Frequently Asked Questions
What’s the difference between LED, microcurrent, EMS, radiofrequency, ultrasound, and galvanic technology?
Many of today’s Korean skin-care tools combine multiple technologies into a single device, but each one serves a different purpose. Here’s what to know:
- LED light therapy: This uses different wavelengths of light to target specific concerns. “Blue light is commonly used for acne-prone skin because it helps target acne-causing bacteria, while red light is generally used to calm inflammation and support mild rejuvenation,” says Dr. Yoo.
- Microcurrent: This delivers tiny electrical currents that temporarily stimulate facial muscles to create a subtle lifting and toning effect. “The results are usually modest and require consistent use,” Dr. Yoo says.
- EMS (electrical muscle stimulation): Similar to microcurrent but stronger, “EMS causes muscles to contract more noticeably,” Dr. Yoo explains. “It’s designed to stimulate facial muscles rather than directly improve skin texture or rebuild collagen.”
- Radiofrequency (RF): RF uses heat energy to warm the deeper layers of skin, with the goal of encouraging collagen production over time. “At-home RF devices, however, are much less powerful than the versions used in a dermatologist’s office,” Dr. Yoo says.
- Ultrasound: Ultrasound uses sound waves to reach deeper layers of tissue. “Professional ultrasound treatments can provide noticeable lifting effects, while at-home devices use lower energy and offer more subtle results,” says Dr. Yoo.
- Galvanic technology: This uses a low-level electrical current to help water-based serums and moisturizers absorb more effectively. “Rather than treating the skin on its own, it’s best thought of as a way to help your skin-care products work a little harder,” says Dr. Yoo.
As with any at-home beauty device, it’s important to keep expectations in check. Because they’re designed to be used safely without medical supervision, they operate at lower energy levels than professional treatments. “They’re best for maintaining results and addressing mild concerns over time—not replacing in-office procedures when you’re looking for significant lifting, resurfacing, or collagen remodeling,” says Dr. Yoo.
Are Korean skin-care devices safe for sensitive skin?
Korean beauty tools can be safe for sensitive skin, but if your skin is easily irritated, it’s worth proceeding with caution. “People with sensitive, rosacea-prone, or eczema-prone skin are more likely to experience redness, stinging, dryness, or barrier irritation from at-home devices,” says Dr. Yoo.
She recommends avoiding them altogether if you have sunburned skin, active eczema, open wounds, or immediately after in-office treatments (unless your dermatologist says otherwise). “It’s also smart to skip using them alongside potentially irritating ingredients like retinoids, exfoliating acids, scrubs, or at-home microneedling,” she says. If your skin barrier is already compromised, adding a device may only make irritation worse.
Which ingredients work best with booster devices?
Hydrating and barrier-supportive ingredients are generally the safest choices to pair with booster devices, says Dr. Yoo. She recommends formulas containing “hyaluronic acid, glycerin, ceramides, panthenol, and other gentle, soothing ingredients.” On the other hand, strong actives should be avoided unless the device instructions specifically allow them and your skin already tolerates that ingredient well.
Is there evidence that booster devices improve product penetration?
There is some scientific rationale behind booster devices, because the skin’s outermost layer is designed to act as a barrier, and certain technologies may temporarily affect how products sit on or move through the skin, says Dr. Yoo. That said, “the evidence is still limited and depends heavily on the device, the technology, and the product being used with it,” she says. For example, one small four-week study found that a medium-frequency EMS device used improved skin elasticity, sagging, and double-chin lifting compared with the skin-care product alone.
However, she notes that this doesn’t prove all booster devices meaningfully increase ingredient penetration—or that they’ll work the same way with every formula, says Dr.Yoo. She also cautions that more penetration isn’t always better: “If a device enhances the delivery of potentially irritating ingredients like retinoids or exfoliating acids, it could also increase redness, stinging, or barrier irritation,” she says. For that reason, she recommends sticking with gentle hydrators and barrier-supporting ingredients when using at-home booster devices.
Meet the experts
- Marisa Garshick, MD, a board-certified dermatologist in New York City
- Lauren L. Levy, MD, a board-certified dermatologist at Lewis Dermatology Associates based in New York City
- Jane Yoo, MD, a dual board-certified dermatologist and Mohs surgeon based in New York City
How we test and review products
When Allure tests a product, our editors look at it from every angle in an effort to best serve you. We are particularly discerning when writing about skin-care devices. This is because of the increased risks and, in many cases, the high price points that accompany at-home dermatological tools and devices.
Each device undergoes extensive testing and must be approved by a senior member of our beauty team prior to appearing in Allure. Additionally, our editorial team consults board-certified dermatologists and cosmetic chemists about the science behind product claims and independently reviews any studies cited by brands. Testers consider performance across four primary categories: efficacy, safety (including ease of use), research and the science behind specific claims, as well as product value. To learn more information on what’s involved in our reporting, check out our complete reviews process and methodology page.
Our staff and testers
A beauty product is a personal purchase. You might be searching for a face cream to address persistent dryness or a new nail product to add to your Sunday self-care routine; you may simply be browsing around for the latest launches to hit the hair market. No matter what you seek or your individual needs and concerns, Allure wants to ensure that you love anything we recommend in our stories. We believe that having a diverse team of writers and editors—in addition to the wide range of outside testers and industry experts we regularly call upon—is essential to reaching that goal.
After all, can we really say a skin-care product is the “best” for people over 50 if the only testers we’ve solicited opinions from folks who have yet to hit 30? Can we honestly deem a high-end diffuser worthy of your hard-earned cash if it’s never been tested on curls? We’re proud that our staff spans a wide range of ages, skin tones, hair textures, genders, and backgrounds, which means that we are able to fairly assess any beauty product that comes into the beauty closet.
Disclaimer : This story is auto aggregated by a computer programme and has not been created or edited by DOWNTHENEWS. Publisher: www.allure.com
