm — is 3,000 mcg RAE for adults.
It is easy to exceed that ceiling without realizing it. A single serving of beef liver can deliver more than 6,000 mcg of preformed vitamin A. A high-dose multivitamin may add another 1,500 mcg. Stack that with a cod liver oil capsule and a “skin and hair” supplement, and a daily intake of 10,000 mcg or more becomes plausible.
Who Is Most at Risk
Research published in journals such as the American Journal of Clinical Nutrition and Hepatology identifies several groups at elevated risk of toxicity:
- Pregnant individuals — high retinol intake is linked to birth defects; the UL during pregnancy remains 3,000 mcg RAE
- People with liver disease — the liver stores excess vitamin A, and damaged tissue tolerates less
- Heavy supplement users — particularly those combining a multivitamin with cod liver oil or “beauty” formulas
- Long-term users of isotretinoin or other retinoid medications, where overlap with supplements can amplify levels
Signs of Vitamin A Toxicity
Toxicity, also called hypervitaminosis A, comes in two forms. Acute toxicity follows a single very large dose and causes nausea, headache, blurred vision, and skin peeling within hours to days. Chronic toxicity develops over months or years of moderately excessive intake and is more common with supplements.
According to the Cleveland Clinic and reviews in The Lancet, chronic symptoms can include:
- Persistent headaches and dizziness
- Dry, itchy, or peeling skin and cracked lips
- Hair loss and brittle nails
- Bone and joint pain — and, over time, reduced bone density
- Liver enlargement, elevated liver enzymes, or jaundice
- Mood changes, irritability, or fatigue
Carotenoids from plant foods do not cause classical vitamin A toxicity because the conversion to retinol is regulated. They can, however, cause a harmless yellow-orange tint to the skin (carotenodermia) with very high carrot or sweet potato intake — a cosmetic effect, not a medical one.
Why Cases Are Rising in 2026
The recent jump in poison-center calls reflects several converging trends. Cod liver oil has been re-popularized on social media for everything from immunity to ADHD, and many products are dosed well above the RDA. “Hair, skin, and nails” gummies routinely contain 100–300% of the daily value for retinol. And the wellness market increasingly stacks multiple products — a multivitamin, a beauty blend, a prenatal, an immune booster — without accounting for overlap.
Surveillance studies suggest most cases are mild and reversible once the source is stopped, but a meaningful subset involve hospital visits for liver injury, intracranial pressure, or — in pregnancy — concerns about fetal development.
Smart Ways to Get Enough Without Overdoing It
For most healthy adults, food alone supplies more than enough vitamin A. Research summarized by the Harvard T.H. Chan School of Public Health indicates that a diet rich in colorful vegetables and the occasional egg or dairy serving comfortably meets the RDA. Practical steps include:
- Build meals around carotenoid-rich produce: carrots, sweet potatoes, butternut squash, spinach, kale, red bell peppers, and mango
- Pair them with a source of healthy fat — olive oil, avocado, nuts — to improve absorption
- Limit liver and liver-based products to occasional servings rather than weekly staples
- Read supplement labels for “retinol,” “retinyl palmitate,” or “retinyl acetate” and tally totals across every product you take
- Prefer beta-carotene over preformed retinol in supplements when supplementation is needed
- If pregnant or planning pregnancy, review every supplement with a healthcare provider
The Bottom Line
Vitamin A is a clear example of a nutrient where more is not better. The same fat-soluble property that lets the body store it for steady use also makes it easy to accumulate to harmful levels when supplements stack up. Studies indicate that the safest, most sustainable path for most people is a vegetable-forward diet, with supplementation reserved for documented deficiency or specific clinical guidance.
If you regularly take a multivitamin, fish liver oil, or a beauty supplement, consider auditing your labels this week and discussing total intake with your healthcare provider — especially if you have noticed dry skin, headaches, or unexplained fatigue.
Disclosure: This content is for informational purposes only and is not medical advice. Always consult a qualified healthcare provider before making changes to your health regimen.