TL;DR: Vitamin A and vitamin E supplements are not smart default supplements for most adults. Because they are fat-soluble and stored in your body, excess intake can build up over time, so you should use them only when you have a clear medical reason, a documented deficiency, or direct guidance from your clinician.

If you are thinking about taking either supplement, check your diet, medications, and lab results first. That matters even more now that Rock Health reported that 32% of consumers now use AI chatbots for health information, while the U.S. Department of Education found that only 12% of U.S. adults have proficient health literacy.

Vitamin A supports vision, immune function, and skin health. Vitamin E acts as an antioxidant and helps protect cells. Both are essential nutrients, but essential does not mean you need a high-dose supplement.

Are vitamin A and vitamin E supplements bad for you?

Yes, they can be harmful when you take more than your body needs. The main reason is simple: vitamins A and E are fat-soluble, so your body stores them instead of quickly clearing the excess. That makes high-dose or unnecessary supplementation riskier than many people realize.

For most adults, these are not routine wellness upgrades. If your intake is already adequate from food or a standard multivitamin, adding more increases the chance of side effects without adding meaningful benefit.

• Vitamin A risk: excess can build up in the liver and other tissues

• Vitamin E risk: high doses can increase bleeding risk

• Main rule: more is not better

Why are vitamins A and E riskier than some other supplements?

They are riskier because they stay in your body longer. Fat-soluble vitamins are absorbed with fat and stored in the liver and body fat, so repeated high doses can accumulate over weeks or months instead of being quickly excreted.

That storage effect is the key difference from many water-soluble vitamins, such as vitamin C and several B vitamins. Water-soluble vitamins are not automatically harmless, but vitamins A and E deserve extra caution because your body can hold onto excess amounts.

This matters in real life because many people already manage multiple medications and health tasks. According to the CDC, about two-thirds of Americans are currently taking at least one prescription medication, which increases the chance of overlap, confusion, and supplement interactions.

What are the risks of taking too much vitamin A?

Too much vitamin A can cause toxicity. Short-term symptoms include nausea, headache, dizziness, and blurred vision; longer-term excess can damage the liver, weaken bones, and create serious pregnancy-related risks, including birth defects.

This is why self-prescribing high-dose vitamin A is a bad idea. If you are pregnant, trying to conceive, or taking other medications, you need a clear reason and a specific dose plan before using it.

• Liver stress: vitamin A is stored in the liver

• Bone effects: long-term excess intake can contribute to bone thinning

• Pregnancy risk: high doses can harm fetal development

• Hidden duplication: multivitamins, skin formulas, and immune blends may already contain it

What are the risks of taking too much vitamin E?

High-dose vitamin E supplements can increase harm instead of preventing disease. The biggest concern is bleeding risk, especially if you also take blood thinners or other medications that affect clotting.

Vitamin E supplements also have not earned a role as a routine disease-prevention shortcut for most adults. If you are taking it just in case, that is not a strong reason to continue.

• Bleeding risk: higher doses can interfere with normal clotting

• Medication interaction risk: especially important with anticoagulants and antiplatelet drugs

• No automatic prevention benefit: high-dose use is not a substitute for diet, exercise, or medical care

Do most people actually need vitamin A or vitamin E supplements?

No. Most adults do not need vitamin A or vitamin E supplements unless a clinician has identified a deficiency, a malabsorption problem, or another specific medical reason. In everyday practice, unnecessary use is more common than true deficiency.

That matters because medication routines are already hard to manage. The World Health Organization reports that approximately 50% of patients do not take their medications as prescribed, and the CDC notes that one in five new prescriptions are never filled, and about 50% of filled prescriptions are taken incorrectly.

Adding unnecessary supplements can make your routine more confusing, not healthier.

When should you take vitamin A or vitamin E supplements?

You should take them when you have a clear, documented reason. That usually means a diagnosed deficiency, a condition that affects absorption, or a clinician-directed treatment plan with a defined dose and follow-up timeline.

Good supplement use is targeted. You should know what problem you are treating, how much you need, how long to take it, and when to reassess.

1. Confirm the reason: ask whether you have a documented deficiency or condition that justifies supplementation

2. Review your medications: check for interactions and duplicate ingredients

3. Check the dose: avoid mega-dose products unless specifically prescribed

4. Set a follow-up plan: know when to recheck symptoms, labs, or side effects

Is it better to get vitamins A and E from food?

Yes. For most people, food is the safest and most effective source of vitamins A and E. Foods provide these nutrients in amounts your body is better designed to handle, along with fiber, healthy fats, and other nutrients that pills do not replicate.

If your goal is everyday health, food-first is the smarter strategy.

• Vitamin A foods: carrots, sweet potatoes, spinach, leafy greens, eggs, dairy

• Vitamin E foods: almonds, sunflower seeds, hazelnuts, avocado, vegetable oils

• Food-first benefit: lower risk of accidentally overshooting your intake

How do you know if a supplement is affecting your health?

You track what you take, how you feel, and what your labs show. Do not rely on memory alone. The safest supplement decisions come from seeing your medications, symptoms, and test results together.

This is especially important because record access is now common. The Office of the National Coordinator for Health IT found that 65% of individuals accessed their online medical records or patient portal in 2024, and 81% of individuals with a chronic condition were offered online access to their records, with 69% actually accessing them at least once.

Lab awareness matters because common conditions are often missed. The CDC reports that 88 million Americans have prediabetes, but more than 80% do not know it. The CDC also estimates that more than 1 in 7 U.S. adults, about 35.5 million people, have chronic kidney disease. If you are taking supplements without understanding your underlying health picture, you are guessing.

What should you do before starting a vitamin A or E supplement?

You should use a short checklist before buying anything. This helps you avoid unnecessary supplements, catch duplicate ingredients, and spot situations where a clinician or pharmacist should review your plan first.

Most supplement mistakes happen because people act on marketing, vague symptoms, or incomplete information instead of their actual records and medication list.

• Ask why you want it: is it based on symptoms, a lab result, or advertising?

• Check your current products: multivitamins and specialty blends may already contain vitamins A or E

• Review your prescriptions: this is especially important if you take blood thinners or liver-affecting medications

• Look at your diet first: you may already be getting enough from food

• Get professional guidance: use your clinician, pharmacist, and your records

How can Slothwise help you make safer supplement decisions?

Tools like Slothwise help you organize the information that makes supplement decisions safer. Instead of guessing, you can review your records, medications, labs, and health questions in one place, which makes it easier to decide whether a supplement is necessary or excessive.

Slothwise imports medical records from 60,000+ hospitals and clinics, connects 300+ wearables and health devices, and offers AI-powered health Q&A with cited medical sources, including the source title, URL, and snippet. For more complex questions, it includes advanced research mode.

It also provides lab results interpretation for 200+ markers with clinically sourced, age- and sex-stratified reference ranges. If you are trying to understand whether a deficiency is real, whether a symptom fits your labs, or whether your supplement routine makes sense alongside your medications, that context matters.

For day-to-day tracking, Slothwise includes medication tracking with dose scheduling, status tracking, and push reminders, plus manual tracking for weight, blood pressure, mood, hydration, blood sugar, and free-form text or voice notes. It works on iOS, Android, and by RCS/SMS with no app install needed, which makes it easier to keep your supplement and medication routine consistent.

Bottom line: should you take vitamin A or vitamin E supplements?

For most adults, the answer is no unless you have a specific medical reason. Vitamin A and vitamin E are essential nutrients, but high-dose supplements are not harmless, and they are not routine insurance policies for better health.

Start with food, your medication list, and your lab results. If you still think you need a supplement, use a targeted plan with a clear reason, a defined dose, and follow-up.

Sources

• Rock Health Consumer Survey (2025). Consumer use of AI chatbots for health information.

• U.S. Department of Education, National Assessment of Adult Literacy (2024). Health literacy levels among U.S. adults.

• CDC, National Center for Health Statistics (2024). Prescription medication use in the United States.

• World Health Organization (2024). Medication adherence rates and public health impact.

• CDC Grand Rounds on Medication Adherence (2024). Prescription fill rates, incorrect use, and avoidable costs.

• Office of the National Coordinator for Health IT (2025). Patient portal and online medical record access in 2024.

• Centers for Disease Control and Prevention (2025). National diabetes and prediabetes statistics.

• Centers for Disease Control and Prevention (2025). Chronic kidney disease prevalence in U.S. adults.