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Can Too Much B12 Cause Insomnia

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Hypervitaminosis B: Side Effects Of Too Much Vitamin B

Is Too Much B12 Bad (Can You Take Too Much b12?)

Disclaimer: Results are not guaranteed*** and may vary from person to person***.

Hypervitaminosis B is a condition where there is too much vitamin B intake, especially in supplement form. As a result, too much vitamin B symptoms may include nerve toxicity, jaundice and liver toxicity, nausea, and digestive issues.

Vitamin B complex supplements comprise a combination of all B vitamins, which include:

Since B vitamins are water soluble, excess amounts will not build up in the body. Instead, they will be excreted through the urine.

That being said, taking exceptionally high dosages of these B complex vitamins can lead to a variety of health risks and side effects.

This article will detail the major side effects of too much vitamin B, including lung cancer in men and the effect of too much vitamin B6 while pregnant, as well as the specific health risks associated with too much vitamin B1, vitamin B2, vitamin B3, vitamin B5, vitamin B6, vitamin B9 , and vitamin B12.

In This Article:

What Causes Extremely High B12 Levels

Recent ingestion or injection of supplemental vitamin B12 are the most common causes of high B12 in the blood. It is not a concern to overdose on B12 supplements because excess can be excreted in your urine. It could also be from your diet if you consume a lot of animal products like meat, eggs, and shellfish.

Recommended Use Dosage And Possible Interactions

Folic acid is included in most multivitamins, prenatal supplements, and B complex vitamins, but its also sold as a supplement. In certain countries, some foods are also fortified with the vitamin.

Folic acid supplements are typically recommended to prevent or treat low blood folate levels. Moreover, those who are pregnant or are planning to become pregnant often take them to reduce the risk of birth defects .

The Recommended Dietary Allowance for folate is 400 mcg for those over 14. People who are pregnant and breastfeeding should get 600 and 500 mcg, respectively. Supplement doses typically range from 400800 mcg .

You can purchase folic acid supplements without a prescription. Theyre generally considered safe when taken in normal doses .

That said, they can interact with some prescription medications, including some that are used to treat seizures, rheumatoid arthritis, and parasitic infections. Thus, if youre taking other medications, its best to consult a health professional before using folic acid supplements .


Folic acid supplements are used to reduce the risk of birth defects and prevent or treat folate deficiency. Theyre generally considered safe if taken in recommended amounts but may interact with some prescription drugs.

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Top 7 Foods Rich In Vitamin B12

1. Beef Liver

Liver is very rich in vitamin B12. In fact, only one ounce of beef liver meets your daily recommended intake of the vitamin. It also helps with anemia as it is full of folate and iron, too. You should look for liver from pasture-raised or grass-fed cows, as the quality will be better.

2. Sardines

Sardines are high in both vitamin B12 and omega-3 fatty acids. The combination of nutrients help with asthma, increases heart health and fights inflammation. Eating sardines has been associated with several health benefits.

3. Atlantic Mackerel

The Atlantic sardine is full of B12 and omega-3 fatty acids, too. Not to be confused with the king mackerel, this fish is low in sodium. It has been ranked as one of the top fish for health.

4. Lamb

While not as popular in the U.S. as other countries, adding lamb to your diet is a great way to supplement your diet. Since there really isnt such a thing as too much vitamin B12 side effects, you can add this highly nutritious meat without fearing a vitamin overload. Lamb is also full of iron, protein, zinc, and selenium, which are effective in boosting your immunity.

5. Wild-Caught Salmon

6. Feta Cheese

Feta cheese is full of vitamin B12, riboflavin and calcium. It is traditionally made from sheeps milk, but can be made from a combination of sheep and goat milk as well. Because of its high riboflavin level, it has been found helpful in the prevention of migraines. The best source is that made from raw sheep milk.

Identifying Vitamin B Deficiency

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B vitamin deficiency isnt necessarily easy to spot. Thats because there are many different B vitamins, and a deficiency in one might look different from a deficiency in another. Each B vitamin does something different to its neighbors, and so when you lack in one, you might experience fatigue but lack in another might cause skin rashes.

Lets take a brief look at the different symptoms of vitamin B deficiency.

  • Vitamin B12 deficiency can cause anemia, confusion, fatigue, weakness, and depression.
  • Vitamin B6 deficiency can cause anemia, confusion, depression, nausea, and rashes.
  • Very few people lack B1 and B2 because theyre so common. However, a deficiency can cause confusion too.
  • Vitamin B3 deficiency can cause digestive issues, nausea, and abdominal cramps.
  • Vitamin B9 deficiency can cause anemia and diarrhea.

Thats an incredible range of problems. Unfortunately, diagnosing a lack of B vitamins isnt as easy as diagnosing other physical conditions. If you have measles, for example, there are easy-to-spot symptoms that make the condition obvious. But a vitamin or mineral deficiency is much harder to spot because the symptoms are more generic. If youre in doubt, talk with a healthcare professional to find out more.

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When Should You See A Doctor

If you notice any adverse effects after you start taking vitamin B-12 supplements, you should discontinue use immediately. Seek medical attention if your symptoms get worse or are severe.

You can consult your doctor to establish an appropriate dose if its determined that you dont get enough B-12 from food sources.

Other Symptoms Of Vitamin B12 Deficiency

More general symptoms of vitamin B12 deficiency are listed by the NHS:

  • Extreme tiredness
  • Hearing sounds coming from inside the body, rather than from an outside Source
  • Loss of appetite and weight loss

Bupa adds: If you have vitamin B12-deficiency anaemia, you may also look pale or jaundiced .

As well as the symptoms of anaemia, vitamin B12-deficiency may cause symptoms related to your nerves. This is called vitamin B12 neuropathy. It may affect your movement and sensation, especially in your legs, cause numbness or pins and needles and decrease your sensitivity to touch, vibration or pain. It can also cause confusion, depression, poor concentration and forgetfulness.

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Side Effects Of Vitamin B3 Overdose

When you get vitamin B3 from food, an overdose is unlikely to occur. But, vitamin B3 supplementation is a different story. This can lead to possible side effects of too much vitamin B3, such as blurry vision, disorientation, nausea, vomiting, abdominal pain, bloating, nervousness, and headaches.

It is also possible to experience a vitamin B3 side effect called a niacin flush, which produces symptoms like burning, itching, a tingling sensation in the chest and face, and severe skin flushing with dizziness.

Liver damage, jaundice, and stomach ulcers may also occur from very high vitamin B3 doses.

Also, avoid taking too much vitamin B3 if you have gout, ulcers, gallbladder disease, liver disease, diabetes, had a recent heart attack, or are pregnant. If you take vitamin B3 to lower cholesterol, be sure to do so under a doctors supervision.

Medication interactions associated with vitamin B3 include atorvastatin, benztropine, carbidopa, levodopa, cerivastatin, fluvastatin, gemfibrozil, glimepiride, isoniazid, lovastatin, minocycline, oral contraceptives, pravastatin, repaglinide, rosuvastatin, simvastatin, tetracycline, thioridazine, and tricyclic antidepressants.

How much vitamin B3 should you take? According to the Institute of Medicine at the National Academy of Sciences, the following is the recommended dietary allowance for vitamin B3 daily:

  • Males 14-plus years: 16 mg
  • Females 14-plus years: 14 mg
  • Pregnant females: 18 mg
  • Breastfeeding females: 17 mg
  • salmon
  • winter squash

Side Effects Of Vitamin B2 Overdose

FATIGUE, INSOMNIA, SLEEPLESS, LACK OF SLEEP || Vitamin B12 Deficiency | Pernicious Anemia

Taking too much vitamin B2 is also rare, but there are side effects to consider of a riboflavin overdose.

Too much vitamin B2 side effects include increased urine frequency, diarrhea, allergic reactions like hives, difficulty breathing, and swelling of the tongue or face. Vitamin B2 will also cause the harmless side effect of turning your urine to a yellow-orange color.

Medication interactions associated with vitamin B2 include zidovudine , didanosine, doxorubicin, oral contraceptives, tetracycline, and tricyclic antidepressants.

How much vitamin B2 should you take? According to the Institute of Medicine at the National Academy of Sciences, the following is the recommended dietary allowance for vitamin B2 daily:

  • Males 14-plus years: 1.3 mg
  • Females 14 to 18 years: 1.0 mg
  • Females 19-plus years: 1.1 mg
  • Pregnant females: 1.4 mg

You can also get vitamin B2 from food. Whole foods high in vitamin B2 include:

  • collard greens
  • mushrooms

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Seize The Night With Melatonin

While melatonin has only now been making waves in the press recently, its been making waves in the brain for millennia.

Melatonin is a naturally occuring hormone that aids in the regulation of the bodys circadian rhythm. Studies suggest that taking melatonin supplements can really help to get you better, more restful sleep.

Alternative Causes Of Insomnia And Sleeplessness

Almost anything can cause a lack of sleep. If youre not sure what exactly the problem is, scroll through our list and tick off each cause. You might be surprised at whats causing your trouble sleeping.

Environmental Causes

Environmental causes are an obvious culprit. Noise, light, or other disturbances may wake you up completely but they may also only disturb your sleep somewhatnot enough to wake you up, but enough to rouse you from a deep sleep. This can cause tiredness later in the day.

Mental Illness

A whole host of mental conditions including stress, anxiety, nerves, and depression can cause a lack of sleep. In turn, a lack of sleep can make these conditions worsea vicious cycle. Try relaxing techniques like meditation before bed to see if they can help.

Physical Illness

Physical illness can cause discomfort and trouble sleeping. Obesity and diabetes can make you too hot at night, or cause cramp and pain. Any condition that causes pain can keep you awake at night, from multiple sclerosis to the flu.


Lifestyle choices may also play a part. Excess caffeine, nicotine, or alcohol can disrupt sleeping patterns, as can being overweight or obese. Having a job that necessitates working in the evening, sleeping late or going to bed late, and eating at night can also be at fault.

Delayed Sleep Phase Disorder

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Tingling Sensation Or Numbness

  • In rare cases, people who take high doses of vitamin B for a long period of time may experience extreme numbness or a tingling sensation. In some patients, tingling sensation is experienced mostly in the right side of the body. This symptom is one of the early warning indicators of Vitamin B12 overdose.
  • Can Too Much Vitamin B12 Cause Side Effects

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    Vitamin B12 is water-soluble, released in your urine if youve consumed too much. Because of this, it is generally well-tolerated and rarely reaches toxic levels due to diet. It is very hard to overdose on vitamin B12, but you can put a moderate strain on your kidney if excess consumption occurs too often. Too much vitamin B12 side effects by overconsumption are rare.

    Watch Out for Medicine Interactions

    It is safe to consume too much vitamin B12, but keep in mind it may negatively interact with other medication. The most common effect of these medications is they do not allow your body to effectively absorb the amount of vitamin you need. One such medication is the antibiotic named chloramphenicol. Other types of drugs include those designed to relieve acid reflux and control Type 2 diabetes. If you need to take one of these medications, consult with your doctor as you may need to take a vitamin B12 supplement.

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    Does Vitamin B12 Deficiency Cause Insomnia

    Vitamin B12 deficiency is common in vegetarians and older people.

    It is responsible for a variety of neurological health problems.

    While its not overwhelming, there is some evidence that vitamin B12 deficiency may indirectly cause insomnia in some people. Other B-vitamins like niacin are also important for sleep.

    Well review that research quickly in this post.

  • Summary: Vitamin B12 and Insomnia
  • Can To Many B12 Pills Make It Difficult To Sleep

    Insomnia. It is possible to worsen insomnia by overdose of vitamin B. It can interfere with the normal sleep cycle when the B vitamins are consumed in excess of the normal amount. Vitamin B12 in the blood, especially vitamin B12, is an energy booster when taken in high doses.

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    How Much Vitamin B12 Is Too Much

    Vitamin B12 is a water-soluble nutrient that plays many critical roles in your body.

    Some people think that taking high doses of B12 rather than the recommended intake is best for their health.

    This practice has led many to wonder how much of this vitamin is too much.

    This article examines the health benefits, as well as potential risks of taking megadoses of B12.

    Theres no question that vitamin B12 is essential for health.

    This nutrient is responsible for numerous functions in your body, including red blood cell formation, energy production, DNA formation and nerve maintenance .

    Though B12 is found in many foods, such as meat, poultry, seafood, eggs, dairy products and fortified cereals, many people dont get enough of this important vitamin.

    Health conditions such as inflammatory bowel disease , certain medications, genetic mutations, age and dietary restrictions can all contribute to an increased need for B12.

    Vitamin B12 deficiency can lead to serious complications such as nerve damage, anemia and fatigue, which is why those at risk should add a high-quality B12 supplement to their diet .

    While people who consume adequate amounts of B12-rich foods and are able to properly absorb and utilize this nutrient dont necessarily need to supplement, taking extra B12 has been linked to some health benefits.

    For example, studies show that supplemental B12 may benefit people without a deficiency in the following ways:

    In Many Cases Diet Alone Doesnt Give Us All The Nutrients We Need

    Can Vitamin D Cause Insomnia? You bet!

      We know that diet and sleep are deeply connected. But the truth is, we dont know nearly enough yet about how individual nutrients impact our sleep. Here, I look at five vitamins that appear to play a role in how much sleep we get and how restful and high-quality that sleep is.

      As youll see, several of these vitamins may affect our risk of sleep disorders, including insomnia and sleep apnea. And at least two of them appear to play a role in regulating our circadian rhythms, the 24-hour biorhythms that control our sleep-wake cycles.

      Im a big believer in leveraging a healthy diet to improve sleep. Often, diet alone doesnt give us all the nutrients we need. Supplements can play an important role in filling those gaps.

      But before you run out and add the vitamins below to your supplement list, I encourage you to do two things. Look for ways to improve your vitamin intake through your diet. And talk to your doctor. Getting the dosingand the timingof supplement intake is critical to success when it comes to sleep.

      Always consult your doctor before you begin taking a supplement or make any changes to your existing medication and supplement routine. This is not medical advice, but it is information you can use as a conversation-starter with your physician at your next appointment.

      Vitamin D

      Vitamin E

      Vitamin C

      For memory protection Similar to vitamin E, vitamin C has been shown to offer protection for the brain against the memory loss associated with sleep deprivation.

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      Restless Leg Syndrome And Vitamin B12

      Like the name of the condition suggests, Restless Leg Syndrome is a condition where your legs cant stay still at certain times.

      RLS can of course make it harder to sleep and play a role in developing insomnia.

      While RLS is usually caused by iron deficiency, theres some evidence linking vitamin B12 deficiency and RLS .

      SummaryIts not a particularly likely scenario, but there appears to be some small chance of a vitamin B12 deficiency triggering RLS and leading to sleep trouble.

      Side Effects Of Vitamin B9 Overdose

      Folic acid is thought to be very dangerous when taken in high doses.

      In normal circumstances, folic acid ensures a healthy pregnancy, supports nerve health, and protects against depression, cancer, and dementia. However, in high dosages, folic acid can cause great damage to your central nervous system.

      As a result, too much vitamin B9 symptoms will include irritability, insomnia, malaise, intestinal dysfunction, movement disorders, pain or numbness, seizures, skin reactions, and paralysis.

      Folic acid supplements can interact with certain medications like methotrexate and drugs that treat cancer and autoimmune diseases. Taking folic acid with antiepileptic drug used for psychiatric diseases or epilepsy may reduce the serum levels of these drugs.

      Folic acid also may reduce the effectiveness of the ulcerative colitis treatment sulfasalazine, and interact with zinc and vitamin B6.

      How much folate should you take? According to the Institute of Medicine at the National Academy of Sciences, the following is the recommended dietary allowance for folate daily:

      • Males and females 14 and over: 400 micrograms
      • Pregnant females: 600 mcg

      Food high in folate include:

      • calfs liver
      • bell peppers

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      How To Tell If Vitamins Is Causing A Lack Of Sleep

      There are many steps you can take to make sure B vitamins enhance your sleep, rather than interfere with it. These will help you figure out whether its B vitamins or another factor thats causing your lack of sleep.

      Go through each step one by one to make sure:

      • Start taking your B vitamins earlier in the day, rather than later at night. Since they interfere with your sleep schedule, taking them late at night can make your sleep less restful. The problem may be as simple as that.
      • Cut down on your intake, for instance by only taking half a tablet at a time. It may be that youre taking too much without knowing, or that your body processes B vitamins slower than normal.
      • Stop taking B vitamins for a brief period. Take note of how well you sleep over the course of a week, perhaps in a sleep diary. Identify any improvements, i.e., longer sleep, or more restful sleep.
      • Cut out other supplements to see if it was something other than your B vitamin complex tablet. As mentioned in the study above, multivitamins can cause restless sleep, not just B vitamins.
      • Talk with your doctor if you still cant figure out the cause. It may be a completely unrelated condition thats making your sleep less restful. Your lack of sleep may be a sign of something more serious.

      If your B vitamins were causing your poor sleep, these five steps should be enough to establish the fact. Before you see a doctor, though, it might help you to look at our list of other causes of insomnia below.

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