A static magnetic field is a type of electromagnetic field
Not all magnetic fields are bad for human health, of course. The earth's magnetic field exists all the time and does no harm to the human body; Conversely, if the geomagnetic field were to disappear now, the body would have to make some changes to adjust.
In fact, the human body is constantly generating magnetic fields. On a larger scale, you know, nerves transmit signals by electrical currents, and that creates magnetic fields.
Thus, static magnetic fields, like the earth's magnetic field, do not harm human health. The magnetic field generated by Flexible Magnet is static magnetic field. Therefore, when you use the Flexible Magnet, you can safely use it.