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What are the Side Effects of B12 Shots?

B12 isn’t a new noun to many dieters. But if you are an amateur to this, perhaps it can be equated to the gasoline in cars. Without gasoline, your car can’t get anywhere so does the body.  In other words, B12 is a supplement that will supply the body with energy thus aiding it to function purposefully.

A diet that has eggs, fish, and meat and dairy products are enough to supply your body with B12 vitamins, however; the same diet might be carrying toxic substances. B12 is a common problem and the majority solves it by administering the B12 shot. On the other hand, some do opt for VeganSafe B12 which contains 2 active form of B12; adenosylcobalamin and methylcobalamin which are equally effective as B12 shot.

What is B12 Shot?

B12 is a supplement taken to prevent Vitamin B12 deficiency a condition characterized by low levels of vitamin B12 levels in the blood. B12 shot is an injection but there are oral supplements too. If taken by mouth, B12 helps to treat pernicious anemia. Also, supplements taken by mouth help to improve memory, boost mood, energy, and concertation. For those who can’t digest this supplement because of one reason or the other, the best alternative is the B12 shot.

Why B12 shot?

Mood disorders, depression, fatigue, high homocysteine levels, low blood pressure and anemia are symptoms associated with vitamin B12 deficiency. So, the B12 shot does address these symptoms. Besides, it helps to trigger the energy levels, to drive cognitive function or as a therapy for depression. For some reasons, researchers are still figuring out if this shot can be administered as a therapy for bipolar disorder, autism, and shaky leg syndrome.

Getting the B12shot

It’s recommended to liars with the doctor of any alcohol consumption, any supplements you are using, allergies etc. prior getting the B12 shot.

Side Effects

The common side effects associated with excessive intake of vitamins include diarrhea, vomiting, nausea, and flushing. From the two common B12 shots discussed above, the following are side affects you are likely to experience.


Cyanocobalamin is a synthetic version of vitamin B12 normally used in supplements so does it in B12 shots. Minor side effects that come with this supplement include; a little bit of diarrhea and swelling.

Major side effects include; Irregular or fast heartbeat, shortness of breath, extreme thirst, exhaustion, headache, muscle weakness, and reddening of the skin. Chest pain and difficulty in breathing are rare. However, if you happen to encounter any of the major side effects, consult the doctor.


This B12 form is the one found in food but once delivered as a B12 shot swelling, itching, diarrhea, and soreness at the site of injection are minor side effects.

Major side effects are a weakness, irregular heartbeat, and muscle cramping. Apart from these, if you encounter difficulty in breathing, slurred speech, pains in the chest, weakness on one of the body, and sudden change in vision, consult the doctor.

Have you been taking B12 shots? What is your view on them?