Healthy-looking skin begins with skin barrier health. At Ulike’s Future Beauty, Powered by Light event in Boston, Harvard dermatologist and skin biologist Dr. Anna Mandinova explained why beauty technology should account for the skin’s protective barrier, cellular renewal, energy use, and response to temperature.
Her keynote, “Be Gentle to Your Skin: The Science of Resilience,” approached beauty through biology. Skin is a living organ that continually protects, renews, and adapts. Understanding those functions helps consumers ask better questions about products and helps designers build technologies that work more thoughtfully with the body.
What to Know About Skin Resilience
- The skin barrier limits water loss and helps protect the body from environmental stressors and microorganisms.
- Healthy skin depends on continuous cell renewal, differentiation, and energy metabolism.
- Temperature can affect cellular behavior, but the response depends on the intensity, duration, and experimental context.
- Cooling can help manage heat and comfort during a skin-contact treatment; colder is not automatically better.
- Beauty technology should consider skin barrier function and thermal stress alongside visible results.
Meet Dr Anna Mandinova
Dr. Anna Mandinova is an associate professor of dermatology at Harvard Medical School and an investigator at the Mass General Research Institute. Her research examines the cellular signaling systems that regulate keratinocytes, cell survival, proliferation, and skin disease.
At the Boston event, Mandinova connected that research perspective to a practical idea: appearance reflects the health and function of the organ beneath it.
“When looking at the aesthetics of your skin and your appearance, what we skin biologists want to do is to understand that this is a reflection of the health of this organ which protects you from everything around you.”
What Skin Barrier Health Means
The skin is the body’s largest organ and its first line of defense. Its outermost layer, the stratum corneum, provides much of the skin’s permeability barrier. It helps limit water loss while reducing exposure to irritants, harmful substances, and microorganisms.
Skin barrier function depends on the organized structure of corneocytes and intercellular lipids, including ceramides, cholesterol, and fatty acids. Hydration, environmental exposure, age, body site, and skin condition can all affect how well this barrier performs.
Texture, firmness, brightness, and smoothness are visible qualities, but they are only part of the picture. Resilient skin also needs to maintain its barrier, replace cells, repair damage, and respond to changes in its environment.
How Skin Cells Renew and Use Energy
Skin cell renewal is an active biological process. Cells divide, differentiate, move through the epidermis, and eventually form the outer protective layer. Each stage depends on coordinated signaling and energy metabolism.
Mandinova emphasized that mitochondria do more than supply energy. They help connect cellular decisions with metabolic activity. Fatty-acid metabolism also supplies energy and molecular building blocks that cells use to maintain and renew tissue.
“What you see in the mirror changes all the time. Every four weeks of your adult life you’re getting a brand-new cover of your skin.”
The exact pace of epidermal turnover varies with age, body site, health, and other factors. The larger point remains: healthy skin is maintained by ongoing biological work, not by a single “miracle” ingredient or device.
Cooling Skin and Managing Thermal Stress
Skin continually responds to temperature. During treatments that deliver thermal energy, controlled contact cooling can help manage the temperature at the skin’s surface and improve comfort. This is relevant to at-home IPL hair removal, where light energy produces heat in the treatment area.
Cooling should be treated as a controlled design variable, not a claim that more cold is always beneficial. The skin’s response depends on temperature, exposure time, tissue condition, and the technology being used. Cooling can also change how heat and discomfort are perceived, as discussed in our companion article on how the body senses touch, temperature, and pain.
Ulike’s Sapphire Cooling Technology is designed to keep the treatment window cool while delivering IPL pulses. From a skin-conscious design perspective, that approach addresses both energy delivery and the sensory experience at the point of contact.
Temperature and the Cellular Clock
Mandinova also discussed research on cold exposure and cellular timekeeping. Laboratory studies show that substantial cooling can alter chromatin organization and the handling of messenger RNA involved in the circadian clock. Rewarming can then trigger molecular changes that reset cellular rhythms.
These findings are scientifically interesting, but they require context. The published experiments used controlled laboratory conditions, including temperatures far below normal skin temperature. They do not show that everyday cooling devices “reset” skin or provide a consumer anti-aging treatment.
What the research does show is that temperature is biologically meaningful. Cells detect thermal conditions and can adjust gene activity and timing in response.
Designing Beauty Technology Around the Skin
If skin is a living, adaptive organ, beauty technology has to account for more than a visible result. Energy delivery, contact temperature, pressure, treatment timing, and recovery all form part of the biological context in which a device operates.
A skin-conscious approach asks practical questions: How much energy reaches the skin? How is heat managed? Does the treatment preserve comfort? Are the instructions appropriate for different skin conditions and users? These questions help turn “gentle” from a marketing description into a design requirement.
Healthy Skin Is the Foundation of Beauty
For Mandinova, aesthetics and health are closely connected. Skin protects the body, maintains its internal environment, renews itself, and responds to the world around it. Supporting those functions is central to skin barrier health.
“My goal is to understand how this organ works and how we can support it not only to look good but to function as it needs.”
The future of beauty technology should therefore be judged by two questions: what does it achieve, and how thoughtfully does it work with the biology of the skin?
