Vaccines are comprised of 3 components:
1.) The Pathogen: (Virus or Bacteria) you want to create immunity for. It is usually a dead form of the pathogen or a piece of the pathogen that your immune system can create anti-bodies for. Some vaccines contain a live form of the virus, such as the influenza vaccine and the MMR (Measles, Mumps and Rubella) vaccine.
2.) Adjuvants: A form of aluminum is most commonly used. This increases the reaction of the immune system and can create rashes or pain at the point of injection. Aluminum is known to be a neurotoxin, and when injected directly into the bloodstream, it can cause many other side effects.
3.) Preservatives: This allows the vaccines to be mass produced and obviously, increases the shelf life. Some of the preservatives used are Thimerosal (a from of mercury), Formaldehyde, Phenol, 2-Phenoxyethanol, Benzethonium Chloride, Polysorbate 80 and others.
I am not telling you what to do, just trying to help educate people so they can make an informed decision.
Please educate yourself! A good place to start is by reading the package inserts that come in the box. These will contain a full list of ingredients and potential side effects. You can also visit learntherisk.org