I would say that this list is difficult because there are specifics attached to lots of materials, and there are also use case issues to cover. For example, PLA (that stuff you can print with) is also generally considered “biosafe”, but it also dissolves in the body. Teflon has other issues, and gold both physically abrades as well as “dissolves” in the body (bodily fluids basically etch it away slowly).
To give you an idea of all the different potential issues, check out the ISO10993 in all it’s parts… that will give you an idea just how complex “safe in the human body” can get.