什么是B7分子_百度知道

The body needs enough biotin to perform various metabolic functions, but it can’t produce this vitamin on its own. It’s often recommended for maintaining healthy skin and nails, and improving your metabolism due to its impact on enzymes. Biotin — or vitamin B7 — is one of the eight essential B vitamins that support various aspects of our overall health. WebMD does not provide medical advice, diagnosis or treatment. Never delay or disregard seeking professional medical advice from your doctor or other qualified health care provider because of something you have read on WebMD. Barbesino G. Misdiagnosis of Graves’ disease with apparent severe hyperthyroidism in a patient taking biotin megadoses.

Good sources of vitamin B6

In one, the valeric acid sidechain is cleaved, resulting in bisnorbiotin. Once absorbed, sodium-dependent multivitamin transporter (SMVT) mediates biotin uptake into the liver. Consumption of biotin as part of a normal diet results in urinary excretion of biotin and biotin metabolites. For biotin, however, there is no upper limit because the adverse effects of high biotin intake have not been determined. The US National Academy of Medicine estimates upper limits for vitamins and minerals when evidence for a true limit is sufficient.

• Bacteria also synthesize biotin, and it is thought that bacteria resident in the large intestine may synthesize biotin that is absorbed and utilized by the host organism.
• Petrelli, F., Moretti, P., and Paparelli, M. Intracellular distribution of biotin-14COOH in rat liver.
• Taking 200mg or more a day of vitamin B6 can lead to a loss of feeling in the arms and legs known as peripheral neuropathy.
• UV light can destroy riboflavin, so ideally these foods should be kept out of direct sunlight.
• Because it’s a water-soluble vitamin, any excess is excreted through urine.
• However, it’s important to avoid consuming too much organ meat as this can cause vitamin toxicity.

Although biotin deficiency is rare, some groups of people may be more susceptible to it, such as patients suffering from Crohn’s disease. In general, a healthy varied diet provides the body with sufficient amounts of biotin. Biotin exists in a wide variety of foods, which helps explain why a deficiency in the vitamin is fairly rare.

• Metabolic degradation of the biotinylated carboxylases leads to the formation of biocytin.
• Household deprivation was measured against four dimensions for the 2021 census – employment, education, health/disability, and overcrowding.
• Thiamin cannot be stored in the body, so you need it in your diet every day.
• Multiple micronutrient supplementation increases the growth of Mexican infants.
• For more information about building a healthy dietary pattern, see the Dietary Guidelines for Americans and the U.S.
• Discover whether drinking vitamin water is as healthy as it claims and how this drink may affect your overall well-being.
• Miller, S. J. Nutritional deficiency and the skin.

You should be able to get all the vitamin B6 you need from your daily diet. Pantothenic acid cannot be stored in the body, so you need it in your diet every day. Taking 40mg or less a day of riboflavin supplements is unlikely to cause any harm. Taking 100mg or less a day of thiamin supplements is unlikely to cause any harm. No evidence in humans has shown a toxicity of biotin even with high intakes.

Mental Health

Biotin deficiency is very rare in the United States. Biotin helps turn the carbohydrates, fats, and proteins in the food you eat into the energy you need. For more in-depth information, see our health professional fact sheet. Women who cannot get pregnant and men should be able to get all the folate they need by eating a varied and balanced diet.
There is no UL for biotin due to a lack of reports showing negative effects from very high intakes. You may recognize vitamin B7 by its popular name of biotin. Studies report biotin improves the growth of new hoof horn rather than improving the status of existing hoof, so months of supplementation are needed for the hoof wall to be completely replaced. A review of controlled trials reported that supplementation at 20 mg/day increased milk yield by 4.8%. Consequences of lameness include less food consumption, lower milk production, and increased veterinary treatment costs. Further chemical characterization of vitamin H revealed that it was water-soluble and present in high amounts in the liver.
You should be able to get all the pantothenic acid you need from your daily diet, as it’s found in many foods. There’s not enough evidence to know what the effects might be of taking high daily doses of nicotinamide supplements. Taking high doses of nicotinic acid supplements can cause skin flushes.

Pantothenic acid

As a water-soluble vitamin, biotin is not stored in the body, instead being secreted through urine, so it must be provided in our daily diet. Some evidence has shown that those suffering from diabetes may be susceptible to biotin deficiency. Vitamin B7 can aid in caring for thinning hair and brittle nails, especially in those suffering from biotin deficiency.

What are the health benefits of biotin?

Food and Drug Administration (FDA) issued a warning based on reports of biotin supplements interfering with laboratory blood tests, causing incorrect results. Healthcare professionals are advised to instruct patients to stop taking biotin supplements for 48 h or even up to weeks before the test, depending on the specific test, dose, and frequency of biotin uptake. Treatment of partial biotinidase deficiency is also recommended even though some untreated people never manifest symptoms.
However, research so far has shown no conclusive results to back up the claim that biotin is directly related to the improvement of skin and nail condition or in increased hair growth. Although biotin may be present in certain cosmetics, it is important to remember that it cannot actually be absorbed through skin, hair or nails. Biotin deficiency symptoms include hair loss, skin issues including rash, an appearance of cracking in the corners of the mouth, dryness of the eyes and appetite loss. Other foods that contain this vitamin are whole meal bread, salmon, pork, sardines, mushroom and cauliflower..|Some people take supplements that either contain biotin on its own or in a combination of vitamins. However, little research has linked the vitamin with hair health in people who do not have biotin deficiencies. For people with this deficiency, taking supplements that contain biotin could improve the strength of their nails. These foods are also high in other essential B vitamins and nutrients, making them a good nutrient-rich addition to your diet. While evidence is limited, studies have shown that biotin supplements may help improve the strength and durability of your fingernails and hair. Tell your doctor, pharmacist, and other health care providers about any dietary supplements and prescription or over-the-counter medicines you take.}

When isolated, biotin is a white, needle-like crystalline solid. Present in every living cell, it is involved as a cofactor for enzymes in numerous metabolic processes, both in humans and in other organisms, primarily related to the biochemistry of fats, carbohydrates, and amino acids.
Although a deficiency of biotin can certainly lead to hair loss and skin or nail problems, evidence showing a benefit of supplementation is inconclusive. Biotin supplements are often glamorized as a treatment for hair loss and to promote healthy hair, skin, and nails. When people are ingesting high levels of biotin in dietary supplements, a consequence can be clinically significant interference with diagnostic blood tests that use biotin-streptavidin technology. Aside from inadequate dietary intake (rare), biotin deficiency can be caused by a genetic disorder that affects biotin metabolism. Primary biotin deficiency, meaning deficiency due to too little biotin in the diet, is rare because biotin is contained in many foods. Biotin is commonly advised as a dietary supplement for strengthening hair and nails, as well as in skin care.

Signs You’re Low on Vitamin B12

Vitamin B7 is found in a number of foods, though in small amounts. However, people with biotin deficiencies may experience skin problems, including red, scaly rashes. Scientists do not fully understand biotin’s role in maintaining healthy skin. Studies in animals have suggested that supplements containing biotin and chromium picolinate could prevent insulin resistance.
Because egg-derived avidin binds strongly to biotin with a dissociation constant Kd ≈ 10−15 M, biotinylated compounds of interest can be isolated from a sample by exploiting this highly stable interaction. Chemically modified versions of biotin are widely used throughout the biotechnology industry to isolate proteins and https://www.b7.casino/ non-protein compounds for biochemical assays. Biochemical and clinical manifestations of any of these metabolic disorders can include ketolactic acidosis, organic aciduria, hyperammonemia, rash, hypotonia, seizures, developmental delay, alopecia and coma. There can also be a genetic defect affecting the sodium-dependent multivitamin transporter protein.
Hungarian scientist Paul Gyorgy began investigating the factor responsible for egg-white injury in 1933 and in 1939, was successful in identifying what he called “Vitamin H” (the H represents Haar und Haut, German for ‘hair and skin’). Overconsumption of 5 mg/day or higher causes elevated concentration in plasma that interferes with biotin-streptavidin immunoassays in an unpredictable manner. Holocarboxylase synthetase deficiency prevents the body’s cells from using biotin effectively and thus interferes with multiple carboxylase reactions.