Necklaces and accessories claiming to "protect" people from 5G mobile networks have been found to be radioactive.
The Dutch authority for nuclear safety and radiation protection (ANVS) issued a warned about ten products it found gave off harmful ionising radiation.
It urged people not to use the products, which could cause harm with long-term wear.
The products identified included an "Energy Armor" sleeping mask, bracelet and necklace.
A bracelet for children, branded Magnetix Wellness, was also found to be emitting radiation.
Believing in bunk can be hazardous to your health.