Frequency Specific Microcurrent, What the Term Actually Means
Medically reviewed by
4 independent reviewers
Andrew Conrad Barile, PT, DPT
Doctor of Physical Therapy (DPT) | Licensed Physical Therapist (PT) | CEO and Founder, Xtreem Pulse LLC
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Dr. Andrew Conrad Barile is a Doctor of Physical Therapy and the CEO and Founder of Xtreem Pulse LLC, the engineering company behind PureLift. He earned his Doctorate in Physical Therapy from Daemen College and is a licensed physical therapist.
He brings over two decades of clinical and entrepreneurial experience across physical therapy, craniosacral therapy and medical device innovation, built on a working knowledge of human anatomy and muscle physiology.
For PureLift LAB he reviews how current is delivered across all ten levels, from sub-sensory nanocurrent and skin-level microcurrent to motor-level EMS, and how the Infuse pass fits into the same ten-minute routine.
Bertica M. Rubio, M.D.
Board-Certified Physician, Dartmouth Medical School | Medical Director, Antiaging Regenerative Medicine Clinic
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Dr. Bertica M. Rubio is a board-certified physician and Medical Director of the Antiaging Regenerative Medicine Clinic in Redlands, California. She earned her Doctor of Medicine from Dartmouth Medical School and completed her pediatrics residency at UC Irvine Medical Center.
With decades of clinical experience, she specialises in age management medicine, regenerative medicine, wound healing and growth factor therapies, and her practice integrates evidence-based medical science with advanced aesthetic treatment.
For PureLift LAB she reviews articles for medical accuracy across the whole dial, from the gentle nanocurrent and microcurrent settings through to muscle-level EMS and the Infuse pass.
Daniel Grinberg, MD, FACS
Board-Certified Otolaryngologist | Head and Neck Surgeon | Fellow, American College of Surgeons | Mount Sinai
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Daniel Grinberg, MD, FACS is a board-certified otolaryngologist and head and neck surgeon at ENT and Allergy Associates in West Nyack, New York. He earned his medical degree from Columbia University College of Physicians and Surgeons.
He completed his otolaryngology residency at New York University Medical Center, serves as Assistant Clinical Professor at Mount Sinai School of Medicine, and is a Fellow of both the American College of Surgeons and the American Academy of Otolaryngology.
For PureLift LAB he brings a wider clinical lens, connecting at-home facial stimulation from microcurrent to EMS to the anatomy underneath, with the same rigour we apply to every device specification.
Prof. Dr. med. Ivo Buschmann
Chair of Angiology, Medizinische Hochschule Brandenburg | Clinic Director, University Clinic for Angiology
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Prof. Dr. med. Ivo Buschmann is Chair of Angiology at the Medizinische Hochschule Brandenburg Theodor Fontane and Clinic Director of the University Clinic for Angiology at the Brandenburg University Hospital.
He trained at the University of Hamburg, was a Max Planck Society Fellow at the Max Planck Institute for Heart and Lung Research, and held senior consultant posts at the Charite Universitatsmedizin Berlin before his appointment as Chair in 2016.
One of Europe's leading authorities on arteriogenesis, with over 150 peer-reviewed publications and US and EU patents, he reviews for PureLift LAB how the evidence on electrical stimulation is read and where its limits lie.
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Frequency specific microcurrent is a clinical technique for pain and tissue conditions that pairs two frequencies to a target, and it is a different practice from what facial devices do with frequency.
This article explains what is actually happening, such as:
- what frequency specific microcurrent is and where it came from
- why it is practised for pain rather than for facial contour
- what a facial device means when it talks about frequency
- why a modulated signal feels different from a fixed one
- how to tell which of the two a seller is describing
and many more!
If you are here because of a search for facial devices, the short answer is that these are two different fields sharing a word.
Key Points:
Frequency specific microcurrent, usually shortened to FSM, pairs two frequencies, one nominally for a tissue and one for a condition, and is practised mainly for pain.
FSM is a clinical practice delivered by trained practitioners, not a category of facial toning device.
Facial devices use frequency in a different sense, as the pulse rate of the current, which changes how a session feels and how quickly a muscle fatigues.
A fixed frequency at a given intensity feels harsher and fatigues faster than a signal that varies.
PureLift runs PDM across 361 frequency points between 1,370 and 1,730 Hz, which is a comfort and accommodation strategy rather than an FSM claim.
What FSM is
Frequency specific microcurrent is a treatment approach developed in the clinical pain world in which two frequencies are applied together, one associated with a tissue and one with a condition, at microamp intensities.
It is practised by trained clinicians, usually for musculoskeletal pain, nerve pain and some inflammatory conditions, with protocols drawn from a body of practice rather than from a single trial.
The evidence base is thinner than its advocates suggest and less empty than its critics suggest, which is an uncomfortable position for a marketing page and an accurate one.
What matters for anyone reading this from a facial device search is that FSM is a clinical practice rather than a product category, and buying a facial device will not give you it.
Why the confusion exists
Both use the word microcurrent, both operate in microamps, and search engines cannot see the difference between a person looking for pain treatment and a person looking for a jawline.
A handful of sellers exploit the overlap, borrowing the clinical language of FSM to make a cosmetic device sound medical.
The tell is usually whether the seller can tell you which frequencies and why. An FSM practitioner will name the pairing; a cosmetic brand using the phrase decoratively usually cannot.
What frequency means on a facial device
On a facial device, frequency means the pulse rate of the current, how many pulses arrive per second, and it is a completely different concept from the paired frequencies of FSM.
Pulse rate changes what a session feels like and how the muscle responds. Low rates produce distinct individual twitches, higher rates blend into a smooth sustained contraction.
Ward and colleagues set out the thresholds separating sub-sensory, sensory and motor stimulation, and pulse rate interacts with intensity to decide which of the three you are in.
Ya-Man publishes a frequency list for the Medi Lift PLUS in its FDA filing running from 2.5 Hz to 1 kHz, and 7E's filing for the MyoLift QT gives frequencies below 1 Hz, which tells you how differently two devices in this market can be operating.
Why varying the frequency matters
A muscle stimulated at one unvarying frequency accommodates to the signal, which means the same input produces progressively less response and the session feels harsher for the same benefit.
Downey and colleagues examined modulation in stimulation and the general principle is well established in the stimulation literature: a signal that varies is tolerated better and fatigues the tissue more slowly than one that does not.
That is the reasoning behind PDM on our devices, which moves the signal across 361 frequency points between 1,370 and 1,730 Hz rather than holding one value.
It is a comfort and accommodation strategy, and we would rather describe it that way than borrow clinical language from a different field to make it sound like something else.
How to tell what you are being sold
Ask what the frequencies are and what they are for. A number with a reason is a specification, and a phrase without one is decoration.
Ask whether the claim is about pain and tissue conditions, which is FSM territory and belongs with a clinician, or about facial appearance, which is the cosmetic category.
Check the FDA indications for use, which for facial devices is typically one sentence about facial stimulation for cosmetic use, and which will not mention pain conditions at all.
Our guide to checking clearances and what they cover is the fastest way to see which field a device was actually cleared for.
If pain is what brought you here
Speak to a clinician rather than buying a cosmetic facial device, because a device cleared for facial stimulation for cosmetic use is not a pain treatment and should not be sold to you as one.
That is true of ours as much as anyone's. PureLift devices are cleared for cosmetic facial use, and we make no claim about pain conditions.
If you have an implanted electronic device, any electrical stimulation question belongs with the clinician managing it, whichever field the device comes from.
This article sits inside our full map of the category, where we set out all 33 devices we track, what each one carries and what each brand publishes: Nine Technologies on One Dial, What the Rest of the Market Actually Carries.