8,655 Studies Reviewed. 86.9% Found Biological Effects. The Evidence is Clear.
All Exposure Types

Magnetic Fields (ELF)

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Extremely Low Frequency (ELF) magnetic fields are produced by the flow of electrical current. They are measured in milligauss (mG) or microtesla (µT). Unlike electric fields, magnetic fields easily penetrate walls and most materials.

Concern Level Thresholds

Based on Building Biology Institute guidelines (mG (milligauss)):

No Concern
< 0.2 mG
Slight Concern
0.2 – 1 mG
Severe Concern
1 – 5 mG
Extreme Concern
> 5 mG

See where common exposures fall on the scale:

Your RF Exposure in ContextA logarithmic scale showing your reading relative to Building Biology concern thresholds and FCC regulatory limits.Your RF Exposure in ContextNo ConcernSlightSevereExtreme0.215FCC Limit 0.0110,000 mG

Showing 487 studies with measured magnetic fields (elf) exposure

DIRECT OBSERVATION OF THE ROTATION IN A CONSTANT MAGNETIC FIELD OF HIGHLY ORGANIZED LAMELLAR STRUCTURES

J. D. CLEMENT-METRAL · 1975

This 1975 research documented how plant chloroplasts (the structures that conduct photosynthesis) physically rotate when exposed to constant magnetic fields. The study observed highly organized cellular structures changing their orientation in response to magnetic field exposure, providing early evidence that biological systems can be mechanically affected by electromagnetic forces.

Effects of low intensity static magnetic field on FTIR spectra and ROS production in SH-SY5Y neuronal-like cells.

Calabrò E et al. · 2013

Italian researchers exposed human brain cells to a static magnetic field at 2.2 millitesla (below current safety limits) for 24 hours and found significant cellular damage. The magnetic field reduced the cells' energy production by 30%, increased harmful reactive oxygen species, and altered the structure of cellular proteins and fats. This demonstrates that even magnetic fields considered 'safe' by regulatory standards can disrupt normal brain cell function.

Extremely low frequency magnetic field induces oxidative stress in mouse cerebellum.

Chu LY et al. · 2011

Researchers exposed mice to 60 Hz magnetic fields (the same frequency as household electricity) for 3 hours and found significant oxidative stress in the cerebellum, the brain region controlling movement and coordination. The magnetic field exposure increased harmful molecules called free radicals while depleting protective antioxidants like vitamin C. This suggests that magnetic fields from power lines and electrical devices may damage brain cells through oxidative stress.

Extremely low frequency magnetic field induces oxidative stress in mouse cerebellum.

Chu LY et al. · 2011

Researchers exposed mice to 60 Hz magnetic fields (the same frequency used in power lines and household electricity) for 3 hours and found significant oxidative stress in the brain's cerebellum. The magnetic field exposure increased harmful molecules that damage cells while decreasing protective antioxidants like vitamin C. This suggests that even short-term exposure to power-frequency magnetic fields can disrupt the brain's natural defense systems against cellular damage.

Effects of acute electromagnetic field exposure and movement restraint on antioxidant system in liver, heart, kidney and plasma of Wistar rats: a preliminary report.

Martínez-Sámano J et al. · 2010

Researchers exposed rats to strong 60 Hz magnetic fields for two hours and found decreased antioxidants in their hearts and blood. These antioxidants normally protect cells from damage, suggesting that even brief exposure to powerful magnetic fields can weaken the body's natural cellular defenses.

Exposure to extremely low frequency magnetic fields enhances locomotor activity via activation of dopamine D1-like receptors in mice.

Shin EJ et al. · 2007

Researchers exposed mice to extremely low frequency magnetic fields (ELF-MF) for one hour daily and found it significantly increased their movement and activity levels. The magnetic field exposure activated specific dopamine receptors in the brain (D1-like receptors), which are involved in movement control and reward pathways. This suggests that ELF magnetic fields can directly alter brain chemistry and behavior through changes in the dopamine system.

Pulsed or continuous electromagnetic field induce p53/p21-mediated apoptotic signaling pathway in mouse spermatogenic cells in vitro and thus may affect male fertility.

Solek P et al. · 2017

Polish researchers exposed mouse sperm cells to electromagnetic fields at 2, 50, and 120 Hz frequencies for two hours. The exposure triggered cell death by damaging DNA and causing oxidative stress, potentially reducing healthy sperm and contributing to male fertility problems.

Coupling of oxidative stress responses to tricarboxylic acid cycle and prostaglandin E2 alterations in Caenorhabditis elegans under extremely low-frequency electromagnetic field

Sun Y, Shi Z, Wang Y, Tang C, Liao Y, Yang C, Cai P · 2018

Researchers exposed tiny worms (C. elegans) to 50-Hz magnetic fields at 3 milliTesla from egg to larval stage and found significant disruptions in cellular energy production and inflammation pathways. The magnetic field exposure caused oxidative stress (cellular damage from free radicals), impaired the worms' energy-producing machinery, and increased inflammatory compounds. This matters because it demonstrates that power-frequency magnetic fields can disrupt fundamental biological processes at the cellular level.

Pharmacological analysis of response latency in the hot plate test following whole-body static magnetic field-exposure in the snail Helix pomatia.

Hernádi L, László JF. · 2014

Researchers exposed snails to a static magnetic field for 30 minutes and tested their pain response using a hot plate test. The magnetic field exposure significantly altered the snails' response time to heat by up to 47%, affecting brain chemicals involved in pain perception including serotonin and opioid systems. This demonstrates that magnetic fields can directly influence nervous system function and pain processing in living organisms.

Chronic exposure to an extremely low-frequency magnetic field induces depression-like behavior and corticosterone secretion without enhancement of the hypothalamic-pituitary-adrenal axis in mice.

Kitaoka K, Kitamura M, Aoi S, Shimizu N, Yoshizaki K. · 2013

Researchers exposed mice to extremely low-frequency magnetic fields (ELF-MF) at 3 milliTesla for 200 hours to study effects on mood and stress hormones. The exposed mice showed depression-like behaviors, increased anxiety, and elevated levels of corticosterone (a stress hormone), suggesting that chronic magnetic field exposure may affect mental health and stress response systems.

Chronic exposure to an extremely low‐frequency magnetic field induces depression‐like behavior and corticosterone secretion without enhancement of the hypothalamic–pituitary–adrenal axis in mice†

Kitaoka K, Kitamura M, Aoi S, Shimizu N, Yoshizaki K. · 2013

Researchers exposed mice to extremely low frequency magnetic fields (ELF-MF) at 3 milliTesla for 200 hours and measured their behavior and stress hormone levels. The exposed mice showed significantly more depression and anxiety-like behaviors, along with elevated levels of the stress hormone corticosterone. This suggests that chronic exposure to strong magnetic fields may affect mental health and stress response systems.

Human cognitive performance in a 3 mT power-line frequency magnetic field.

Corbacio M et al. · 2011

Researchers exposed 99 people to a strong 60 Hz magnetic field (3 mT) for 30 minutes while they performed memory and thinking tests. While the magnetic field didn't clearly impair cognitive performance overall, it did prevent the normal learning improvement that occurs when people repeat the same memory test. This suggests that power-line frequency magnetic fields may interfere with the brain's ability to form new memories through practice.

The effects of prenatal and neonatal exposure to electromagnetic fields on infant rat myocardium

Tayefi H et al. · 2010

Researchers exposed pregnant rats and their newborn pups to magnetic fields (3 mT) for 4 hours daily and examined the heart muscle tissue. They found significant damage including increased cell death, oxidative stress, and structural abnormalities in the heart muscle cells of exposed animals compared to unexposed controls. This suggests that electromagnetic field exposure during pregnancy and early development may harm heart tissue development.

Fifty Hertz electromagnetic field exposure stimulates secretion of beta-amyloid peptide in cultured human neuroglioma.

Del Giudice E et al. · 2007

Italian researchers exposed human brain cells to 50 Hz electromagnetic fields from power lines and found significantly increased production of beta-amyloid proteins, the toxic clumps linked to Alzheimer's disease. This laboratory finding suggests a potential biological mechanism connecting household electricity exposure to Alzheimer's risk.

Immune SystemNo Effects Found

Effects of 21-kHz intermediate frequency magnetic fields on blood properties and immune systems of juvenile rats.

Ushiyama A et al. · 2014

Researchers exposed young rats to 21-kHz magnetic fields (similar to frequencies used in induction heating and some wireless charging) for one hour daily over two weeks to test effects on blood and immune system function. The study found no significant changes in immune cell activity, blood cell counts, or other immune markers, with only a minor phosphorus level change that remained within normal ranges. This suggests that short-term exposure to these intermediate-frequency magnetic fields may not substantially impact immune function in developing animals.

Exposure to extremely low frequency electromagnetic fields alters the behaviour, physiology and stress protein levels of desert locusts.

Wyszkowska J, Shepherd S, Sharkh S, Jackson CW, Newland PL. · 2016

Scientists exposed desert locusts to electromagnetic fields from power lines and appliances, finding reduced walking ability, slower nerve responses, weaker muscle contractions, and increased cellular stress proteins. This demonstrates that everyday electromagnetic field exposure can cause measurable biological effects across multiple body systems.

Effects of 5-HT1 and 5-HT 2 Receptor Agonists on Electromagnetic Field-Induced Analgesia in Rats.

Ozdemir E, Demirkazik A, Taskıran AS, Arslan G. · 2019

Researchers exposed rats to 50 Hz magnetic fields (the same frequency as power lines) for 2 hours daily over 15 days and found the fields produced pain relief (analgesia). They discovered this pain-blocking effect works through serotonin receptors in the brain - the same chemical system involved in mood and sleep. The study shows that extremely low frequency magnetic fields can directly alter brain chemistry and pain perception.

The Static Magnetic Field Remotely Boosts the Efficiency of Doxorubicin through Modulating ROS Behaviors

Hajipour Verdom B, Abdolmaleki P, Behmanesh M. · 2018

Researchers studied how static magnetic fields affect cancer treatment with doxorubicin (a common chemotherapy drug). They found that magnetic fields at 10 millitesla enhanced the drug's cancer-killing effects by increasing harmful molecules called reactive oxygen species (ROS) in cancer cells. This could potentially allow doctors to use lower doses of chemotherapy while maintaining effectiveness, reducing side effects for patients.

Cytotoxic effects of moderate static magnetic field exposure on human periphery blood mononuclear cells are influenced by Val16Ala-MnSOD gene polymorphism.

Dornelles EB et al. · 2017

Researchers exposed human blood cells to static magnetic fields for up to 6 hours, finding that people with certain genetic variations experienced significantly more cell death and damage. This suggests genetic differences may make some individuals more vulnerable to magnetic field exposure than others.

Neuroprotective effect of weak static magnetic fields in primary neuronal cultures.

Ben Yakir-Blumkin M, Loboda Y, Schächter L, Finberg JP. · 2014

Researchers exposed rat brain neurons to weak static magnetic fields (50 gauss) for seven days and found these fields provided significant protection against cell death. The magnetic field exposure reduced neuron death by 57% when cells were exposed to a toxic chemical, and decreased multiple markers of cellular damage by 40-80%. This suggests static magnetic fields might influence brain cell survival through changes in calcium channels.

Fifty-Hertz electromagnetic fields facilitate the induction of rat bone mesenchymal stromal cells to differentiate into functional neurons

Bai WF, Xu WC, Feng Y, Huang H, Li XP, Deng CY, Zhang MS. · 2013

Chinese researchers exposed stem cells from rat bone marrow to 50 Hz magnetic fields (the same frequency as power lines) for one hour daily over 12 days. The electromagnetic field exposure helped these stem cells transform into functional brain neurons that could form connections and transmit electrical signals. This suggests that power-frequency magnetic fields might have therapeutic potential for treating nervous system diseases through stem cell therapy.