Although vitamins are essential nutrients for the body, we must grasp the degree. In recent years, in order to pursue health, people have used a lot of vitamin supplements. Instead of health care, they will die, and even various diseases will follow, such as uremia and cirrhosis.

Which vitamins will cause harm if you take too much?

1, vitamin B3

Vitamin B3 can maintain normal energy metabolism and ensure the health of skin, digestive tract and nerves, but excessive intake will release a lot of histamine and cause vasodilation. Especially in patients with duodenal ulcer and asthma, excessive vitamin B3 supplementation can easily cause skin redness, swelling, heat and itching. At the same time, it will compete with uric acid for excretion, so that uric acid can not be excreted normally, leading to hyperuricemia. The daily intake of vitamin B3 for adults should be controlled at 13~ 19 mg, which can be obtained from milk eggs, fish, nuts and green leafy vegetables.

2, vitamin B9

Vitamin B9, also known as folic acid, is the main nutrient for constructing DNA, which can prevent anemia and reduce fatigue. Natural fruits and vegetables contain vitamin B9, but natural vitamin B9 is unstable. Fruits that are too ripe or overcooked will accelerate the loss of vitamin B9. The elderly, children and pregnant women can use vitamin B9 supplements appropriately. But the daily intake should be controlled at 400 mg. If you eat too much, it will reduce your attention, increase your physical fatigue, weaken your cell activity, affect your zinc metabolism, and make your fetus develop slowly. Studies have found that excessive vitamin B9 supplementation in pregnant women will increase the risk of autism in children.

3. vitamin a

Vitamin A can maintain normal vision, and also help skin epithelial tissue and bone growth. Taking too much vitamin A in a short time can cause acute poisoning, and the main symptoms are nausea and vomiting, blurred vision, dizziness and muscle disharmony. If the daily intake of vitamin A exceeds 30,000 micrograms, it can cause chronic poisoning, mainly manifested as muscle weakness, osteoporosis and bone pain, as well as abnormal skin, drowsiness and hair loss. The intake of vitamin A for men should be controlled at 600 micrograms, and that for women should not exceed 500 micrograms. Vitamin A can be obtained from meat and fish, dairy products and animal liver.

4, vitamin B6

Vitamin B6 can affect the function of the central nervous system. Adults can supplement 60~80 mg every day. If it exceeds 2000 mg, it may lead to progressive sensory disturbance and even irreversible damage to vibration sensation.

5, vitamin C.

In the eyes of many people, vitamin C is omnipotent. It can really enhance resistance, achieve the effect of beauty beauty, and accelerate skin repair. Vitamin C is water-soluble and easy to excrete, so many people will blindly supplement vitamin C. However, after vitamin C is metabolized, oxalic acid can be generated. If vitamin C exceeds 4,000 mg every day and there is not enough water, oxalic acid will combine with calcium to produce calcium oxalate, which will increase the chance of getting stones. In addition, vitamin C is an acidic substance. Taking a large amount will also stimulate the gastric mucosa, which is easy to cause diarrhea. Therefore, the daily intake of vitamin C in adults should be controlled within 100 mg.

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In addition to the above vitamins, it is also necessary to control the intake of vitamin D and vitamin E. Supplementing too much vitamin D will slowly deposit in organs such as liver, kidney, heart and lung, and even cause uremia. Supplementing too much vitamin E will interfere with the natural antioxidants in the body, and it can't prevent cardiovascular diseases at all.