Vitamin B12 boosts metabolism, keep blood and nerve cells healthy, and prevents megaloblastic anemia. Find out the effects of too much intake of vitamin B12 herein.

Vitamin B12 is linked to various health benefits, such as improving blood and nerve cells, preventing megaloblastic anemia, and making DNA. It is obtained through supplements or diet, such as meat, fish, milk, eggs, and cheese. A deficiency of this nutrient is characterized by a skin disorder, tiredness, weakness, and heart problems. However, its overdose is associated with many severe health problems that result in death.Optimal dosing of vitamin B12 varies with age. For instance, the recommended dose for adults is 2.4 mcg. This article highlights health problems resulting from vitamin B12 overdose.

Effects of too much vitamin B12

Vitamin B12 overdose results in severe health problems that must be handled professionally. Furthermore, their symptoms are frustrating and discouraging. Below are the effects of its high intake.


There are many types of cancer, such as prostate, throat, skin, and cervical cancer. Vitamin B12 overdose is linked to certain types of cancer, even though there are other causes, especially lifestyle changes. Although Doctors’ reports state that increased intake of vitamin B12 may lower the risk of breast and cervical cancer, it contributes to lung cancer, especially in smokers. For instance, folic acid in vitamin B12 supplements kills lung cells causing lesions that form tumor.There is a high chance of death from lung cancer caused by excess intake of vitamin B12. Therefore, it is important to carry out frequent lung screening when on vitamin B12 dose.Consult your doctor to determine the recommended dosage for the specific person to avoid falling into this condition.


Diabetic people experience hard times, especially those with low incomes.Diabetes is a life-threatening condition that has no exact cure and can attack any person.The condition is symptomized by hunger, thirst, blurry vision, tiredness, dry skin, and unnecessary weight loss.Furthermore, it is caused byhigh blood pressure, impaired glucose tolerance, overweight, sedentary lifestyle, polycystic ovary syndrome, and family history.A deficiency of vitamin B12 leads to anemia, symptomized by fatigue, weakness, pale or yellowish skin, irregular heartbeat, dizziness, chest pain, and cold hands and feet. However, high intakeresults in diabetes.

Liver disease

High intake of vitamin B12 is linked to liver disease that results in death. This condition is symptomized by fatigue, nausea, vomiting, yellowish eyes, legs and ankles swelling.Liver is linked to synthesis, excretion, metabolism, and storage of essential compounds in the body, such as plasma proteins. For instance, it is linked to the metabolism offats, proteins, and carbohydrates.Furthermore, it synthesizes plasma proteinsand excretes drugs, hormones, and cholesterol. Therefore, its damage increases the risk of death.Vitamin B12 is stored in the liver for a long time before it is passed out in the urine.However,its absorption in the intestines of people with cirrhosis is poor. Therefore, ifsuch people continue to take it for a long time, their health can be severely affected, resulting in death.

Kidney failure

High intake of vitamin B12 results in kidney failure, even though other factors are linked to this problem. The kidneys excrete regulate PH and ion concentration, and produce hormones.Kidney disease is symptomized by stained urine, poor sleep, dry skin, tiredness, and foamy urine. People with this condition are advised to reduce vitamin B12 intake to avoid confusion, seizures, nausea, swelling of legs, and fatigue.


Too much vitamin B12 results in insomnia, a common sleeping disorder, even thoughstress, poor sleep habit, and eating too late in the eveningare other causes. There are three types of insomnia including acute, transient, and chronic insomnia. How do you know that you have insomnia?It is catheterized by difficulty to fall asleep, waking up too early, tiredness, depression, anxiety, poor memory, accidents, and daytime sleepiness.


Vitamin B12 overdose results in diarrhea. It is characterized by bleeding, fever, abdominal cramps, frequent loose, stained, and watery stool.If you are taking a vitamin B12 supplement, stick to the prescribed dose. You can relieve diarrhea by resting, limiting stress, and drink plenty of clear water. Furthermore, avoid a diet of fats, sugar, dairy, and caffeine.


Vitamin B12 is one of the Bvitamins with fewer side effects. It improves blood and nerve cells healthily, prevents megaloblastic anemia, and makes up DNA. You canobtainit through supplements or foods, such as meat, fish, milk, eggs, and cheese. A deficiency of this nutrient is characterized by a skin disorder, tiredness, weakness, blurred vision, smooth tongue, lightheadedness, and heart problems. However, its overdose results in diarrhea, insomnia, kidney failure, diabetes, cancer, and liver disease. Furthermore, minor cases include headache, vomiting, nausea, tingling sensation in hands and feet, fatigue, and weakness.

Crystal Kadir

MS, Durham University

The work of a family doctor includes a wide range of clinical diversity, which requires extensive knowledge and erudition from a specialist. However, I believe that the most important thing for a family doctor is to be human because the cooperation and understanding between the doctor and the patient are crucial in ensuring successful health care. On my days off, I love being in nature. Since childhood, I have been passionate about playing chess and tennis. Whenever I have time off, I enjoy traveling around the world.

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