Calvit 12 Injection injection is a prescription medicine. It is a combination of nutritional supplements that are prescribed to treat vitamin and mineral deficiencies. It also ensures the proper growth and functioning of the body. Calvit 12 Injection is administered under the supervision of a healthcare professional. You are not advised to self administer this injection. Inform your doctor if you have any known allergy from this medication. You may experience symptoms of injection site reactions such as redness, swelling and pain. Usually they go away with time but if these symptoms persist for a longer duration, please consult your doctor. Inform your doctor if you are suffering from any disease or are taking any medicines.