I can name several substances that may be found in Vaccines that in large doses can cause illness or death, among them are Formaldehyde,and Hydrochloric Acid (HCl). These are certainly bad if ingested in sufficient quantities. But they are also found naturally in the human body as part of body processes eg breakdown of food in the stomach by acid (Gastric Acid contains HCl). Formaldehyde is created and used within certain metabolic processes.
Others things found in vaccines include Aluminium salts as adjuvants, that is they are used in strengthening and lengthening the immune response to the vaccine. Aluminium salts appear to slow down the release of the active ingredient from the vaccine once it is injected, and stimulate the immune system to respond to the vaccine. They also absorb protein well, and stop the proteins in the vaccine sticking to the walls of a container during storage.
Antibiotics used to stop Bacteria growing in the vaccine production process. Some of these are neomycin, streptomycin, polymyxin b., gentamicin and kanamycin. No penicillin or similar commonly allergy reaction causing ones are used. If someone is allergic to any of the ones used however, they should discuss the vaccines with their doctors to ensure no ill effects. The amounts present in prepared vaccines are very small or undetectable.
Egg Albumin as it is used as a growing medium for some vaccines.
Sodium Hydroxide is also used in the production of vaccines in it's role as a acidity modifier to create the correct pH balance, in doing so it is consumed leaving water & Sodium Chloride as a byproduct ie salt. None is left as Sodium Hydroxide. The same result happens for Hydrochloric Acid.
Thiomersal (an ethylmercury based preservative) though it is not like methylmercury compounds that accumulate in the body.. It is in very small amounts in a vaccine. Thiomersal is not used in Australia but is included here in this list as people may receive vaccinations elsewhere in the World.
Vaccines can also contain gelatine, Human Serum Albumin (a stabiliser), Recombinant human serum albumin (a stabiliser) Sorbitol (which the body produces anyway), Manniitol (similar to Sorbitol), Sucrose, Lactose, Glycerol and a large number of other compounds.
But of all these products the amounts found in vaccines are so small as to be harmless or have no effect to our bodies. We either break them down through natural processes, they are used by the body as part of it's metabolic pathways as they already occur in our bodies, or we excrete them via our normal elimination processes. None are in quantities that could be or are Toxic but some people could be very allergic to some eg eggs.
To read more on what can be included or used in vaccine production worldwide I include some easy to read sources:
For a list of all the various components used in Vaccine production in Australia is the following:
I tried to get some sort of understanding about Toxic Load but what I found was that they consider everything modern has some burden it puts on the functioning of the human body, ie the chemicals in everything burden the body and need to be eliminated for the body to function correctly.
I think they believe that somehow they lived healthier and longer lives before modern times and they need to return to those simpler things to be healthier and live longer. Unfortunately this is not really true, before modern medicine populations had vastly higher child mortality rates caused by diseases we now vaccinate against, most adults and children had very poor life spans dying because of infections that could not be controlled, from the results of poor diets, poor hygiene, lack of primary healthcare, damage from previous illnesses eg Childhood Scarlet Fever infections, Typhoid, Cholera, Malaria, Dysentery, Cancer of myriad types, Sexually Transmitted diseases, measles, mumps, congenital/genetic disorders eg Haemophilia and the list goes on.
While I agree that eating good quality food in appropriate portions, having good social activity, exercise, mental relaxation, a belief system (whatever that may be including science), and drinking good clean water are important for our good health, it is also important to understand these do not in themselves, without good medical and dental health interventions & preventative measures, lead to long and healthy lives for ourselves and our children.