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Also known as cobalamin, the Vitamin B12 keeps the nerve cells and red blood cells of the human body afresh and immune to a variety of diseases. It plays its conspicuous role in forming the DNA in the human body.
Vitamin B12 is found profusely in the protein enriched foods. Vitamin B12 is produced inside the abdomen by hydrochloric acid during the digestion process. In other words hydrochloric acid makes Vitamin B12 through the digestive system which gets absorbed into our intestinal tract efficiently.

Sources of Vitamin B12?

Following are the major sources of Vitamin B12.

• Fish.
• Meat.
• Poultry.
• Eggs.
• Milk.
• Milk products.
• Mollusks.
• Liver.
• Beef.
• Trout.
• Salmon.
• Beef.
• Cheeseburger.
• Taco.
• Yogurt.
• Haddock.
• Clams.
• Tuna.
• Pork.
• Chicken.

People, being health conscious, should consume the food items containing maximum amount of protein, vitamins, minerals, calcium, iron and carbohydrates. It has been observed that people, passing through their routine stressful life, become careless consuming whatever they like the most and find easily around them. Such carelessness on the part of innumerable people ogten results into deficiency of  
Vitamin B12. Deficiency or scarcity of Vitamin B12 causes in the human body different types of problems such as anemia, fatigue and restlessness. If such complications arising out of deficient Vitamin B12 are not taken seriously at their rudimentary stage, they take serious form with the passage of time, becoming a chronic health problem for the patient.

Doctors and all the health experts are left, following such health complications becoming chronic, with no any other option except administering the intramuscular injections into the body of patient to replenish the scantiness of Vitamin 12. The Vitamin B12 injections are also known as cobalamin or subcutaneous injections. The Vitamin B12 injections, though are very effective, they sometimes cause pain over the body of the person. Those who suffer from anemia are required to be administered the Vitamin 12 injections till the last of their breath. Such compulsion of being administered the Vitamin B12 injections throughout their life causes a grave anxiety to the patients suffering from anemia. Vitamin B12 injections are administered deep into the muscle of patient.

Common Side Effects

The Vitamin B12 injections are not perfectly immune to the side effects as some signs emerging in the patient substantiate its causing side effects to the patient. Following are the symptoms confirming the side effects of Vitamin B12 injections.

• Mild diarrhea.
• Upset stomach.
• Nausea.
• Pain or Inflammation over the injected part of body.
• Patient feels swollen by entire body.
• Headache.
• Joint pain.

Rare Side Effects

Though the above mentioned side effects are common symptoms of Vitamin B12 injections to occur in the patient’s body, few symptoms are rare to appear and are needed to be revealed to the doctor by the parient in order to prevent it from exacerbating further. 

• A rapid heartbeat.
• Heart palpitations.
• Chest pain.
• Suffocation.
• Gaining the weight.
• Weakness.
• Muscle pain and cramps.
• Feeling excessively thirsty.
• Frequent urination.
• Leg aches.
• Obfuscation.
• Perspiration.
• Numbness.
• Dizziness.
• Tingling sensation.
• Breathing problem.
• Difficulty in eating, swallowing and drinking.
• Fatigue and shortness of breath even following minor loabor.
• Sudden coughing.
• Body becoming red.
• Continuous pain in one leg.
• Swelling in one leg.
• Complexion becoming fatigued, dull and reddish.
• Hives.
• Itching.
• Skin rash.

What You Should Be Aware Of

• Though all the patients can go for Vitamin B12 injections, what they are required to be too aware of,  are some additional complications, which the patients do not consider necessary to reveal to the doctor. You should reveal to your doctor, who is likely to administer you the Vitamin B12 injections, the following diseases or problems which you must be suffering from.
• Leber’s Disease.
• Kidney problem.
• Liver disease.
• Infection.
• Iron deficiency.
• Folic acid deficiency.
• Allergy to cobalt or vitamin, dye, food or preservatives.

Apart from divulging to the doctor your remaining health related complications, you should share the informations on medicines to have already been prescribed to you by other doctors for any other health or physique related complications. The doctor, before administering you the Vitamin B12 injections, looks into the composition of drugs and analyzes its reaction on getting mixed with Vitamin B12 injections. 
 
Share with doctor whatever you take regularly including herbal products, vitamins, minerals and nutritional supplements so that your doctor can help you recover yourself from current problem.