What PEMF therapy actually is — and what it isn't

They differ by orders of magnitude. A brand quoting "0.5 milligauss" is not describing therapeutic output — that's almost certainly a stray-EMF safety figure presented as if it were field strength.

Field strength falls off fast with distance. A number measured at the coil is far higher than the same mat measured at the surface, where your body actually is. If a brand doesn't say where they measured, the number tells you nothing.

Output varies with both. On most mats the field also changes with how many cores are active at once, because the power supply is shared between them. A single peak number hides all of this. Ask for a table, not a headline.

More cores means wider coverage — more of your body inside the field. It does not automatically mean a stronger field; sharing one power supply across more coils generally means less intensity per coil. Wider and gentler, or narrower and stronger, is a genuine trade-off. Choose based on whether your issue is one spot or all over.

A sine wave rises and falls smoothly. Square-wave devices switch abruptly, which some people find sharper. Neither is dangerous at these intensities, but it changes how a session feels — worth knowing if you're sensitive.

No consumer PEMF wellness mat is FDA approved or FDA cleared. The only cleared PEMF devices are prescription bone growth stimulators. Wellness mats operate under FDA's general wellness policy, which permits general wellbeing claims and prohibits disease claims. A brand claiming clearance — or using "medical grade" to imply it — is telling you something about how they handle facts.

Many people notice relaxation from a session immediately, largely because of the infrared heat. Anything cumulative takes consistent use over weeks. Set a six-week checkpoint, measure something at the start, and be prepared for the answer to be "not for me" — that's what the 60-day return window is for.

The mat has an auto shut-off, and there are low-frequency programs designed for extended use. Check the manual for your model rather than assuming — and don't run an energising program overnight.

PEMF does — a magnetic field passes through fabric. Infrared heat works better with less between you and the surface. Red light needs direct skin contact and will not pass through clothing.

No, though they overlap. A heating pad gives you heat only. A PEMF mat with infrared gives you heat plus a pulsed magnetic field. If all you want is warmth, a heating pad is far cheaper and we'd rather tell you that.

Yes — one at a time. Check the contraindications in section 04 for everyone who plans to use it, and check with a clinician before using it with children or anyone managing a health condition.

Yes. Grooni is partnered with Truemed, so eligible customers can pay with pre-tax funds at checkout — typically saving around 30%. See how it works.

Every Grooni mat comes with a 60-day money-back window and a 2-year warranty. Given what the evidence does and doesn't show, we think a real trial period matters more than a confident promise.