evidence: A social media post claims that Vitamin K injections are poisonous to babies because of the presence of polysorbate 80 and aluminum in different types of salts. We fact-checked and found this claim to be False. A video shared on Facebook titled, "What’s in the vitamin K shot they give to newborns……..they have poisoning our babies for decades." shares a woman stating, "The main active ingredient is polysorbate 80, and that is … There are strong links to infertility, to autoimmune issues. Polysorbate 80 is banned in a lot of countries, especially in injectables. And that’s the main active ingredient in one of the vitamin K solutions. And the other one — on the vial, it says — contains no more than 100 milligrams per liter, micrograms per liter, of aluminum." [...] No, vitamin K injections are not poisonous due to the presence of polysorbate 80 and aluminum. Both polysorbate 80 and aluminum have been safely used in medical products for many years. Let’s understand the role of these one by one.