Synergistic toxicity
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[It isn't just vaccines, you have fluoride (found in water, cooking utensils, and drugs eg Antacids, SSRI), attaching to aluminium to enter the brain]

See: Fluoride increases lead uptake  Glutathione  Blood brain barrier

[2009 Oct] Aluminum in vaccines increases thimerosal's toxicity by Teresa Binstock

More on Thimerosal & things that synergistically increase the toxicity

"And combination of substances in toxicology can be greater than the sum of its parts. "With lead and mercury, for instance, a  toxicity rating of 1 for each mercury and lead equals not 2, but 60 when combined."---Hal Huggins

We now know that aluminum causes significant abnormalities in neurotubules, microscopic tubes in neurons essential to their function, and these abnormal neurotubules are strongly associated with Alzheimer's disease. Aluminum enters the brain by a number of mechanisms, for example by attaching to glutamate and fluoride. With the widespread use of the excitotoxin glutamate as a food additive and fluoride being added to drinking water supplies, aluminum absorption is common. In addition, injected aluminum can complex with fluoride within the body to produce a compound, fluoroaluminum, that has a number of harmful effects, including brain injury. There is some evidence that fluoride can trigger microglial activation and excitotoxicity, which in combination is particularly injurious to the brain. (Blaylock, RL. Fluoride 2004:37(4);301 -314.) Vaccine Safety Manual  by Neil Z. Miller. (Preface)

A multitude of studies have shown that Aluminium, especially if combined with fluoride, is a powerful brain toxin and that it accumulates in the brain. How Vaccines Can Damage Your Brain: Vaccines, Depression and Neurodegeneration After Age 50: Another Reason to Avoid the Recommended Vaccines By Russell L. Blaylock, M.D.

"We have demonstrated the toxicity of thimerosal by using it to kill neurons in culture. At 50 nanomolar thimerosal the neuron killing capacity/rate is about doubled with the addition of levels of aluminium found in vaccines. The aluminium alone at this level is not demonstrated to be toxic, so it is enhancing the toxicity of the thimerosal. It likely does this by increasing the rate that thimerosal breaks down releasing ethylmercury which is the toxic material" -------Testimony Prof Boyd Haley, University of Kentucky, Chair and Head of Chemistry.......

Another important factor with regard to mercury on the mind, which officials at the CDC, FDA and the professors in the IOM do not consider, is synergistic toxicity - mercury's enhanced effect when other poisons are present. A small dose of mercury that kills 1 in 100 rats and a dose of aluminum that will kill 1 in 100 rats, when combined have a striking effect: all the rats die. Doses of mercury that have a 1 percent mortality will have a 100 percent mortality rate if some aluminum is there. Vaccines contain aluminum. Mercury on the Mind by Donald W. Miller, Jr., MD

"One publication showed that combining mercury and lead both at LD1 levels caused the killing rate to go to 100% or to an LD100 level (12).  An LD1 level is where, due to the low concentrations, the mercury or the lead alone was not very toxic alone (i.e., killed less than 1% of rats exposed when metal were used alone).  The 100% killing, when addition of 1% plus 1% we would expect 2%, represents synergistic toxicity.  Therefore, mixing to non-lethal levels of mercury plus lead gave an extremely toxic mixture!  What this proves is that one cannot define a “safe level of mercury” unless you absolutely know what others toxicants the individual is being exposed to.  The combined toxicity of various materials, such as mercury, Thimerosal, lead, aluminum, formaldehyde, etc., is unknown.  The effects various combinations of these toxicants would have is also not defined except that we know they would be much worse than any one of the toxicants alone.  So how could the ADA take any exception, based on intellectual considerations, to my contention that combinations of Thimerosal and mercury could exacerbate the neurological conditions identified with autism and AD?  Autism and AD have clinical and biological markers that correspond to those observed in patients with toxic mercury exposure.  Why would the ADA take this position?  I personally feel like I have been in a ten-year argument with the town drunk on this issue.  Facts don’t count and data is only valid if it meets the pro-amalgam agenda......The synergistic effects of mercury with many of the toxicants commonly found in our environment make the danger unpredictable and possibly quite severe, especially any mixture containing elemental mercury, organic mercury and other heavy metal toxicants such as aluminum."--Boyd Haley

"A single vaccine given to a six-pound newborn is the equivalent of giving a 180-pound adult 30 vaccinations on the same day.  Include in this the toxic effects of high levels of aluminum and formaldehyde contained in some vaccines, and the synergist toxicity could be increased to unknown levels.  Further, it is very well known that infants do not produce significant levels of bile or have adult renal capacity for several months after birth.  Bilary transport is the major biochemical route by which mercury is removed from the body, and infants cannot do this very well.  They also do not possess the renal (kidney) capacity to remove aluminum. Additionally, mercury is a well-known inhibitor of kidney function."--Boyd Haley Ph.D.

Antibiotics [See: Neomycin (MMR vaccine)]
Studies on the toxicity of mercury to mammalian neurons in culture demonstrate that low nanomolar levels can have lethal effects. Experiments using this system have also demonstrated, in agreement with published literature, that many antibiotics, other heavy metals and chemicals increase the toxicity of mercury and thimerosal (ethyl mercury). Additionally, in this same system the female hormone estrogen decreases thimerosal's toxic effects. In contrast, the male hormone testosterone greatly increases the toxicity. This may explain the 4 to 1 ratio of boys to girls that become autistic and the observation that boys represent the vast majority of the severe cases of autism. "---Boyd Haley, Ph.D. (Testimony Before the House Government Reform Committee)

"Also, it’s not only those children, but those who are on antibiotics are much more susceptible to all types of mercury toxicity, because antibiotics have been shown in experiments with rats to prevent the excretion of mercury. So, it builds up in the bodies of these children......The same thing with diets: milk diets increase the retention of mercury in the bodies of children....the diet, the antibiotics and what we call synergistic toxicity of the exposure to other heavy metals, which is rampant in this country. Interview of Dr. Boyd E. Haley by Teri Small

Both ampicillin and tetracycline have been shown to enhance the neuron-killing effect of thimerosal, perhaps by enhancing its delivery to specific sites....Other heavy metals (Pb, Cd, Zn). Lead plus mercury has an effect 50 times that predicted from simply adding the individual effects.  More on Thimerosal & things that synergistically increase the toxicity