What Are The Side Effects Of Vitamin A?

The basic concept of Vitamin A

Vitamin A is a Vitamin found in fruits, vegetables, eggs, whole milk, cream, margarine, meat, and deep-sea fish oil, and can also be synthesized in the laboratory. Do you know what are the side effects of Vitamin A?

Vitamin A can be used to treat Vitamin A deficiency and to reduce the complications of certain disease, such as malaria, HIV, measles, and diarrhea in children with Vitamin A deficiency.

Vitamin A can also be used to treat severe menstrual symptoms, premenstrual syndrome, vaginal infections, yeast infections, breast lumps, and to prevent breast cancer.

Some women with HIV use Vitamin A to reduce the risk of the virus being transferred to the baby during pregnancy, childbirth, and breastfeeding. Men can use Vitamin A to increase the number of sperm.

Some people use Vitamin A to improve vision and treat eye problems, including macular degeneration, glaucoma, and cataracts.

Vitamin A can be used to treat acne, eczema, psoriasis, cold sores, injuries, scalds, sunburns, keratosis of hair follicles (also known as Darie’s disease), ichthyosis, and pityriasis pores, Gastrointestinal ulcers, Crohn’s disease, gum disease, diabetes (Diabetes), Haller’s disease (or mucopolysaccharidosis type 1), sinus infection, hay fever (Hay Fever), urinary tract infection, bacillary dysentery, Nervous system diseases, nasal infections, loss of smell, asthma, persistent headache, kidney stones, hyperthyroidism, iron deficiency anemia, deafness, tinnitus, cancerous aphthous ulcers.

Other uses of Vitamin A include preventing and treating cancer, protecting the heart and cardiovascular system, slowing down aging, and strengthening the immune system.

It can also be used on the skin to improve wound healing, reduce wrinkles, and protect the skin from ultraviolet radiation.

The principle of Vitamin A

There is currently not enough research to show the efficacy of Vitamin A.

If you need further information, please discuss it with your doctor or herbalist.

However, it is now known that the eyes, skin, immune system, and other parts of the body need Vitamin A to maintain proper development and Features.


If you encounter the following conditions, please consult a physician, pharmacist, or herbalist to determine whether Vitamin A is suitable for use:

  1. During pregnancy or breastfeeding.
  2. Are taking other medicines.
  3. Allergy to Vitamin A ingredients, other medicines, or other herbs.
  4. Suffering from other diseases, illnesses, or physical conditions.
  5. There are other allergic symptoms, such as allergies to food, dyes, preservatives, or animals.

Compared with the regulation of medicines, the regulation of herbal medicines is less strict, and more research is needed to prove its safety.

Before use, please make sure that the benefits outweigh the risks. It is recommended to consult an herbalist or physician for more information.

Is it safe to use Vitamin A

Daily oral or intramuscular injection of fewer than 10,000 units of Vitamin A is safe for most people. Oral overdose of Vitamin A may not be safe.

Some studies have shown that high doses of Vitamin A may increase the risk of osteoporosis and hip fractures, especially in the elderly.

Adults who consume low-fat dairy products fortified with Vitamin A and many fruits and vegetables usually do not need to supplement Vitamin A or use multiVitamins containing Vitamin A.

Generally speaking, it is safe for children to use the recommended amount of Vitamin A. The maximum use of Vitamin A for children varies according to age:

  • Before the age of 3, less than 2000 units per day.
  • Children aged 4-8 years are below 3000 units per day.
  • Children 9-13 years old are below 5700 units per day.
  • Children aged 14 to 18 are below 9300 units per day.

Special considerations

Pregnancy and breastfeeding: When using more than 10.000 units of Vitamin A per day, it may not be safe for pregnant or breastfeeding women.

Because Vitamin A can cause birth defects, it is necessary to pay close attention to the intake of Vitamin A from various sources during the first three months of pregnancy, which is particularly important for pregnant women.

Vitamin A is present in several different ingredients, including animal products, especially liver, nutritionally fortified breakfast cereals, and dairy products.

Excessive drinking: Drinking alcohol may increase the risk of Vitamin A causing potential liver damage.

If you have a disease that the body cannot properly absorb fat, you should use water-soluble Vitamin A: for example celiac disease, short bowel syndrome, jaundice, cystic fibrosis, pancreatic disease, and cirrhosis.

  • Do not use Vitamin A for high-cholesterol diseases of Type V Hyperlipoproteinemia, because this symptom will increase the chance of Vitamin A poisoning.
  • Intestinal infections: Intestinal infections such as Hookworm can reduce the body’s ability to absorb Vitamin A.
  • Liver disease: Too much Vitamin A will make liver disease worse. Do not use Vitamin A if you have liver disease.
  • Malnutrition: People with severe protein malnutrition use Vitamin A, which may cause too much Vitamin A to stay in the body.
  • Zinc Deficiency: Zinc deficiency may cause symptoms of Vitamin A deficiency, and it may be necessary to take nutritional supplements that combine Vitamin A and zinc to improve this condition.

What are the side effects of Vitamin A?

Long-term use of Vitamin A may cause serious side effects, including fatigue, irritability, mood changes, anorexia, stomach upset, nausea, vomiting, mild fever, excessive sweating, and other side effects.

For women who have passed menopause, excessive use of Vitamin A may increase the risk of osteoporosis and hip fractures.

For children, possible side effects of using Vitamin A in excess of the recommended dosage include irritability, drowsiness, vomiting, diarrhea, loss of consciousness, headache, vision problems, skin peeling, increased risk of pneumonia and diarrhea, and other problems.

There are more and more people worrying that excessive use of antioxidant supplements including Vitamin A actually do more harm than good.

Some studies have shown that excessive use of Vitamin A may increase the mortality of various causes and other serious side effects.

Not everyone will experience these side effects, and some side effects may not be listed. If you have any concerns about side effects, please consult your physician.

Potential interactions with Vitamin A

Vitamin A may interact with the medication or physical condition you are taking. Please discuss with your physician or herbalist before use.

Products that interact with Vitamin A include:

Drugs to treat skin conditions, such as Retinoids

Some medicines for skin treatment have the effect of Vitamin A. When taking Vitamin A and such drugs for treating skin conditions, Vitamin A may cause excessive effects and cause side effects.


Vitamin A interacts with certain antibiotics, and taking large amounts of Vitamin A and certain antibiotics at the same time increases the chance of a serious side effect called intracranial hypertension.

However, using normal doses of Vitamin A and tetracycline at the same time does not seem to cause such problems.

Do not use large amounts of Vitamin A when using antibiotics, for example, minocycline and Achromycin, etc.

Hepatotoxic drugs

The use of large amounts of Vitamin A may damage the liver, and the use of large amounts of Vitamin A and drugs that damage the liver may increase the risk of liver damage.

Do not use Vitamin A in large amounts if you are taking medicines that can damage the liver.

For example amiodarone, carbamazepine, isotonic acid amide tablets, cancer-killing tablets, methyldopa, fluconazole, itraconazole, erythromycin, phenytoin, lovastatin, Pravastatin, simvastatin, and many other drugs.


Generally, warfarin can slow down thrombosis. Large amounts of Vitamin A may also slow down thrombosis. At the same time, the use of large amounts of Vitamin A and warfarin may increase the chance of blood stasis and bleed, so it may be necessary to change the dosage of warfarin.

Recommended dosage of Vitamin A

The following information is not a medical diagnosis, please consult a physician or herbalist before using.

Recommended daily intake of Vitamin A


  • From birth to 6 months: 400 mcg/day (1300 units)
  • 7 ~ 12 months: 500 mcg/day (1700 units)

Children and adults:

  • Children 1~3 years old: 300 mcg/day (1000 units)
  • Children 4-8 years old: 400 mcg/day (300 units)
  • Children 9-13 years old: 600 mcg/day (2000 units)
  • Men over 14 years old: 900 mcg/day (3000 units)
  • Women over 14 years old: 700 mcg/day (2300 units)
  • Pregnant women aged 14-18: 750 mcg/day (2500 units)
  • Pregnant women over 19 years old: 770 mcg/day (2600 units)
  • Breastfeeding women between 14 and 18 years old: 1200 mcg/day (4000 units)
  • Adults over 19 years old: 1300 mcg/day (4300 units)

The maximum intake of Vitamin A:

The maximum intake refers to the maximum amount that will not cause any risk of harmful effects.

  • The upper limit of Vitamin A intake generally refers to retinol (also known as Vitamin A1), which does not contain the precursor Vitamin A or carotene.
  • Infants from birth to 3 years: 600 mcg/day (2000 units)
  • Children 4-8 years old: 900 mcg/day (3000 units)
  • Children 9 to 13 years old: 1700 mcg/day (6000 units)
  • Adolescents 14 to 18 years old (including pregnant and breastfeeding): 2800 mcg/day (9000 units)
  • Adults over 19 years old (including pregnancy and breastfeeding): 3000 mcg/day (10,000 units)

Eating five servings of fruits and vegetables daily can provide approximately 50% to 65% of the recommended Vitamin A intake for adults.

The amount of Vitamin A varies from person to person, mainly affected by age, health, and other diseases; and this type of herbal supplement is not necessarily safe.

Therefore, please consult your physician or herbalist to know the dosage suitable for you before taking it.

Where can I best the most reliable Vitamin A supplements?

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Vitamin A

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