Vitamin A, vitamin B3 and vitamin E can cause nausea, bone pain and internal bleeding if taken in large amounts.
A study published on Discover on April 13 found that these three vitamins can be harmful if taken in excess. Many people use vitamins indiscriminately because they think they are health supplements. However, few people understand how they affect the body, according to Elena Goun, a chemistry professor at the University of Missouri and co-author of the study.
According to research, niacin, or vitamin B3, is a popular supplement recommended for people with high cholesterol, arthritis, and impaired brain function. The recommended daily intake of niacin is 16 mg for men, 14 mg for women, and 18 mg for pregnant women.
According to the Harvard TH Chan School of Public Health , niacin was once recommended for people at risk of heart disease. However, a series of studies have found that niacin does not actually reduce the risk of developing heart disease, stroke, or increase longevity.
On the contrary, it has negative effects such as diarrhea and skin rash. Other forms of vitamin B3 such as nicotinamide riboside, often used for anti-aging, have been linked to brain cancer. According to Harvard, taking more than 35 mg of vitamin B3 per day can cause people to experience adverse effects such as itching, skin redness, dizziness, nausea, stomach pain or fatigue.
Vitamin A is a supplement that has been recommended to promote eye health and support the immune system. According to the Food and Drug Administration (FDA), men should take 900 mg of vitamin A per day, and women should take 700 mg per day. If you take more than 3,000 mg per day, you may be poisoned. During the investigation, international media found some dietary supplements containing up to 7,500 mg of vitamin A in one pill.
Illustration of a vitamin supplement. Photo: Pexel
According to the Harvard TH Chan School of Public Health, vitamin A toxicity is more common in the United States, due to high doses of vitamin A (retinol). If you take too much vitamin A, you may experience joint pain, nausea, vomiting, dry skin, blurred vision, and sensitivity to light. In the long term, researchers have also found a link between vitamin A use and the risk of lung cancer, especially for smokers.
Vitamin E is a recommended supplement to boost immunity. It is found in many foods such as peanuts, almonds, mangoes or kiwis. However, the National Institutes of Health (NIH) recommends that adults only get 15 mg of vitamin E per day through diet. If you take more than 1,000 mg of this nutrient, you risk toxicity, symptoms of which include muscle weakness, diarrhea and nausea.
According to pharmaceutical company Merck, vitamin E acts like a blood thinner, so taking vitamin E when injured can easily cause people to bleed more externally or internally than normal.
In rare cases, the NIH reports that vitamin E has led to life-threatening bleeding that can make a stroke worse. Research from Harvard Medical School found that taking vitamin E increased the risk of bleeding by 22%.
In addition to the three particularly dangerous supplements, experts recommend that people be cautious when using multivitamins. According to the NIH, these products contain “significantly higher amounts of vitamins and minerals” than the recommended daily allowance, and can even reach dangerous levels.
Thuc Linh (According to NY Post )
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