The evidence regulators are still catching up with.
The official position is that wireless radiation within safety limits is safe. That position rests on limits designed in the 1990s to stop body tissue heating up. A large and growing body of peer-reviewed research points to biological effects at levels far below those limits. The most significant now comes from a review commissioned by the World Health Organization itself.
This page sets out some of the current evidence, with links to every study, so you can read it yourself.
For the basics of what EMF is and where it comes from, start with What Is EMF?
What the WHO’s own reviews found
2011: “Possibly carcinogenic”. The WHO’s International Agency for Research on Cancer classified radiofrequency electromagnetic fields as “possibly carcinogenic to humans” (Group 2B). The classification was based largely on studies of heavy mobile phone users. IARC Monograph 102
2025: High-certainty evidence of cancer in animals. A systematic review commissioned by the WHO looked at experimental animal studies of RF exposure. It found high-certainty evidence that RF exposure increased gliomas (brain tumours) and heart schwannomas in animals. It found moderate-certainty evidence for rare tumours of the adrenal gland and liver, and for lymphomas. Mevissen et al, Environment International, 2025
Safety limits were built for heating, not biology
Australia (ARPANSA), the UK (UKHSA) and most countries base their limits on guidelines from the International Commission on Non-Ionizing Radiation Protection (ICNIRP). These guidelines were first set in 1998 and updated in 2020. They are designed mainly to prevent heating of body tissue. They aren’t designed to account for biological effects that happen without heating.
In 2022, the International Commission on the Biological Effects of Electromagnetic Fields (ICBE-EMF), a group of scientists and doctors, published a peer-reviewed paper arguing that the scientific evidence invalidates the health assumptions behind the ICNIRP and US limits. ICBE-EMF, Environmental Health, 2022
A US federal court agreed the limits hadn’t been justified. In August 2021, the US Court of Appeals for the D.C. Circuit ruled that the Federal Communications Commission (FCC) had failed to explain why its 1996 limits protect against harms other than cancer. The court ordered the FCC to address the effects on children, long-term exposure and the environment. Wireless Estimator
Cancer: the animal studies
- US National Toxicology Program (2018). A US$30 million study exposed rats to mobile phone radiation for 2 years. The NTP found “clear evidence” of heart schwannomas and “some evidence” of brain gliomas in male rats. Melnick, Environmental Research, 2019
- Ramazzini Institute (2018). An Italian lifetime study of 2,448 rats used far weaker, mobile-tower-level exposure. It found an increase in the same rare heart tumour in the highest-exposed male rats. Falcioni et al, Environmental Research, 2018
Two independent labs, using different exposure levels, found the same rare tumour type. This finding underpins the WHO-commissioned review’s high-certainty rating.
Cancer: the human studies
- Interphone re-analysis (2017). A bias-adjusted re-analysis of Canadian data found the heaviest mobile phone users had about 2 times the glioma risk of light users. Momoli et al, American Journal of Epidemiology, 2017
- Long-term use (2009). A meta-analysis found 10 or more years of mobile phone use was associated with higher glioma risk on the side of the head where the phone was held. Hardell et al, Pathophysiology, 2009
Biological effects below the safety limits
- Calcium channels. Professor Martin Pall has shown how EMF can activate voltage-gated calcium channels in cell membranes at levels far below heating thresholds. It’s one of the most cited mechanisms in the field. Pall, Reviews on Environmental Health, 2021
- Oxidative stress. A review linked RF exposure from wireless technology with oxidative stress, a driver of cell damage. Dasdag and Akdag, Journal of Chemical Neuroanatomy, 2016
- Blood-brain barrier. Animal studies have reported changes in the blood-brain barrier after non-thermal exposure. Nittby et al, Electromagnetic Biology and Medicine, 2008 [VERIFY DOI]
- Heart rate variability. A double-blind crossover study found changes in HRV in healthy young adults during real mobile phone signal exposure. Wallace et al, Environmental Research, 2020 [VERIFY DOI]
- Younger nervous systems. A meta-analysis found younger users’ nervous systems respond more strongly to mobile phone exposure. Geronikolou et al, 2020
- Sleep. A randomised study found evening exposure to 3G mobile phone signals changed brain activity during sleep. Lowden et al, Journal of Sleep Research, 2019
- Reproductive health. A 2023 review reported DNA damage, oxidative stress and reduced sperm quality in laboratory and animal studies. Kaur et al, Cells, 2023
- The wider body of evidence. The BioInitiative Report brings together thousands of studies on the biological effects of EMF and concludes that current limits don’t protect public health. bioinitiative.org
Governments are reopening the question
- January 2026. The US Department of Health and Human Services announced a new study of mobile phone radiation and health. The FDA removed web pages carrying its older conclusions on mobile phone safety while the study proceeds. HealthDay
- September 2026. HHS issued a public request for evidence on the health effects of wireless radiation. It covers phones, Wi-Fi, 5G, smart meters and wearables, with a focus on children, pregnant women and people with implanted devices. HHS
Our view
The question is no longer whether wireless radiation has biological effects. It’s how much those effects matter, and for whom. Safety limits built around heating don’t answer that question. The research, the WHO’s own reviews and the governments now reopening the issue all say the same thing: this isn’t settled.
We don’t think you need to wait for the final word to act. Reduce the exposure you can control, without giving up the technology you rely on. Read the Blushield Pilot Study to see where Blushield fits.
If you have health concerns, please talk to a qualified health professional.