Absorption of the nutrient is a two-step process. The amount of vitamin B12 a person needs each day depends on their age:. Vitamin B12 deficiency has both physical and neurological symptoms. Physically, low levels of vitamin B12 can cause megaloblastic anemia, fatigue, weakness, constipation, appetite loss, and weight loss.
These neurological issues can occur without anemia and can become permanent if not rectified promptly NIH, n. With a wide range of natural sources, most people get enough vitamin B12 through their diet; however, some individuals are vitamin B12 deficient and may be in need of supplemental vitamin B People in the following categories may not get sufficient amounts of vitamin B12 or may not be able to absorb it well:. People in these categories are typically the ones prescribed vitamin B12 injections.
For these individuals, correct vitamin B12 injection dosage can greatly improve their health. While high doses of oral vitamin B12 may be effective, doctors typically treat vitamin B12 deficiency with injections because this method bypasses potential barriers to absorption. When determining the proper vitamin B12 injection dosage, decisions vary based on why the vitamin B12 injection is needed. As this list indicates it is important to be proactive about communicating any side effects to your doctor promptly.
This list is not meant to be complete or to be used for self-diagnostic purposes. Do I have to go to the doctor for every vitamin B12 dosage? If you feel comfortable administering the injections yourself or having someone trusted to give you the shot, you can ask your doctor to show you how to administer the shot at home.
Also, patients can buy b12 shots online. Are there any diet restrictions I should adhere to while taking vitamin B12? Even moderate use of alcohol could decrease vitamin B12 levels. Vitamin B12 is an essential nutrient, naturally found in animal proteins or fortified into cereals or yeasts. Most people can get proper levels through their diet. For those experiencing symptoms of low vitamin B12 levels, the best course of action is to speak with your doctor or health care professional.
They are the ones who determine the proper dosage. When speaking with your doctor, you will want to make sure he is aware of all your medications as well as your symptoms. When you speak with your doctor about your prescription, you want to make sure your vitamin B12 injection dosage comes from a trusted source.
Invigor Medical is a US-based pharmacy. You should always consult a practicing professional who can diagnose your specific case.
Additionally, vitamin B12 is important for energy production. Vitamin B12 is found mostly in animal products, including meats, seafood, dairy products, and eggs. Over time, B12 deficiency can lead to complications like anemia, nerve damage, and fatigue. Vitamin B12 deficiency can be caused by not getting enough of this vitamin through your diet, problems with absorbing it, or taking a medication that interferes with its absorption 4.
The following factors may put you at a higher risk of not getting enough vitamin B12 from diet alone 5 , 6 :. Vitamin B12 is an important nutrient that plays a critical role in your body. The recommended daily intake RDI for vitamin B12 for people over 14 is 2.
However, you may want to take more or less, depending on your age, lifestyle, and specific situation. For people over 14, the RDI for vitamin B12 is 2. For example, if you ate two eggs for breakfast 1. However, if you have any of the factors described above that interfere with vitamin B12 intake or absorption, you may want to consider taking a supplement.
Older people are more susceptible to vitamin B12 deficiency. As you age, your body naturally makes less stomach acid and intrinsic factor — both of which can affect the absorption of vitamin B Stomach acid is necessary to access the vitamin B12 found naturally in food , and intrinsic factor is required for its absorption.
Due to this increased risk of poor absorption, the National Academy of Medicine recommends that adults over the age of 50 meet most of their vitamin B12 needs through supplements and fortified foods 1. Higher doses of up to 1, mcg 1 mg may be necessary for some Pregnant women have slightly higher vitamin B12 needs than the general population.
Low maternal levels of this vitamin have been associated with birth defects in infants This material may not otherwise be downloaded, copied, printed, stored, transmitted or reproduced in any medium, whether now known or later invented, except as authorized in writing by the AAFP. Contact afpserv aafp. Want to use this article elsewhere? Get Permissions. Read the Issue. Sign Up Now. Next: Anticholinergic Drugs for Overactive Bladder.
Jan 1, Issue. Am Fam Physician. Clinical Question Can vitamin B 12 deficiency be treated orally? Evidence-Based Answer In patients with vitaminB 12 deficiency, two oral regimens have been shown to achieve neurologic and hematologic response in the short term.
Practice Pointers Vitamin B 12 deficiency causes macrocytic anemia, fatigue, loss of appetite, and mood disturbances. There is no upper limit for the intake of vitamin B12 because the risk of toxicity or overdose is low. However, vitamin B12 shots may have other side effects. If a person experiences the following, or if these issues persist or worsen, they should seek medical advice:.
There may also be a risk of :. If anyone experiences difficulty breathing, hives, and swelling, they need emergency medical help. They may be experiencing anaphylaxis, which is a severe allergic reaction.
Vitamin B12 may interact with certain medications. People must always inform a doctor about all prescription and over-the-counter drugs they are taking before receiving a vitamin B12 shot.
Those who have allergies or medical conditions should always inform a doctor before receiving a vitamin B12 shot. Most people get enough vitamin B12 from their diet, but some people have a deficiency. This can be due to having low levels of intrinsic factor in the digestive system, having a digestive condition, or following a plant-based diet. The — Dietary Guidelines for Americans recommend meeting the need for vitamin B12 and other nutrients through diet first and foremost.
If dietary sources are insufficient, however, a doctor may recommend supplementation through pills or injections, depending on the cause of the deficiency. Vitamin D is an essential nutrient, but it can be difficult for people to know if they are getting the right amount.
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