Question: What about all those other ingredients that I hear about that they put in vaccines?
The concerns about specific vaccine ingredients are common because some vaccine opponents are trying to scare people. Anything in excess is toxic, extremely tiny amounts of relatively toxic things are not harmful.
Mercury - see above (thimerosol)
Aluminum - Alum is not the same as aluminum, it is a salt that is added as an adjuvant. Vaccines contain antigens (either whole viruses or bacteria or parts of them) that we create a memory response against, as well as adjuvants, which are like a 'danger signal' for our immune system that pushes the immune response in specific directions.
Formaldehyde is used to kill viruses to prepare vaccines. It is mostly removed, but trace amounts remain in some vaccines. These tiny amounts are not harmful, even to newborn infants. In fact, we all have formaldehyde in our bodies because we need it to make DNA and amino acids.
Antibiotics are also added to some vaccines in tiny amounts to prevent bacteria from contaminating the vaccines after they are made.
Human serum albumin is added as a stabilizer. It is derived from human blood. The only reason I can think of to oppose it is the chance that it might be contaminated with a blood-borne pathogen, or if you are religiously opposed to blood transfusions. All blood is screened carefully before it is used to reduce the risk of blood-borne infections.
Gelatin is also a stabilizer. Some people might be allergic to gelatin or to egg proteins (some vaccines come from viruses grown in eggs). People with these allergies shouldn't get vaccines made from eggs or that have gelatin added.
Question: What if I just don’t feel right about vaccinating my children?