evidence: Mostly because someone on the Internet told them to be worried about them, even though vitamin K shots are safe, are free of mercury and any other toxins you might really need to be concerned about, and the dose of synthetic vitamin K your baby gets in the shot will not cause an overdose. Or they might be worried that their baby might get up to 100mcg/L of aluminum with each shot. Of course, since they are only getting 0.5ml with the shot, that only equals about 0.05mcg of aluminum! Although it is an extremely tiny amount, why is it even in there? It is not working as an adjuvant as some would propose (again, vitamin K is not a vaccine), but rather is likely just a byproduct of the manufacturing process. And you can be assured that your baby can quickly, and safely eliminate the small amount from their body. [...] There are isolated case reports of anaphylaxis in newborns to other things, including antibiotics, hepatitis B immunoglobulin, total parenteral nutrition (TPN), and atracurium (used in anesthesia) – but not to vitamin K shots.