http://www.vitaletherapeutics.org/vtlmntox.htm
Looking at the sizes of various ions of elements in the periodic table suggests that barium interferes with the potassium needed at proper levels to prevent cramping and heart attacks. Sodium and many radioactive elements interfere with the calcium needed for strong bones and competent humoral (antibody-mediated) immunity. Cancer patients mobilize bone to elevate blood calcium, perhaps in vain attempts to stimulate humoral immunity that works only with an unpoisoned and well-nourished vitaletheine modulator pathway. Nickel is larger than magnesium in bone and aluminum is smaller, so co-precipitation of these toxins can produce weak bones and joints while poisoning immunity and energy.