Setting Realistic Expectations from Vitamin B12 Injections


Vitamin B12 injections are an alternative to oral use under certain conditions which you may wish to know ...



vitamin b12 injectionsVitamin B12, also called cobalamin, is an essential nutrient that performs many functions in the body including the support of nerve health and the production of new genetic material. Deficiencies in cobalamin can result in numbness and tingling of the hands and feet, diarrhea and upset stomach, and even neurological damage. To counteract such symptoms, Vitamin B12 injections are often administered by doctors instead of their oral counterparts.

What to Expect in Benefits

Many will wonder why cobalamin injections are as popular as the oral supplements. After all, injections can be painful especially in the case of Vitamin B12 as the needle is placed in the intramuscular region. Doctors have their reasons of which the following are the most notable:

  • Injections allow for a flexible dosing schedule. In people with pernicious anemia, such scheduling is convenient considering that the injections are given frequently during the first few weeks - once every 2 days is considered normal - and then will taper off as the vitamin takes hold in the system. You may even have the Vitamin B12 injections just once in a month and then once every few months. You will then have one less thing to remember - take your vitamin pills, if you must ask.

  • Cobalamin injections also exhibit faster absorption into the body and at higher amounts, too. Your doctor will inject 1,000 to 2,000 mcg cobalamin per shot while oral cobalamin is only at 2mcg per pill. If you are suffering from fatigue, you are more likely to enjoy the benefits of energy faster as well.


The nutritional supplements information for vitamin B12 lists down numerous benefits for taking the vitamin in either its oral or injectable form. Cobalamin is used to cure pernicious anemia, lessen the risks for Alzheimer's disease and treat chronic fatigue, to name a few. When combined with thiosulfate, hydroxycobalmin treats cyanide poisoning.

What to Expect in Side Effects

But all is not as rosy as many will want to view Vitamin B12 injections. It is of equal importance to know the possible side effects along with the benefits of these injections so as to set the right expectations. This way, you can also discuss with your doctor if indeed you are suitable for cobalamin injections.

We have to emphasize that side effects from these injections are generally few and far between. Still, we cannot dismiss the possibility that any patient can suffer from these side effects:

  • Upset stomach characterized by mild diarrhea

  • Headaches, nausea and a feeling of being bloated

  • Joint pains

  • Muscle weakness, pain and cramps

  • Rapid heartbeat and palpitations

  • Rapid weight gain


Basically, if you experience anything unusual with your body after the Vitamin B12 injections, you must immediately consult with your doctor. You will want to explore other options since these side effects can become serious health problems.

In fact, your doctor will not administer cobalamin injections when you have underlying medical conditions like Leber's disease, iron and folic deficiencies, liver and kidney illnesses and any medication affecting the bone marrow. Otherwise, you will suffer from graver health complications than what you wanted to seek a cure for in the first place.

Indeed, Vitamin B12 injections are well and good but only under the supervision of your doctor. You can always revert to cobalamin-rich foods and oral cobalamin supplements.

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