Care should always be taken to use only recommended amounts of supplements. Vitamin A is used by the body to promote vision, the immune system response, and normal organ function when consumed in moderate amounts. It is a fat-soluble vitamin found in high concentrations in animal liver, kidney, and fish oil, and in moderate concentrations in dairy and eggs.
Vegetables such as sweet potatoes and carrots are also moderate sources of vitamin A. Animal-based foods contain preformed vitamin A that readily becomes usable by the body through digestion, while plant-based foods often contain carotenoids, often called provitamin A, which can be made into vitamin A in the liver.
The amount of vitamin A in a food or supplement is indicated by retinol activity equivalents RAE , a measure of how readily the various provitamin A compounds, such as beta-carotene, become vitamin A used by the body. It may also be listed in international units IU , but Food and Drug Administration regulations require new product labels to list amounts in micrograms mcg RAE.
The recommended vitamin A from animal sources and retinoid-based supplements per day varies for different people:. Keeping daily vitamin A intake near the recommended amounts is the safest choice since chronically taking more can be harmful.
Vitamin A toxicity commonly affects the skin, causing reddening, irritation, and patchy peeling. Chronic, excessive supplement use may lead to more severe symptoms, including:.
These severe symptoms correspond to lasting effects on bone health and possible liver damage. A unique symptom of excess beta-carotene consumption, called carotenodermia, causes a yellow or orange coloration of the skin, but this condition is not dangerous. Excessive consumption of animal food sources, like liver or fish oil, in addition to supplements high in preformed vitamin A, increases the risk of vitamin A toxicity.
Many multivitamins contain both preformed vitamin A and provitamin A, so it is important to identify what kinds are present in these supplements. Plant-derived beta-carotene, a provitamin A found in carrots, is metabolized differently than preformed vitamin A. It is not found to be responsible for any of the serious symptoms of vitamin A toxicity.
Some medications will affect how the body absorbs vitamin A. Orlistat, a common weight loss medication, decreases the absorption of fat-soluble vitamins including vitamin A. Patients taking orlistat should also take individual liposomal forms of fat-soluble vitamins A, D, E, K to replenish what the medication strips from the body. Medications called retinoids consist of vitamin A related compounds and are used for treating ailments affecting the skin, blood, and organ lining.
These may increase the risk of toxicity when taken together with vitamin A supplements. If you're diagnosed with chronic vitamin A toxicity based on a blood test, the most important course of action is to reduce vitamin A intake.
In cases of a large toxic dose, you should take activated charcoal. In case of a vitamin overdose, poison control should always be contacted as soon as possible at Most of the B vitamins are important for metabolism.
It's linked to skin, hair, brain, and muscle health. Fortunately, with the exception of vitamins B3 and B6, you most likely will not experience significant vitamin toxicity with their overuse.
Vitamin B1, also known as thiamin, is found in beef, pork, whole grains, legumes, nuts, and sunflower seeds. The recommended daily amount for adults is 1. Vitamin B1 is not known to be toxic in high doses. Vitamin B2, also known as riboflavin, is found in dairy, eggs, meat, salmon, whole grains, and leafy green vegetables.
Vitamin B2 has not been shown to be toxic in high doses. Vitamin B3, also known as niacin , is found in meat, fish, whole grains, and leafy greens. The recommended daily amount for adults is 16 mg for men and 14 mg for women.
Vitamin B3 is used therapeutically to manage cholesterol. However, people taking it may be at risk of toxicity when taking doses of 50 milligrams mg per day or more for a prolonged period of time.
Make sure to check your cholesterol levels after 30—60 days of a niacin B3 protocol. If you're pregnant, avoid taking too much vitamin B3 since it can cause birth defects. High onetime doses of vitamin B3 are not known to be toxic. However, B3should not be taken if you have gout as it can increase uric acid levels. Vitamin C is generally safe, but in large doses anything over 2,mg , it can cause diarrhea and nausea. High doses can also result in falsely elevated blood glucose readings , which can be problematic for diabetics.
Low blood glucose can cause them to feel shaky, sweaty and can even lead to seizure or a loss of consciousness. Oral zinc can also cause gastrointestinal problems and a host of other problems if taken long-term, especially in high doses anything over 40mg.
High levels of zinc can cause a copper deficiency, taste disturbances, hematologic and neurological effects and may interact with some medications and antibiotics. You may actually be deficient in something else completely. Schedule an appointment with your primary care doctor to assess your overall health and if you may be lacking in certain vitamins. Your doctor may recommend certain over-the-counter supplements or suggest simple diet adjustments that can help get you back on track.
To find a Banner Health specialist near you, contact bannerhealth. The correct amount of vitamin A is crucial for the development of a fetus. Your doctor will start by asking you about your symptoms and medical history. The most effective way to treat this condition is to stop taking high-dose vitamin A supplements. Most people make a full recovery within a few weeks.
Any complications that occurred from the excess vitamin A, such as kidney or liver damage, will be treated independently. Recovery depends on the severity of the vitamin A toxicity and how quickly it was treated.
Most people make a full recovery once they stop taking vitamin A supplements. For those who develop complications, such as kidney or liver damage, their outlook will depend on the severity of the damage. This is a detailed review of vitamin D toxicity and how much vitamin D is considered too much. Toxicity is rare, but can occur with extremely high…. Vitamin D is very important for your health, but it is possible to get too much of it. This article explores 6 side effects of taking too much vitamin….
There are four fat-soluble vitamins in the human diet: A, D, E and K. This guide examines their health benefits, functions and main dietary sources. When it comes to nutrition, more is not always better. Here are 8 foods that are incredibly healthy, but can cause severe harm if eaten in excess.
Vitamin overdose occurs when a person ingests far more than the daily recommendation, for an extended period of time. Although the body can excrete excessive amounts of water-soluble vitamins such as vitamin C, it can retain fat-soluble vitamins such as vitamin A, which can be toxic. Here are a few vitamins that are proven to be toxic if taken in excess, as well as their symptoms of overdose:.
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