How many vitamin b complex a day

One case of phenelzine-induced vitamin B6 deficiency has been reported. Little is known about this interaction. People taking phenelzine should ask their doctor about monitoring vitamin B6 levels and considering supplementation. Isoniazid may interfere with the activity of other nutrients, including vitamin B3 niacin , vitamin B12 , vitamin D , and vitamin E , folic acid , calcium , and magnesium.

Supplementation with vitamin B6 is thought to help prevent isoniazid-induced niacin deficiency; however, small amounts of vitamin B6 e. People should consider using a daily multivitamin-mineral supplement during isoniazid therapy.

Anemia is an uncommon side effect experienced by people taking anticonvulsant drugs. Though many researches believe that low blood levels of folic acid are involved, the effects might be caused by a vitamin B12 deficiency. Deficiencies of folic acid and vitamin B12 can lead to nerve and mental problems. One study revealed that individuals on long-term anticonvulsant therapy, despite having no laboratory signs of anemia, had dramatically lower levels of vitamin B12 in their cerebrospinal fluid the fluid that bathes the brain when compared with people who were not taking seizure medications.

Improvement in mental status and nerve function was observed in a majority of symptomatic individuals after taking 30 mcg of vitamin B12 daily for a few days. Another study found that long-term anticonvulsant therapy had no effect on blood levels of vitamin B The results of these two studies indicate that people taking anticonvulsant drugs might experience side effects of vitamin B12 deficiency, and that the deficiency is not easily detected by the usual blood tests.

Therefore, individuals taking anticonvulsant drugs for several months or years might prevent nerve and mental problems by supplementing with vitamin B Oral contraceptives use has been associated with increased absorption of calcium and copper and with increased blood levels of copper and vitamin A. Oral contraceptivess may interfere with manganese absorption. Metformin therapy has been shown to deplete vitamin B12, and sometimes, but not always, folic acid as well.

This depletion occurs through the interruption of a calcium-dependent mechanism. People taking metformin should supplement vitamin B12 and folic acid or ask their doctor to monitor folic acid and vitamin B12 levels. Stomach acid is needed for vitamin B12 in food to be absorbed by the body. Omeprazole interferes with the absorption of vitamin B12 from food though not from supplements in some but not all studies.

A true deficiency state, resulting in vitamin Bdeficiency anemia, has only been reported in one case. The fall in vitamin B12 status may result from the decrease in stomach acid required for vitamin B12 absorption from food caused by the drug. This problem may possibly be averted by drinking acidic juices when eating foods containing vitamin B However, all people taking omeprazole need to either supplement with vitamin B12 or have their vitamin B12 status checked on a yearly basis.

Even relatively small amounts of vitamin B12 such as 10—50 mcg per day, are likely to protect against drug induced vitamin depletion. Penicillamine may increase vitamin B6 excretion, reduce activity, and increase the risk for vitamin B6 deficiency. It makes sense for people taking penicillamine to supplement with small 5—20 mg per day amounts of vitamin B6. Some researchers have suggested that as much as 50 mg per day of vitamin B6 may be necessary. Though the cause may be folic acid deficiency in many cases, a deficiency of vitamin B12 may also be a factor in some instances.

Despite these contradictory findings, people taking anticonvulsant drugs for several months or years might prevent nerve and mental problems by supplementing with vitamin B Stomach acid is needed to release vitamin B12 from food so it can be absorbed by the body. H-2 blocker drugs reduce stomach acid and are associated with decreased dietary vitamin B12 absorption. Lab tests can determine vitamin B12 levels.

Sulfonamides, including sulfamethoxazole, can interfere with the activity of folic acid, vitamin B6, and vitamin K. This is generally not a problem when taking sulfamethoxazole for two weeks or less. People taking sulfamethoxazole for longer than two weeks should ask their doctor about nutrient monitoring and supplementation.

Note: Since sulfamethoxazole is often prescribed in combination with trimethoprim for example, in Bactrim or Septra , it may be easy to associate this interaction with trimethoprim. However, this interaction is not known to occur with trimethoprim alone.

Theophyline has been associated with depressed serum vitamin B6 levels in children with asthma and adults with chronic obstructive pulmonary disease. In a short-term study of healthy adults, theophylline reduced serum vitamin B6 levels and supplementation with vitamin B6 10 mg per day normalized vitamin B6 levels.

Some doctors believe that it makes sense for people taking this drug to accompany it with 10 mg of vitamin B6 per day. AZT can inhibit crucial DNA-related riboflavin activity, which may be normalized by riboflavin supplementation.

A year-old woman with AIDS and lactic acidosis received a single dose of 50 mg of riboflavin, after which her laboratory tests returned to normal and her lactic acidosis was completely resolved. More research is needed to confirm the value of riboflavin for preventing and treating this side effect.

Persons with AIDS have developed lactic acidosis and fatty liver while taking didanosine and other drugs in its class. Didanosine can inhibit crucial DNA-related riboflavin activity, which may be normalized by riboflavin supplementation. Docetaxel may cause a reddening, swelling, and pain in hands and feet. Two cases have been reported of people suffering these drug-induced symptoms and responding to 50 mg of vitamin B6 given three times per day.

Symptoms began to resolve in 12 to 24 hours and continued to improve for several weeks. Animal research suggests doxorubicin may deplete riboflavin and that riboflavin deficiency promotes doxorubicin toxicity. Increased blood levels of homocysteine are associated with increased risk of atherosclerosis and heart disease. One study revealed that fenofibrate dramatically increases blood homocysteine levels, though blood levels of vitamins were not reduced.

In one study, supplementation with 10 mg per day of folic acid prevented the increase in homocysteine levels resulting from fenofibrate therapy. Further research is needed to determine whether supplemental vitamin B6 and vitamin B12, which are also capable of lowering homocysteine levels, might lower fenofibrate-induced elevations in homocysteine levels. Fluorouracil occasionally causes problems on the skin of the palms and soles.

Preliminary reports have appeared showing that mg per day of vitamin B6 can sometimes eliminate the pain associated with this drug-induced condition. In a study of guinea pigs, a single intramuscular injection of methylcobalamin a form of vitamin B12 , in the amount of mg per 2. No studies have been done to determine whether the same protective effect would occur in humans.

Oral contraceptives have been associated with vitamin B6 depletion and clinical depression. In a small, double-blind study of women with depression taking oral contraceptivess, vitamin B6 20 mg twice per day improved depression. Half of the women in the study showed laboratory evidence of vitamin B6 deficiency. Vitamin E along with vitamin B6 was used to treat a side effect of risperidone called neuroleptic malignant syndrome in a year-old woman, and results were encouraging.

However, whether vitamin E and vitamin B6 supplementation might help prevent this condition in people taking risperidone is unknown. Though the cause may be folic acid deficiency in many cases, a deficiency of vitamin B12 may also be a factor in some cases. One study revealed that individuals on long-term anticonvulsant therapy had dramatically lower levels of vitamin B12 in their cerebrospinal fluid the fluid that bathes the brain when compared with people who were not taking seizure medications.

Children with alopecia areata who supplemented mg of zinc and 20 mg biotin each day, combined with topical clobetasol, showed more improvement compared to children who took oral corticosteroid drugs.

Controlled research is needed to determine whether adding oral zinc and biotin to topical clobetasol therapy is more effective than clobetasol alone. However, until more information is available, caregivers should consider that children with alopecia who are currently taking oral corticosteroids might benefit from switching to supplements of zinc and biotin along with topical clobetasol. Giving 10 mg per day each of vitamins B1 , B2 , and B6 to elderly, depressed persons already on tricyclic antidepressants improved their depression and ability to think more than placebo did.

The subjects in this study were institutionalized, so it is unclear if these results apply to persons living at home. Combination of 6 grams per day L-tryptophan and 1, mg per day niacinamide a form of vitamin B3 with imipramine has shown to be more effective than imipramine alone for people with bipolar disorder. These levels did not improve the effects of imipramine in people with depression.

Lower amounts 4 grams per day of L-tryptophan and 1, mg per day of niacinamide did show some tendency to enhance the effect of imipramine. The importance of the amount of L-tryptophan was confirmed in other studies, suggesting that if too much L-tryptophan 6 grams per day is used, it is not beneficial, while levels around 4 grams per day may make tricyclic antidepressants work better.

Akathisia is an adverse reaction to anti-psychotic drugs, where a person has an uncontrollable desire to be in constant motion. One preliminary report suggested that 4, mg of L-tryptophan and 25 mg niacin per day taken with benztropine enhances the treatment of akathisia. Controlled studies are necessary to determine whether L-tryptophan and niacin supplements might benefit most people taking benztropine who experience adverse reactions to anti-psychotic drugs.

Folic acid and vitamin B6 have been used to reduce elevated blood levels of homocysteine , which has been associated with atherosclerosis. Although deficiency in this vitamin is rare in the United States, it can lead to muscle weakness, depression, irritability, short term memory loss , nervousness, and difficulty concentrating.

Adults need only 2. Pregnant or breastfeeding teens and women need more: 2. Vitamin B12 is not naturally occurring in plant foods, so vegetarians and vegans may not get enough in their diets and may need to take a B supplement. Natural sources rich in vitamin B12 are dairy products, fish, meat, and — in particular — beef liver and clams. This type of vitamin B can also be found in fortified items like breakfast cereals and nutritional yeast.

Vitamin B12 is essential for building blood cells and maintaining healthy nerve cells in the body. As many as 15 percent of people in the United States have a vitamin B12 deficiency, which can lead to anemia. Symptoms of B12 deficiency include weakness, fatigue, constipation , weight loss, and loss of appetite. Deficiency is also damaging to the nervous system and can cause depression, confusion, and dementia.

Vitamin B9, also called folic acid or folate, is a nutrient that's necessary for the body's growth and development. The National Institutes of Health recommends that adults get micrograms mcg daily, while breast-feeding mothers need mcg a day, and pregnant teens and women should get mcg a day. Naturally occurring folate is found in many sources, including dark-green leafy vegetables, asparagus, brussels sprouts, oranges, nuts, beans, and peas.

In addition, folic acid is added to many fortified foods such as cereals and breads. Teens and women who are pregnant or planning to get pregnant may find it difficult to get enough folate, but this B vitamin is vital to a baby's health and development.

Getting enough folate prevents neural tube brain and spine birth defects in babies and promotes healthy growth. The Office of Dietary Supplements of the National Institutes of Health recommends talking with your healthcare providers about any dietary supplements you take. By subscribing you agree to the Terms of Use and Privacy Policy. Health Topics. Health Tools. Heart Health. By Jennifer J. Reviewed: January 5, Although it may be beneficial to take more than the recommended dietary allowance of certain vitamins, you should never take more than the tolerable upper intake level unless specifically instructed by a doctor to do so.

Some B vitamins, such as vitamin B12, thiamin, biotin, pantothenic acid and riboflavin, don't have tolerable upper intake levels. This means that you're unlikely to experience adverse reactions when taking these vitamins, even if you take high doses. However, folate, vitamin B6 and niacin do have a tolerable upper intake levels. Getting more than 1, micrograms a day of folate, 35 milligrams a day of niacin or milligrams a day of vitamin B6 may cause unpleasant side effects.

Avoid taking a vitamin B complex supplement that contains more than these amounts. The most common side effects of taking too much of a vitamin B complex include diarrhea and abdominal cramps. More serious side effects include tingling or redness of the skin and nerve damage. The folic acid in the supplement may also mask a vitamin B12 deficiency or may trigger a seizure in patients taking anticonvulsant medications when taken in excess. High doses of these supplements may also negatively interact with certain medications.

B12 Cobalamin : Cobalamin is vital for neurological function, DNA production and red blood cell development. B12 are found in the animal sources like meats, eggs, seafood and dairy. Vitamin B Complex Uses: This substance is a mixture of vitamins B that is used for the treatment or prevention of vitamin deficiency due to inadequate nutrition, some diseases, alcoholism or pregnancy. Vitamins are vital components of the body and help keep you in good health.

Ingredients such as vitamin C, vitamin E, biotin, or zinc are also found in certain brands of B vitamins. In sustaining good health and well-being, vitamins B play a crucial role.

Vitamins B have a significant effect on your energy levels, brain activity, and cell metabolism as the building blocks of a healthy body.

Vitamin B complex helps avoid infections and helps support or encourage: Cell health Growth of red blood cells Energy levels Good eyesight Healthy appetite Proper nerve function Hormones and Cholestrol production Cardiovascular health Vitamin B Complex Side effects: Some of the common and serious side effects of Vitamin B Complex are: Stomach Cramp Rashes Itching Dizziness Trouble in breathing Vomiting High blood sugar levels Precautions: Before taking Vitamin B complex talk with your doctor if you are allergic to it or any other medication.

The product may contain some excessive presence of inactive ingredients which can lead to some serious allergic reactions. If you are having any medical history then talks with your doctor immediately: Diabetes Liver problems Vitamin B12 deficiency How to take Vitamin B Complex?

Take Vitamin B complex orally and once a day. Chew the tablet carefully before swallowing if you're taking chewable tablets. Swallow them whole if you're taking extended-release capsules. If the time for the next dose is close, skip the skipped dose. At your normal time, take your next dose.