Because vitamins are not components of human tissues, they can't provide energy. Too much intake is bad for the human body, and some will have toxic side effects and even death.
Such as fat-soluble vitamins, commonly used vitamins A, D and E, etc. Fat-soluble vitamins need bile to help absorption after oral administration, and excessive intake will lead to poisoning. In particular, long-term overdose of vitamin A can lead to serious poisoning and even death. It has also been reported that pregnant women taking a large amount of vitamin A has potential teratogenic effect; Excessive use of vitamin D will lead to hypercalcemia, urinary calculi and soft tissue calcification. If you feed your child a lot of vitamin D fortified food, it will calcify the baby's skull and the front of the commissure line, leaving no room for brain development, thus affecting intellectual development and not easy to recover; Taking a large amount of vitamin E for a long time will lead to gastrointestinal dysfunction, angular stomatitis, dizziness, blurred vision and so on. Women can cause menorrhagia or amenorrhea.
Water-soluble vitamins, such as vitamin C and vitamin B 1, are commonly used. Water-soluble vitamins are easily absorbed in the intestine after oral administration, and there is no certain storage in the body. If you take too much, it will be discharged from the urethra through the kidney, and generally there will be no toxic side effects. However, there are also reports of urinary calculi caused by oral high-dose vitamin C. Intravenous high-dose vitamin C can cause thrombosis or intravascular hemolysis. Anaphylactic shock can occur after intramuscular injection of vitamin B 1. Large doses of vitamin B6 can cause headache, abdominal pain and rash after intravenous injection.
To sum up, it is inappropriate to use vitamins as "tonics" at will. The indications should be strictly controlled and used rationally to prevent abuse, waste and damage to human body.
Taking too many vitamins is harmful to health.
We know that lack of vitamins will damage health and lead to serious diseases. However, do you know that taking too many vitamins and trace elements will also seriously damage our health! Let's talk about the harm of taking too many vitamins:
Vitamin A A A large amount of vitamin A will reduce the blood flow of healthy people's brains, causing headaches, brain swelling and even death. Too much vitamin A can also damage the joints of arms and legs.
Excessive use of B vitamins can also cause many problems, such as: too much vitamin B6 can make people neurotoxic.
Too much vitamin C can cause stomach pain and intestinal dysfunction. At the same time, taking a large amount of vitamin C will also affect the production of red blood cells, making people weak and tired. In addition, cancer patients who are receiving radiotherapy or chemotherapy should not take it. Excessive intake of vitamin D (adults > > 20000IU, children > 1 800 IU) may cause excessive vitamin D, which is manifested as thirst, eye inflammation, itchy skin, vomiting, diarrhea, frequent urination and abnormal precipitation in human hollow organs.
Excessive use of vitamin E will cause platelet aggregation and thrombosis, and if combined with estrogen, it will also cause thrombophlebitis.
In addition, taking a lot of vitamins will also affect the effect of taking other drugs, and once taking vitamins will be addictive, suddenly stopping taking them will cause physical discomfort. Moreover, scientists believe that if you can get enough nutrition from enough food, you don't need to take any vitamin drugs at all.
Therefore, if you want to live a long and healthy life, you must first improve your immune function. Therefore, it is particularly important to adhere to proper physical exercise, reasonable diet and regular life! People who really need vitamins and trace elements, please ask a doctor for guidance, symptomatic and safe.
Pregnant women should take vitamins carefully.
Doctors say that many pregnant women take multivitamins, but they don't know that although vitamins are a health care drug, excessive vitamins can also have side effects on the fetus. For example, taking a large amount of vitamin C for a long time will lead to abortion, taking a large amount of vitamin A may lead to skeletal malformation, defects in the genitourinary system and hard cleft palate in infants, taking too much vitamin E will lead to abnormal development of fetal brain, and taking too much vitamin D will lead to problems in the development of fetal arteries and teeth.
Vitamins should be taken after meals
In people's minds, vitamin drugs are "supplements" and "substitutes" of vegetables and fruits, with little side effects and great safety. Therefore, many people eat vitamin drugs just like vegetables and fruits, which is very casual, sometimes before meals and sometimes after meals. Most doctors don't explicitly tell patients whether vitamins should be taken before or after meals. However, most manufacturers of vitamin drugs only indicate the usage and dosage on the bottle label, but do not indicate the precautions.
Importantly, it is not explained whether to take it before or after meals.
In fact, taking vitamin drugs, like using other drugs, also has certain regulations, requirements and precautions, that is, taking after meals. Because vitamins are mainly absorbed by the small intestine after oral administration, if taken before meals, drugs will be absorbed into the blood quickly when taken on an empty stomach because there is no food in the gastrointestinal tract, resulting in an increase in the concentration of vitamins in the blood, which will be excreted through the kidneys and urethra before being used by the human body, thus significantly reducing the efficacy.
For example, the utilization rate of vitamins B 1, B2 and B6 decreased after fasting, while the absorption rate after meals was stable, and the absorption rate increased linearly with the increase of dose. This is because the stomach contents are slowly discharged after eating, so that the drugs are slowly transported to the upper part of the small intestine to avoid saturation of the absorption mechanism.
Coenzymes vitamin B 12 and vitamin C are more beneficial to absorption after meals, but they cannot be taken at the same time. If taken at the same time, the bioavailability of B 12 will be reduced and the efficacy will be greatly reduced. In order to avoid the deficiency of B 12, it should be taken at intervals of 2 ~ 3 hours.
Similarly, oral vitamin D2 should be taken after meals, and it is best to eat some oily foods (such as fried dough sticks and pork) first to facilitate the dissolution and absorption of drugs. If it is used to treat infantile tetany, calcium should be supplemented first.
Vitamin AD (cod liver oil pill), vitamin E and vitamin PP (nicotinic acid, nicotinic acid) should also be taken after meals. AD pills are suitable for taking after meals 15 minutes, and eating oily food helps absorption. Because the side effects of vitamin PP are skin flushing, itching, burning pain, and even palpitations, urticaria, nausea, vomiting and so on. Taking it after meals can obviously reduce the side effects. In order to avoid long-term high-dose stimulation of gastrointestinal tract, it should be taken after meals.
At present, all kinds of vitamin products are overwhelming in the market, but experts remind that excessive vitamin intake can not only ensure the balance of nutrition, but also bring unexpected dangers.
Many people mistakenly believe that the more vitamins the better, so they take vitamin drugs for a long time. As we all know, extremes meet, taking large doses of vitamins will not only cause waste, but also cause various adverse reactions when the human body is not short of vitamins.
Excessive Vc is harmful to health.
Vitamin C is one of the most common vitamins and is considered to be the least toxic. Some people take vitamin C to enhance their resistance when they have a cold, but if it exceeds 1g/ time, a large dose of vitamin C not only enhances the immune mechanism of the body, but also provides nutrition for the growth of the virus, which is not worth the loss. Taking vitamin C4 12g orally every day can precipitate urate in urethra to form stones. Taking vitamin C 1g or more orally every day can make the skin red, increase intestinal peristalsis, and cause abdominal cramps and diarrhea. Daily dosage of more than 0.6 grams will lead to frequent urination. If children take large doses of vitamin C for a long time, it may affect bone development. In addition, taking a large dose of vitamin C will also reduce the fertility of some women, and affect the development of the fetus, and even lead to congenital scurvy.
Once people who take large doses of vitamin C for a long time stop taking it, they still maintain high decomposition rate and high excretion rate of vitamin C in their bodies, so that when the content of vitamin C in food is sufficient, symptoms of vitamin C deficiency will appear.
Va overdose and severe poisoning
Vitamin A plays an important role in bone growth and maintaining gonadal function, but excessive intake can also lead to poisoning. Acute poisoning is characterized by dizziness, lethargy, headache, vomiting, diarrhea and other symptoms. Chronic poisoning is characterized by bone and joint pain, swelling, itchy skin, fatigue, weakness of limbs, irritability, abdominal pain and oligomenorrhea in women.
Continuous service blurs vision.
Vitamin E is an antioxidant, which is considered to have the functions of preventing cardiovascular and cerebrovascular diseases and anti-aging, and is widely used. But what if you take it for a long time? A daily dose of 400 mg to 800 mg can cause blurred vision, mammary gland enlargement, flu-like syndrome, headache, dizziness, nausea and stomach cramps. Taking more than 800 mg daily for a long time will change endocrine metabolism and immune response, reduce sexual function, and may lead to thrombophlebitis or embolism.
Excessive Vd growth stagnation
Vitamin D is indispensable for the metabolism of "calcium" in the body and is very effective in preventing and treating rickets in children. However, taking too much or too much in a short time can also lead to serious toxic reactions. There are significant individual differences in poisoning dose. Some children suffer from growth stagnation after taking vitamin D 1800 units for a long time.
Vb6 excessive drug dependence
Vitamin B is a very important water-soluble vitamin. It has been reported that taking vitamin B6200 every day will lead to drug dependence, and taking 2-6g every day for several months may lead to unstable gait, numbness and inflexibility of hands and feet.
It should be pointed out that the above-mentioned vitamin poisoning usually occurs only in the case of long-term overdose. For most people, the dose that can cause poisoning is obviously greater than the usual therapeutic dose. If you need extra vitamins, you can take the medicine safely under the guidance of a doctor without being too nervous. Children, pregnant women, the elderly, patients with chronic diseases, patients with renal insufficiency, and people with special physique may have toxic reactions if they take drugs solely for health care, or take vitamins for a long time without the guidance of doctors, if the vitamin dose is not too large. (Feng Tao)