Crocker acknowledged the lack of research, but said he still feels confident in the safety of the vaccine.

“It is in a rushed development and testing phase, but all in all, it will likely be a safe vaccine,” he said.

While most of the controversy surrounding vaccinations has focused on administering them to young children, McCarthy said the mercury and aluminum found in the vaccines can have adverse effects regardless of age.

“Heavy metal is heavy metal and it’s going to have some kind of negative effect no matter what your age is,” he said. “It’s a matter of how much you’re exposed to and for how long and it’s something people should keep in mind when they are making an informed decision.”