The Foreo Bear 2 and NuFace Trinity+ are the two devices that dominate every "best microcurrent device" list, every Reddit thread, and every dermatologist recommendation roundup. They're both FDA-cleared, both well-reviewed, and both genuinely effective.
They're also genuinely different. And those differences have a direct impact on the kind of conductive gel you should be using with each one. This isn't something most comparison articles cover, but it's arguably the most practical takeaway for anyone deciding between these two–or anyone who already owns one and wants to optimize their results.
The Devices: A Quick Honest Breakdown
NuFace Trinity+
The NuFace Trinity+ is the latest iteration of the device that essentially created the at-home microcurrent category. It uses two metal prongs (microcurrent spheres) that you glide across the skin in pairs, delivering current between them and through the underlying muscle tissue.
The Trinity+ features what NuFace calls "Microcurrent + Bioelectric Stimulation"–essentially their proprietary waveform that combines traditional microcurrent with additional electrical stimulation patterns. It operates at up to 400 microamps, which is notably more powerful than its predecessors.
The treatment technique involves using the two spheres together, lifting and holding at various points across the face. The device has an audible tone system that beeps when it detects adequate conductivity (or buzzes when conductivity drops). Sessions typically run 5 to 20 minutes depending on which routine you follow.
Foreo Bear 2
The Foreo Bear 2 takes a different design approach. Instead of two separate prongs, it uses a flat, T-shaped silicone body with metal contact points embedded in the surface. The device pairs with the Foreo app, which guides users through customized routines using "microcurrent and T-Sonic pulsations"–a combination of electrical stimulation and mechanical vibration.
The Bear 2 delivers up to 270 microamps and incorporates 10 adjustable microcurrent intensities. Its T-Sonic pulsations add a mechanical component that the NuFace doesn't have–essentially a vibrating massage that aids in product absorption and lymphatic drainage alongside the electrical stimulation.
Where Glide Becomes the Deciding Factor
Both devices need a conductive medium to function effectively. But the way each device interacts with that medium is noticeably different, and this affects which gel characteristics matter most.
NuFace Trinity+ and Glide
The NuFace's dual-sphere design means you're pressing two metal balls against your skin and gliding them in specific patterns. The contact points are small and concentrated, which means the pressure per square inch is relatively high. If your gel layer is too thin, those spheres will drag against the skin–pulling, tugging, and creating friction that's both uncomfortable and counterproductive (you're supposed to be lifting the skin, not dragging it downward).
The NuFace also has a tendency to "dry out" faster because of those concentrated contact points. As the spheres pass over the same area multiple times, they push the gel aside rather than gliding through it. If you started with a thin layer, you'll hit dry patches within 3 to 4 minutes and the device will start buzzing its "low conductivity" warning.
For the NuFace specifically, you need a gel with high slip and staying power–thick enough to maintain a conductive, slippery layer even after multiple passes over the same area. This is where generic aloe vera gels and thin serums tend to fail. They don't have the viscosity to stand up to the NuFace's technique.
Foreo Bear 2 and Glide
The Foreo's broader, flatter contact surface distributes pressure more evenly, which reduces the drag issue. However, the T-Sonic pulsations add a complication: the vibrating motion can cause thin gels to essentially vibrate off the skin, leaving dry patches faster than you'd expect.
The Bear 2 also has a silicone body surrounding the metal contacts. Silicone on wet skin can create a suction-like grip if the gel layer is insufficient–imagine pressing a wet silicone phone case against your cheek. That grip stops the smooth gliding motion the device relies on.
For the Foreo, you need a gel that provides a cushioned "buffer" layer–thick enough that the silicone body glides smoothly without suctioning to the skin, but not so thick that it interferes with the conductivity of the metal contact points.
The Common Ground: What Both Devices Need
Despite their design differences, both devices share the same core gel requirements.
Both need a water-based formula. This is the baseline for conductivity with any microcurrent device. Oil-based products, heavy silicone serums, and occlusive creams will all impede electrical current flow.
Both benefit from a gel with moderate-to-high viscosity. Thin, watery serums run off the face too quickly and don't provide sustained glide. A gel or serum with body–something that stays where you put it–maintains conductivity longer and reduces the need for constant reapplication.
Both perform better when the conductive medium doubles as skincare. Since both devices enhance ingredient absorption (the NuFace through iontophoresis, the Foreo through T-Sonic pulsation-assisted absorption), whatever's in your gel is getting pushed into your skin. A gel with hyaluronic acid, hydrolyzed collagen, or peptides turns every session into a treatment. A basic conductive gel with water and thickener is a missed opportunity.
And both benefit from a leave-on formula. Neither device works well when you're rushing to rinse sticky residue off your face. A conductive serum that absorbs cleanly post-treatment integrates seamlessly into your skincare routine regardless of which device you're using.
Real-World Performance Comparison
Let's get specific about how the two devices feel during use and how gel choice impacts the experience.
With the NuFace Trinity+, using a thin gel (or one that dries quickly), you'll notice the conductivity warning buzzing within 2 to 3 minutes on most areas. The spheres start to skip and drag, which is especially noticeable along the jawline and cheekbones where the skin is taut over bone. The solution is either constant reapplication (annoying and wasteful) or starting with a thicker, more resilient gel that maintains its layer for the full session.
With the Foreo Bear 2, thin gels tend to cause the silicone body to grip rather than glide, creating a stop-and-start motion that disrupts the treatment flow. The T-Sonic pulsations can make the gel layer feel like it's thinning faster than it actually is, especially on the forehead and temples where the skin surface is relatively flat.
Both devices perform dramatically better–smoother glide, consistent conductivity, more comfortable sessions, better results–with a gel that's specifically formulated for sustained microcurrent use rather than repurposed from another skincare category.
The Case for a Universal Conductive Serum
Here's the practical reality: many serious skincare enthusiasts own more than one device, or they upgrade devices over time. Using a different gel for each device is impractical and expensive. What you really want is one conductive serum that works optimally across all your tools.
Absonic Glow was formulated to be device-agnostic. The viscosity is calibrated for that sweet spot–thick enough to maintain a sustained conductive layer under the NuFace's concentrated sphere pressure, cushioned enough to prevent the Foreo's silicone grip, and smooth enough to glide with either design. It works equally well with Medicube, ZIIP, MyoLift, and other microcurrent devices because the conductive properties are universal.
The 8-ounce format matters here too. If you're using your device daily (as both NuFace and Foreo recommend for optimal results), and you're applying generously enough to maintain proper conductivity throughout your session, you're going through product. The larger format means you're not making a separate gel purchase every two weeks.
Which Device Should You Choose?
Both the Foreo Bear 2 and NuFace Trinity+ are capable devices backed by real technology and clinical evidence. Your choice between them should come down to preference.
Choose the NuFace Trinity+ if you want more power (400 vs. 270 microamps), prefer a more hands-on technique with targeted lift-and-hold motions, or want a device with a long track record and a huge library of tutorials and routines available online.
Choose the Foreo Bear 2 if you prefer app-guided routines (the Foreo app walks you through each step), want the added benefit of T-Sonic pulsation for product absorption and massage, or prefer a smaller, travel-friendly design with a broader contact surface.
Whichever device you choose, the gel underneath it will have more impact on your daily experience than most people realize. A great gel turns a good device into an exceptional routine. A subpar gel turns any device into a frustrating chore.
Invest in the device that fits your lifestyle. Then invest equally in the conductive serum that makes it actually enjoyable to use.
