Once you start looking into PEMF, you run into two very different worlds of “frequency” information at the same time: peer-reviewed research measuring specific Hz ranges against specific outcomes, and centuries-old traditions (Solfeggio tones, the Schumann resonance) that treat frequency as symbolically or energetically significant. Both show up constantly in PEMF marketing, usually blended together without a label. We think that’s a disservice — so here’s each, kept separate, with sources.
What clinical research has actually measured
Bone healing: ~1.5–75 Hz, with 15 Hz as the clinical standard
This is the best-established range in the literature, for the obvious reason that it’s the oldest and most-studied application. A 2025 review of bone and cartilage response to PEMF found effective stimulation broadly across roughly 1.5–75 Hz, and most FDA-cleared bone growth stimulators specifically use 15 Hz. Intensity matters here too — research generally places bone-healing protocols in a medium intensity range (roughly 15–30 Gauss), notably higher than the pain/inflammation range below.
Pain and inflammation: lower intensity, broader frequency band
The pain research is the deepest evidence base after bone healing. A 2013 Cochrane review found moderate-quality evidence for reduced pain and improved function in knee osteoarthritis. A 2015 meta-analysis in Clinical Rheumatology, pooling 15 trials and over 1,000 patients, found a statistically significant pain-score reduction versus sham treatment. A 2019 randomized trial published in PLOS One found a 25% greater reduction in fibromyalgia pain intensity compared to sham. More recent systematic reviews have specifically examined soft tissue injuries and non-specific low back pain. Across this body of work, lower intensity (roughly 1–10 Gauss) shows up more often than the higher intensities used for bone, and the proposed mechanism is downregulation of inflammatory signaling (the NF-κB and MAPK pathways specifically) rather than a single “magic” frequency.
Sleep and relaxation: 1–4 Hz (preliminary)
This is the least mature area of the three. Some research has looked at very low frequencies — roughly 1–3 Hz, in the same range as delta brainwave activity (0.5–4 Hz, associated with deep sleep and cellular recovery) — for sleep-related outcomes. We want to be honest that this is a thinner, more preliminary evidence base than bone healing or pain, closer to “promising and worth more research” than “established.”
Muscle relaxation: ~15–30 Hz
A secondary thread in the literature places muscle-relaxation-focused protocols in roughly the same mid-range used for bone healing, which tracks with the broader pattern that mid frequencies (roughly 10–30 Hz) tend to dominate musculoskeletal applications generally, while the lowest frequencies (under ~4 Hz) cluster around nervous-system/sleep-adjacent research instead.
What’s tradition, not clinical research
Separately from all of the above, the wellness and sound-healing communities have their own long-standing frequency frameworks — most commonly the Solfeggio frequencies (a set of tones, like 396 Hz or 528 Hz, tied to a modern reconstruction of medieval Gregorian chant scales) and the Schumann resonance (Earth’s own electromagnetic resonance, centered around 7.83 Hz, which is a real, measurable geophysical phenomenon, even though the specific health claims built around it go well beyond what’s been measured). These frameworks are meaningful to a lot of people, and there’s nothing wrong with exploring them — but they come from tradition and numerology, not the clinical literature above, and we’re not going to blur that line by presenting them as if a study measured them. If you’re drawn to that side of frequency work, the SG102’s full range covers it too; just know what you’re standing on when you use it.
How this maps onto the SG102
The SG102 is fully adjustable across 1 Hz–150 kHz with independent duty-cycle (intensity) control from 0–100% on three parallel channels — which means the entire researched range above (roughly 1–75 Hz for the clinical literature, and up through the low kHz range if you want to explore the traditional frequency systems) is available to experiment with on one unit, alongside room to go well beyond it if you’re doing your own research.
Before you start
A few real, sourced contraindications worth taking seriously: anyone with a pacemaker, defibrillator, insulin pump, cochlear implant, or other implanted electronic device should not use PEMF due to interference risk. It’s considered an absolute contraindication during pregnancy (insufficient safety data on fetal development). And if you have epilepsy or another seizure disorder, active cancer, or a bleeding disorder, talk to a specialist before using any electromagnetic device — magnetic stimulation carries a theoretical effect on seizure threshold that’s worth a real conversation with your doctor, not a guess.
None of this is medical advice, and none of it is a claim that the SG102 or any Sacred Geometry product diagnoses, treats, cures, or prevents any disease. It’s a summary of where the actual research stands, so you can make an informed decision about your own experimentation.
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