Aluminum adjuvants in vaccines and the newborn vitamin K shot are also significant sources of early exposure. The package insert for Pfizer’s vitamin K formulation warns that the product “contains aluminum that may be toxic,” and it also notes that “premature neonates are particularly at risk,” yet it is standard practice to administer vitamin K shots to preterm infants. Young children go on to receive multiple aluminum-containing vaccines in their first three years, and more as adolescents. A two-month-old infant may receive up to 1,225 micrograms of aluminum from the vaccines administered at a single well-baby visit and a cumulative 4,925 micrograms by 18 months of age. Regulators have never properly assessed these astronomical levels of aluminum for safety. Co-exposure to aluminum and mercury (still present in influenza vaccines) makes matters synergistically worse.