If your doctor has directed you to use this medication, remember that your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. However, B12 supplements may help increase energy levels and reduce fatigue those who are deficient in this nutrient ( 20). In most cases, a weekly dosage of 1,000 mcg of vitamin B12 is enough. Extremely high doses of vitamin B12 from injections You should not use Vitamin B12 if you are allergic to cyanocobalamin or cobalt, or if you have Leber's disease (an inherited form of vision loss). Cyanocobalamin can lead to optic nerve damage (and possibly blindness) in people with Leber's disease.

Cyanocobalamin tablets are available on prescription. These come as 50 and 1,000 microgram (μg) tablets. One review recommended that those with vitamin B12 deficiency take 1 mg of vitamin B12 daily for a month, followed by a maintenance dose of 125–250 mcg per day ( 21).

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There are many brands and forms of cyanocobalamin ( vitamin B12) available. Read the dosing instructions carefully for each product because the amount of cyanocobalamin ( vitamin B12) may be different between products. Vitamin B12 has the potential to interact with certain medications. In addition, several types of medications might adversely affect vitamin B12 levels. A few examples are provided below. Individuals taking these and other medications on a regular basis should discuss their vitamin B12 status with their health care providers. Gastric acid inhibitors The amount of cyanocobalamin you need depends on the level of vitamin B12 in your blood and why your levels are low. Your doctor or pharmacist will advise you on what dose to take. In particular, its Garden of Life Vitamin Code Raw B12 is a great option for people who prefer natural ingredients. It contains vitamin B12 derived from cultures of Saccharomyces cerevisiae, a yeast that is naturally occurring in some foods and is also known as brewer’s or baker’s yeast. Vitamin B12 is a water-soluble vitamin that your body uses for various processes, including energy production, DNA synthesis, and the development and function of your central nervous system.

However, you may want to take more or less, depending on your age, lifestyle, and specific situation.Moreover, injections of high dosages of vitamin B12 are very safe. Even when vitamin B12 is administered intramuscularly up to 3,000 times the recommended dietary allowance, it hasn’t any toxic effect. [ 5] Guidelines for vitamin B12 supplementation How to take vitamin B12 supplements?

However, a few observational studies have found no such association [ 88, 89]. In addition, according to a systematic review of 35 prospective cohort studies in 14,325 participants age 47 to 101 years followed for an average of 5.4 years, the evidence does not support a role for low vitamin B12 in the development of cognitive impairment or dementia [ 90].So you might be wondering: how much vitamin B12 should I take daily? Health experts’ recommended daily allowances (RDAs) for B12 intake recommendations vary by age, but the recommendations are the same regardless of your sex [1]: The U.S. Department of Agriculture’s (USDA's) FoodData Central [ 20] lists the nutrient content of many foods and provides a comprehensive list of foods containing vitamin B12 arranged by nutrient content and by food name. Dietary supplements No matter which testing option you use, the next step is to review the results with your healthcare provider. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/ tongue/throat), severe dizziness, trouble breathing.