PCMag editors select and review products independently. If you buy through affiliate links, we may earn commissions, which help support our testing.

Anti-5G Pendant Actually Causes Harmful Radiation, Dutch Authorities Warn

The Netherlands' Authority for Nuclear Safety and Radiation Protection is warning the public to stay away from 10 products it tested for releasing ionizing radiation.

 & Michael Kan Principal Reporter

Our team tests, rates, and reviews more than 1,500 products each year to help you make better buying decisions and get more from technology.

Our Expert
LOOK INSIDE PC LABS HOW WE TEST
65 EXPERTS
43 YEARS
41,500+ REVIEWS

A pendant that claims it can block out 5G radiation actually causes harmful radiation, according to authorities in the Netherlands. 

The warning comes from the country’s Authority for Nuclear Safety and Radiation Protection (ANVS). On Thursday, it issued a consumer alert about 10 products that claim to offer radiation-shielding and “negative ion” properties. All 10 products actually emit ionizing radiation, ANVS says, citing a recent study from the National Institute for Public Health and the Environment. 

A listing for a negative ion product
One of the negative ion products that was tested.

“Only low levels of radiation have been measured on these specific products. However, someone who wears a product of this kind for a prolonged period (a year, 24 hours a day) could expose themselves to a level of radiation that exceeds the stringent limit for skin exposure that applies in the Netherlands,” the ANVS says.

Ionizing radiation is dangerous because it can destabilize the electrons from your atoms, causing them to detach. The effect can lead to cell damage, and long-term health problems such as developing cancer, according to the US Environmental Protection Agency.

Nevertheless, merchants have been selling negative ion products for years now, claiming the low-level radiation can strengthen the immune system and boost energy levels.

Dutch authorities are urging consumers to avoid wearing the 10 consumer products, including a so-called “Quantum Pendant” you can find on Amazon, eBay, and Etsy for around $10. 

A listing on eBay for the Quantum Pendant.
A listing on eBay for the Quantum Pendant.

The listings on eBay and Etsy also claim the pendant can absorb 5G radiation or block out electromagnetic radiation from cell phones, radio, and GPS.

Still, there's no evidence 5G is a harm to your health. The technology relies on existing cellular technologies. For example, AT&T's low-band 5G actually taps cellular frequencies that've been around since 1983. Meanwhile, T-Mobile's low-band 5G uses UHF TV bands, which have been in use for over half a century.  

The other products Dutch authorities tested included bracelets, a necklace, and a sleep mask that offer negative ion properties. “The ANVS has informed all known vendors of these products in the Netherlands that their sale is prohibited and that they must stop trading in these products immediately,” the agency adds. 

Washington State Department of Health

US state authorities have also been warning consumers about the danger of negative ion products. The Utah Department of Environmental Quality points out the same products can emit harmful radiation by incorporating uranium or thorium. 

“We found unacceptable levels of radioactive material in some of the products tested,” the website for the Washington State Department of Health adds. “Although being exposed to these items for short periods of time do not pose an immediate health threat, we want to make sure people are not exposed to unnecessary radiation.”

About Our Expert

Michael Kan

Michael Kan

Principal Reporter

My Experience

I've been a journalist for over 15 years. I got my start as a schools and cities reporter in Kansas City and joined PCMag in 2017, where I cover satellite internet services, cybersecurity, PC hardware, and more. I'm currently based in San Francisco, but previously spent over five years in China, covering the country's technology sector.

Since 2020, I've covered the launch and explosive growth of SpaceX's Starlink satellite internet service, writing 600+ stories on availability and feature launches, but also the regulatory battles over the expansion of satellite constellations, fights with rival providers like AST SpaceMobile and Amazon, and the effort to expand into satellite-based mobile service. I've combed through FCC filings for the latest news and driven to remote corners of California to test Starlink's cellular service.

I also cover cyber threats, from ransomware gangs to the emergence of AI-based malware. In 2024 and 2025, the FTC forced Avast to pay consumers $16.5 million for secretly harvesting and selling their personal information to third-party clients, as revealed in my joint investigation with Motherboard.

I also cover the PC graphics card market. Pandemic-era shortages led me to camp out in front of a Best Buy to get an RTX 3000. I'm now following how the AI-driven memory shortage is impacting the entire consumer electronics market. I'm always eager to learn more, so please jump in the comments with feedback and send me tips.

The Best Tech I've Had:

  • My first video game console: a Nintendo Famicom
  • I loved my Sega Saturn despite PlayStation's popularity.
  • The iPod Video I received as a gift in college
  • Xbox 360 FTW
  • The Galaxy Nexus was the first smartphone I was proud to own.
  • The PC desktop I built in 2013, which still works to this day.

Read full bio