I think really strong magnetic fields can affect the iron in the blood somehow. And some chemical reactions can be affected too, since they have to with ions and electron transfer across cell membranes. But I can't recall what they effects are or how pronounced they are. MRIs use powerful magnets, and they are a common diagnostic tool. So magnetic fields can't be that bad for us. Otherwise we'd all be dying from exposure to Earth's magnetic field.

Magnets that can suspend hundreds of pounds in the air are seriously strong. Malfunctions that I was worried about were, if the magnetic suspension failed, or the poles reversed directions from repel to attract and someone's toes were underneith the bed. Or if there was a non-uniform magnetic field, or a cycling field that caused the bed to spin at a high rate. That could be dangerous.