What Makes a Serum Conductive, and How to Test the One You Own
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
Read bio
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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A conductive layer needs to be water-based and stay wet for the whole session, and most hydrating serums already on your shelf qualify.
This article explains what is actually happening, such as:
- why current needs water rather than a branded formula
- the ingredients that stop a serum conducting
- a two-minute test you can run on any bottle
- how much to use and when to reapply
- what a sharp or patchy sensation is telling you
and many more!
Nothing here requires you to buy anything from us, which is rather the point.
Key Points:
Current travels through water and the salts dissolved in it, so a water-based serum conducts and an oil or silicone does not.
Look at the first three ingredients: if water or aqua is first and there is no heavy oil or dimethicone near the top, it will almost certainly work.
Hyaluronic acid, glycerin and aloe-based hydrating serums are the reliable category, and the price of the bottle has nothing to do with it.
A session that feels sharp in one spot usually means the layer has dried there, not that the level is too high.
PureLift works with any water-based serum you already own; several competitors require their own gel at $24 to $80 a bottle.
What the current actually needs
Electrical current moves through the skin by way of the water and dissolved salts in and on it, so the job of the layer between the probe and your face is to be wet and to stay wet.
A dry contact resists the current, which concentrates it at whatever small area does conduct, and that is what people experience as a sting.
The layer also has a mechanical job, letting the probe glide rather than drag, since dragging pulls at the skin and makes people press harder than they should.
Neither job requires a proprietary formula, which is why our devices are specified to work with any water-based serum.
Read the first three ingredients
If water or aqua is the first ingredient, you are most of the way there.
Humectants such as glycerin, hyaluronic acid or sodium hyaluronate, panthenol and aloe all hold water at the surface, which is exactly what you want.
What stops a serum conducting is anything that forms a barrier: facial oils, squalane-heavy formulas, balms, and silicones such as dimethicone or cyclopentasiloxane high in the list.
Thick creams are a grey area, because many are water-based underneath but too occlusive to conduct evenly.
Alcohol-heavy toners evaporate too fast to last a session even though they conduct while wet.
The two-minute test
Apply your serum as you normally would to one cheek, a visible layer rather than a thin smear.
Start the device at a low level and run your usual pass, watching for two things: whether the probe glides without dragging, and whether the sensation stays even across the whole area.
Then wait two minutes without reapplying and run the same pass again.
If it still glides and still feels even, the serum holds long enough for a full session. If it turns sticky or sharp, it is drying too fast and you need more of it or a mist alongside.
Compare against a plain hyaluronic serum if you want a reference point, since that is roughly the behaviour any conductive gel is engineered to produce.
How much, and when to reapply
More than feels natural for skincare, because you are laying down a working layer rather than absorbing a treatment.
The skin should look wet for the whole three minutes on each side, not dewy.
If you are treating a larger area or the room is dry, reapply between sides rather than pushing through a drying layer.
A facial mist over the top is a legitimate way to extend a serum that would otherwise be fine.
What the sensations mean
An even, firm pulling sensation across the area is the device working as intended.
A sharp point in one spot is almost always a dry patch or a bony area with thin coverage, and the fix is more serum rather than a lower level.
A metallic taste near the jaw is ordinary at higher levels and not a fault.
Pain is never correct, and it means stop, add serum, and start again lower.
The money question
NuFACE gel runs $35 to $80 a bottle and its FDA file lists a conductive gel primer as a special requirement, ZIIP gels run $29.99 to $79.99, FOREO's conductor is $41.90, Therabody's is $29.99, Skin Gym's is $24 and 7E's ReStore is $27 for four ounces.
Some of those are genuinely well formulated and none of them is doing physics a plain hydrating serum cannot do.
We sell an Activator Serum and we tell you plainly that it is one option rather than a requirement, because a device that only works with its own bottle is a subscription with a handle attached.
We have set out the two-year arithmetic separately, and on a cheaper device with a required gel it can close most of a $300 price gap.
This comparison 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.
Product formulations and prices checked on 21 September 2026 against each brand's own published material.