Key takeaways
- PEMF therapy uses pulsed magnetic fields to induce small electrical currents in the body's tissues, with no electrodes and nothing implanted.
- Its best-supported benefits are relief of knee osteoarthritis symptoms and helping fractures that won't heal.
- Research is also exploring its role in exercise recovery and inflammation.
- Check with a physician first if you're pregnant, have an implant like a pacemaker, or have epilepsy.
- FDA approval applies to specific prescription bone growth stimulators, not to PEMF in general.
What is PEMF therapy?
PEMF stands for pulsed electromagnetic field. PEMF therapy sends gentle magnetic pulses into the body, either through a mat you lie on or a coil placed over one area, such as a knee or shoulder. It's non-invasive: nothing is implanted, and the field passes through clothing.
PEMF isn't new. PEMF bone healing systems have been FDA-approved since 1979 for fractures that fail to heal.1
How does PEMF therapy work?
PEMF relies on a basic principle of physics: a magnetic field that changes creates a small electric current in anything that conducts electricity, including your body's tissues. The field switches on and off rapidly, and that constant change is what produces the effect. A regular magnet held still can't do this, because its field doesn't change.
Researchers believe these tiny currents act on cells. Lab studies point to effects on calcium channels in cell membranes, on signals linked to inflammation, and on the growth factors bone cells use for repair.2–4 How much of this carries over to people is still being studied.
Field strength, frequency, pulse shape and coil size together decide how strongly and how deeply the field reaches. See the specifications of our PEMF machines.
Benefits of PEMF therapy
May relieve knee osteoarthritis symptoms
Studies of people with knee osteoarthritis found improvements in pain, stiffness and physical function after PEMF sessions compared with placebo. It's the most-researched use of PEMF, studied in multiple meta-analyses.5,6
Supports healing of stubborn fractures
Prescription PEMF bone growth stimulators have been FDA-approved since 1979 for fractures that fail to heal on their own, making this one of PEMF's longest-established medical uses.1
May support exercise recovery
Researchers are exploring PEMF alongside training for its effects on pain, blood flow and recovery.7
May help regulate inflammation
Lab studies show PEMF can influence inflammatory signaling, and some clinical trials report short-term relief after arthroscopy and ACL reconstruction.3
Other conditions
Research is exploring PEMF for many more conditions. See the published studies for each one in ProtoGuide, our free condition-by-condition evidence guide.
Research on PEMF is growing. Most studies so far are small and measured short-term effects, and results depend on the equipment and settings used.
What is a PEMF session like?
You lie on a mat or sit with a coil positioned over the area you're focusing on. Session length and schedule depend on the equipment, so follow the manufacturer's guidance.
Who uses PEMF therapy?
- Clinics: PEMF is used in clinical settings.7
- Athletes: researchers are studying PEMF as part of exercise recovery.7
- Home users: mats and coil systems are available for home use.
- Pets: PEMF mats are also made for animals. See our pet PEMF mats.
Mats, coils and portable units
Whole-body mats
Flat coils built into a mat you lie on. See our PEMF mats.
Targeted coils
Placed over one area, such as a knee, shoulder or back.
Portable units
Small units for a single spot.
PEMF vs similar therapies
Our research
Our equipment was used in a published pilot study on early-stage knee osteoarthritis: 10 patients, open-label, no control group.8 A pilot this size can't prove effectiveness; it sets up a protocol for larger trials.
Read the study summary
Frequently asked questions
Is PEMF therapy safe?
PEMF is non-invasive. Check with your physician before using it, especially if you're pregnant, have a pacemaker, insulin pump or other implant, use medication patches, or have epilepsy.
How long does PEMF therapy take to work?
In knee osteoarthritis trials, changes were typically measured after about three weeks to a month of sessions.9 Results vary by person, equipment and condition.
Is PEMF therapy FDA approved?
Specific prescription bone growth stimulators are, for fractures that fail to heal.1 Approval covers a specific product and use, not PEMF in general. Sentient Light products are general wellness products and are not FDA-approved to treat any condition.
Can I do PEMF therapy at home?
Yes. Home mats and coil systems are widely available. Follow the manufacturer's instructions and talk to your provider if you have a medical condition.
How often should you do PEMF therapy?
There's no established standard; schedules vary between studies and equipment. Follow the manufacturer's guidance.
Does insurance cover PEMF therapy?
Usually only prescription bone growth stimulators. Wellness products are typically paid out of pocket; see our financing options.
Sentient Light products are intended for general wellness use and are not intended to diagnose, treat, cure or prevent any disease. This page is not medical advice.
References
- Blue Cross NC. Electrical Bone Growth Stimulation, medical policy (summarizes FDA approvals of PEMF bone growth stimulators since 1979). bluecrossnc.com
- Funk RHW. Am J Transl Res, 2018;10(5):1260–1272. PubMed 29887943
- Regulation of Inflammatory Responses by Pulsed Electromagnetic Fields. Bioengineering, 2025. doi:10.3390/bioengineering12050474
- Pulsed Electromagnetic Field Stimulation of Bone Healing and Joint Preservation. JAAOS Global Research & Reviews. doi:10.5435/JAAOSGlobal-D-19-00155
- Yang X, et al. Physical Therapy, 2020;100(7):1118–1131. doi:10.1093/ptj/pzaa054
- Viganò M, et al. Cartilage, 2020;13(1 suppl):1749S–1760S. doi:10.1177/1947603520931168
- Ghanbari Ghoshchi S, et al. Front Sports Act Living, 2024. doi:10.3389/fspor.2024.1471087
- Sentient Light knee osteoarthritis pilot study. AJPCR, 2025;18(3). doi:10.22159/ajpcr.2025v18i3.53722
- Chang YS, et al. Medicina, 2026;62(4). doi:10.3390/medicina62040677